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Wyszukujesz frazę "ontogenesis." wg kryterium: Temat


Tytuł:
Zmiany tempa rozwoju w ontogenezie człowieka i metody jego badania
Changes in the growth rate during ontogenesis and methods of its investigation
Autorzy:
Siniarska, Anna
Wolański, Napoleon
Powiązania:
https://bibliotekanauki.pl/articles/1817717.pdf
Data publikacji:
2005-12-31
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
antropologia
ortogeneza
człowiek
anthropology
ontogenesis
human
Opis:
The problem of acceleration of growing processes during childhood and adolescence has been considered for a long time. The observations on this subject date back to the 19th century, however the attempts to summarize this phenomenon were dated to the 20th century. At the beginning of the 20th century Stratz, distinguishing the period of early and late childhood, had mentioned about three periods of deceleration and two periods of acceleration of growing processes. In 1930 also Boas identified the pubertal spurt. Ones of the first longitudinal studies had been organized in Krakow by Talko-Hryncewicz and continued in 1919-32. The results had been elaborated by Jasicki in 1934-48 and he revealed that there are two periods of acceleration of growing processes.In Poland this acceleration in growth had been called “the maximal height velocity.” The growth spurt at the end of childhood (around 7 years) has been pointed out by many authors in the 1930s, and in 1947 Tanner called it the mid-growth spurt. In 1961 Wolański pointed out that there are several growth spurts in childhood and called them pre (school) spurts. Consequently, in 1962 he had distinguished pubertal spurts for many somatic characteristics, and in 1964 – at least two pubertal spurts in height. Wolański had been analyzing the age at pubertal spurt followed by the age at menarche in rural and urban girls and concluded that these events are further apart if the pubertal spurt occurs later. The further analysis of these phenomena had been postponed because of the unfortunate statistical methods which presented data as mathematically smoothed growth curves and many details of individual growth patterns have been eliminated.Only two last decades the daily and monthly studies of growth processes have returned to favor, and the relationship between the rate and age at prepubertal and pubertal spurts has been studied again. In about 1980 the growth spurt at the turn of childhood and juvenile periods was again under study, but only during the last decade several growth spurts have been manifested. The number of prepubertal growth spurts has a very important impact on age and velocity of the pubertal spurt. If the number of prepubertal spurs is grater, the pubertal spurt occurs later and is less manifested. There are still many controversies according to the age of pubertal spurt and final body height. It may be similar to the relationship between menarche and final body height. It is observed that between populations there is a negative correlation between age at menarche and adult height, whereas between women within the population this correlation is positive (Wolański 1979).
Źródło:
Studia Ecologiae et Bioethicae; 2005, 3, 1; 43-81
1733-1218
Pojawia się w:
Studia Ecologiae et Bioethicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of Sports Career Development in the 400-metre Dash
Autorzy:
Pietrzak, Michał
Iskra, Janusz
Dziadek, Bartosz
Gwiazdoń, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2159494.pdf
Data publikacji:
2021-12-31
Wydawca:
Politechnika Opolska. Wydział Wychowania Fizycznego i Fizjoterapii
Tematy:
400m
ontogenesis
sports career development
Opis:
One of the indicators of an optimally conducted training process is the athlete's achievement of sports success in all age categories. The analysis of sports career development is helpful in determining the periods of maximizing and maintaining sports results, but also in choosing the development path leading to the achievement of top-level results at the senior age. The aim of the study was to assess the development of sports championship in the 400-metre dash, comprising sports careers of 400 m medalists of the World Cadet and Junior Championships and European Junior Championships in the most important sports events in the senior age category, namely the European Championships, World Athletics Indoor Championships, World Championships, and the Olympic Games. The analysis involved a group of 69 male and 69 female medalists of the European Junior Championships, 27 male and 27 female medalists of the World Youth Junior Championships as well as a group of 48 male and 48 female medalists of the World Junior Championships in the 400 m. The research revealed that from 4% to 7% of the World Cadet Championships medalists and 1-3% of the male and 4-6% of the female medalists of the European Junior Championships achieved their highest sports success by winning medals at the World Championships and the Olympic Games. 6% to 10% of the studied World Junior Championships male medalists were successful in the World Championships. Among the World Championships female medalists, 12% won medals at the World Athletics Indoor Championships, 6% won medals at the World Championships, and 2% won the Olympic Games medals.
Źródło:
Journal of Physical Education & Health - Social Perspective; 2021, 10, 18; 43-51
2084-7971
Pojawia się w:
Journal of Physical Education & Health - Social Perspective
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zaktualizowana chronologia i metryka poziomowej periodyzacji ontogenezy
Updated chronology and metrics in multi-level periodization of ontogenesis
Autorzy:
Karandashev, Yuri
Powiązania:
https://bibliotekanauki.pl/articles/514195.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ontogeneza
chronologia ontogenezy
metryka ontogenezy
periodyzacja rozwoju
poziomowa periodyzacja ontogenezy
ewolucyjna koncepcja ontogenezy
ontogenesis
chronology of ontogenesis
metrics of ontogenesis
way of dividing of life
into periods
periodization of ontogenesis
multi-level periodization of development
evolutionary
theory of development
Opis:
Centralnym zagadnieniem psychologii rozwoju, jak również i całej psychologii, jest periodyzacja ontogenezy. Nie tylko podział życia na poszczególne okresy, lecz także utworzenie teorii, która by wyjaśniała, dlaczego życie indywidualne dzieli się na okresy w pewien sposób. Tylko mając podobną teorię, można stawiać pytania dotyczące długości okresów rozwojowych i ich granic. Rozwiązaniu tego drugiego zadania poświęcony jest ten artykuł.
The central problem of development psychology, and psychology in general, is a way of dividing of life into periods called in European tradition as a periodization of ontogenesis. Nor just the division of life into separate periods, but the creation of a theory that would explain why the individual life is divided into periods in a certain way. Only with such a theory, it is possible to wonder about the age periods and the duration of their borders. The solution of second problem appears as an objective of this article.
Źródło:
Psychologiczne Zeszyty Naukowe; 2018, 1; 65-92
2451-1420
Pojawia się w:
Psychologiczne Zeszyty Naukowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chronologia i metryka rozwoju ontogenetycznego
Chronology and metrics of ontogenetic development
Autorzy:
Karandashev, Yuri
Powiązania:
https://bibliotekanauki.pl/articles/514280.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ontogeneza
chronologia ontogenezy
metryka ontogenezy
periodyzacja rozwoju
poziomowa periodyzacja ontogenezy
ewolucyjna koncepcja ontogenezy
ontogenesis
chronology of ontogenesis
metrics of ontogenesis
way of dividing of life into periods
periodization of ontogenesis
multi-level periodization of development
evolutionary theory of development
Opis:
Centralnym zagadnieniem psychologii rozwoju, jak również i całej psychologii, jest periodyzacja ontogenezy. Nie tylko podział życia na poszczególne okresy, a utworzenie teorii, która by wyjaśniała, dlaczego życie indywidualne dzieli się na okresy w pewien sposób. Tylko mając podobną teorię, można stawiać pytania dotyczące długości okresów rozwojowych i ich granic. Rozwiązaniu tego drugiego zadania poświęcony jest ten artykuł.
The central problem of development psychology, and psychology in general, is a way of dividing of life into periods called in European tradition as a periodization of ontogenesis. Nor just the division of life into separate periods, but the creation of a theory that would explain why the individual life is divided into periods in a certain way. Only with such a theory, it is possible to wonder about the age periods and the duration of their borders. The solution of second problem appears as an objective of this article
Źródło:
Psychologiczne Zeszyty Naukowe; 2016, 1; 101-124
2451-1420
Pojawia się w:
Psychologiczne Zeszyty Naukowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ujednolicona chronologia i metryka rozwoju ontogenetycznego
Unified chronology and metrics of ontogenetic development
Autorzy:
Karandashev, Yuri
Powiązania:
https://bibliotekanauki.pl/articles/1387884.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ontogeneza
chronologia ontogenezy
metryka ontogenezy
periodyzacja rozwoju
poziomowa periodyzacja ontogenezy
ewolucyjna koncepcja ontogenezy
ontogenesis
chronology of ontogenesis
metrics of ontogenesis
way of dividing of life into periods
periodization of ontogenesis
multi-level periodization of development
evolutionary theory of development.
Opis:
Centralnym zagadnieniem psychologii rozwoju, jak również i całej psychologii, jest periodyzacja ontogenezy. Nie tylko podział życia na poszczególne okresy, ale utworzenie teorii, która by wyjaśniała, dlaczego życie indywidualne dzieli się na okresy w pewien sposób. Tylko mając podobną teorię, można stawiać pytania dotyczące długości okresów rozwojowych i ich granic. Rozwiązaniu tego drugiego zadania jest poświęcony ten artykuł.
The central problem of development psychology, and psychology in general, is a way of dividing of life into periods called in european tradition as a periodization of ontogenesis. Nor just the division of life into separate periods, but the creation of a theory that would explain why the individual life is divided into periods in a certain way. Only with such a theory, it is possible to wonder about the age periods and the duration of their borders. The solution of second problem appears as an objective of this article.
Źródło:
Psychologiczne Zeszyty Naukowe; 2017, 2; 11-134
2451-1420
Pojawia się w:
Psychologiczne Zeszyty Naukowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality of life and physical activity of kindergarden teachers
Autorzy:
Brodáni, Jaroslav
Žišková, Ivana
Powiązania:
https://bibliotekanauki.pl/articles/1031773.pdf
Data publikacji:
2015
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
activity
age
kindergarden
life quality
ontogenesis
relations
teachers
Opis:
The contribution presents the relationship between the frequency of physical activity during the week and fields of life quality of kindergarden teachers in three mature parts. In the research took part kindergarden teachers from Slovakia (n = 211) who were divided into groups according to their ontogenesis. The life quality was observed with a modified questionnaire SQUALA and the physical activity level frequency during the week. The data is presented by descriptive characteristics (n, M, SD) and statistic importance of differences, let us say relationships which are measured by non-parametric methods (W, U, rs), by the importance level (p<0.05; p<0.10). The results showed the most numerous correlations between the physical activity during the week and fields of life quality of teachers in age group from 36-46 years (middle mature) who do the physical activity M: 3.250 during the week by SD: 2.761. In this group were proved positive correlations with the field of physical well-being (p<0.01), psychosocial well-being (p<0.01), material well-being (p<0.01), education (p<0.10), free time (p<0.05), appearance and property of things (p<0.01). Specially this age is characteristic by reaching the highest goals of physical and mental performance. In the groups of younger and older mature we do not find so many important relationships between the physical activity and some fields of life quality. In these groups we did not find any important correlations of physical activity with physical well-being where the group of young mature reached the same level of physical activity as the group of middle mature. The conclusions show the importance of physical activity in life of kindergarden teachers, they show some possibilities of influencing the life quality through the physical activities but also creating the optimal conditions possibilities to increase the life quality in social environment. The contribution is part of the Ministry of Education grant KEGA 014UKF-4/2013 Improving the quality and level of health of adolescents by means of physical activity in primary and secondary schools.
Źródło:
Physical Activity Review; 2015, 3; 11-21
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE DEVELOPMENT OF RESULTS IN 100M AND 400M SPRINT RACES IN ATHLETES AGED FROM 6 TO 100
Autorzy:
Iskra, Janusz
Pietrzak, Michał
Szczęsna, Monika
Gwiazdoń, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/449251.pdf
Data publikacji:
2017
Wydawca:
Politechnika Opolska. Wydział Wychowania Fizycznego i Fizjoterapii
Tematy:
100m
400m
ontogenesis
sports career development
Opis:
The 100 m race is not only a sports discipline but also a way of assessing an athlete’s speed abilities. The run over the distance of 400 metres combines both speed and endurance (anaerobic) capacities. The purpose of the study was to evaluate the development of results in men's 100 and 400m sprint races, taking into account the best performance within the age from 6 to 100. By examining the course and the development of the world's leading sprinters’ careers, the authors took into consideration their best final results achieved each year. They were assigned to three research protocols that included age, successive years of starts, and the period before and after their personal best.The results are presented with arithmetic means and standard deviations (SD). In the comparative analysis of groups of runners over various distances (100 and 400m), the percentage value (%) of the result in relation to the world record over the given distance was chosen as a common element. The research has shown that the age range from 20 to 31 in the 100m race and 20 to 29 in the 400m run respectively, are the best periods for continuation of a sports career suitable for the shortest and longest sprint distance at the highest world level. The development of speed abilities up to the age of 14 is similar to the scale of their regression after the age of 35. Knowledge concerning the change in sports performance level in relation to age provides the opportunity to predict the periods of peak performance in a given sports discipline. This enables a rational and proper planning of the training process.
Źródło:
Journal of Physical Education & Health - Social Perspective; 2017, 6, 9; 27-38
2084-7971
Pojawia się w:
Journal of Physical Education & Health - Social Perspective
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploring the limits of morphospace: ontogeny and ecology of Late Visean ammonoids from the Tafilalt, Morocco
Autorzy:
Klug, C.
De Baets, K.
Korn, D.
Powiązania:
https://bibliotekanauki.pl/articles/22457.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleoecology
morphospace
ontogenesis
ecology
Late Visean
ammonoid
Ammonoidea
Morocco
Opis:
Early late Viséan ammonoid assemblages in Morocco are composed of diverse and well-preserved specimens. The material was found in a plain in the Tafilalt (eastern Anti-Atlas). Here, we describe mass-occurrences of juvenile specimens, in which subadult and adult specimens occur in low numbers. The juveniles of some species display a conch morphology that differs fundamentally from the adult stages. Accordingly, we emend the species diagnoses of Goniatites lazarus as well as Calygirtyoceras darkaouaense, introduce the species Entogonites bucheri sp. nov., and discuss possible ecological implications of the morphologic changes throughout ontogeny. In particular, we compare the changes in conch morphology through ontogeny in the light of Pareto Optimiality according to which the morphology of organisms would fill a polygon or polyhedron in morphospace. Data points in one of the vorteces of the polyhedron indicate optimisation for the corresponding task. Although shape is not a proof of function, it appears plausible that juvenile conchs were selected rather for compactness while adult conchs were positively selected for conchs with improved hydrodynamic properties. This appears plausible because at small conch diameters, swimming movements will not suffice for effective translocation and a planktonic mode of life is likely.
Źródło:
Acta Palaeontologica Polonica; 2016, 61, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Die Grenzen der Erkenntnis in der Linguistik: Ontogenese und Phylogenese
Autorzy:
Kotin, Michail L.
Powiązania:
https://bibliotekanauki.pl/articles/458715.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Wrocławski. Oficyna Wydawnicza ATUT – Wrocławskie Wydawnictwo Oświatowe
Tematy:
language origins
language change
phylogenesis
ontogenesis.
Sprachursprung
Sprachwandel
Phylogenese
Ontogenese
Opis:
Limits of Knowledge in Linguistics: Ontogenesis and Phylogenesis The limits of knowledge in the analysis of natural human languages are due to both properties of language systems as subject of analysis and properties of the human awareness as instrument of cognition. Though the human awareness can follow its own activities by conceptualizing them in symbolic forms, the pre-phase of linguistic competence cannot be reconstructed. The second problem is connected with the time factor, i.e. the compulsive and decisive influence of time which enforces language change independently of partial causes of concrete language change in question.
Die Erkenntnisgrenzen bei der Analyse natürlicher Sprachen ergeben sich sowohl aus den Eigenschaften der Sprachsysteme als Forschungsgegenstand als auch aus den Eigenschaften des menschlichen Bewusstseins als Erkenntniswerkzeug. Obwohl das menschliche Bewusstsein seine eigene Tätigkeit mittels ihrer Konzeptualisierung in symbolischen Formen verfolgen kann, entzieht sich die Vorphase linguistischer Kompetenz gänzlich einer angemessenen Rekonstruktion. Ein weiteres Problem hängt mit dem Zeitfaktor zusammen, d. h. dem unveräußerlichen und entscheidenden Einfluss der Zeit, welcher den Sprachwandel unabhängig von seinen partiellen Ursachen in einer gegebenen Sprache verursacht.
Źródło:
Linguistische Treffen in Wrocław; 2018, 14; 17-28
2084-3062
2657-5647
Pojawia się w:
Linguistische Treffen in Wrocław
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany inwolucyjne ciśnienia tętniczego krwi oraz tętna u kobiet i mężczyzn w wieku 21-60 lat w aspekcie prozdrowotnym
Health aspects of involutionary changes of blood pressure and heart rate of women and men between 21-60 years of age
Autorzy:
Żychowska, Małgorzata
Gawinek, Marian
Nowak, Monika
Żak, Michał
Powiązania:
https://bibliotekanauki.pl/articles/415774.pdf
Data publikacji:
2009-12
Wydawca:
Małopolska Wyższa Szkoła Ekonomiczna w Tarnowie
Tematy:
inwolucja
nadciśnienie
zróżnicowanie międzypłciowe
ontogeneza
involution
hypertension
sexual balance
ontogenesis
Opis:
Cel pracy: Podjęte badania miały na celu określić zmiany ontogenetyczne dorosłych kobiet i mężczyzn ciśnienia krwi i tętna w populacji o niskim statusie społeczno-ekonomicznym. Materiał i metody: W pracy wykorzystano wyniki badań 142 kobiet i 97 mężczyzn, mieszkańców południowej Lubelszczyzny. Badanych podzielono na grupy wiekowe, 21-30, 31-40, 41-50 oraz 51-60 lat. Wykonano następujące pomiary: ciśnienia tętniczego krwi oraz tętna. Wyniki poddano analizie statystycznej, obliczono wartości średnie i odchylenia standardowe dla każdej z grup wiekowych oraz wskaźnik dymorfizmu (WD). Wyniki i wnioski: Uzyskane wyniki wskazują na niepokojące zmiany nadciśnieniowe u mężczyzn w całym badanym okresie ontogenezy. U kobiet zaobserwowano bardziej regularny przyrost ciśnienia tętniczego z wiekiem; zmiany chorobowe pojawiają się dopiero w najstarszej z grup wiekowych. Nie stwierdzono nietypowych zmian w częstości skurczów serca. Zróżnicowanie międzypłciowe w badanej populacji względem ciśnienia tętniczego malało z wiekiem badanych.
Aim of work: The aim of this experiment was to determine ontogenetic changes of adult women's and men's blood pressure and heart rate within the population with low SES. Material and methods: our work made use of examination results of 142 women and 97 men ― habitants of southern Lublin Voivodeship. The examined were divided into 3 age group: 21-30, 31-40, 41-50 and 51-60. We measured pressure and heart rate. Our results were subject to the statistic analysis, average values and those of the standard deviation were calculated for all the age groups, as well as the dimorphism index. Results and conclusion: the results of the experiment indicate worrying changes in blood pressure in men independently of the age group. We recorded a more regular increase in women's blood pressure and pathological changes appear only in the oldest age group. Non-standard changes in hearth rate were not found. WD index of blood pressure diminished along with age of the examined.
Źródło:
Zeszyty Naukowe Małopolskiej Wyższej Szkoły Ekonomicznej w Tarnowie; 2009, 3(14); 231-244
1506-2635
Pojawia się w:
Zeszyty Naukowe Małopolskiej Wyższej Szkoły Ekonomicznej w Tarnowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phyllotactic pattern formation in early stages of cactus ontogeny
Autorzy:
Gola, E M
Powiązania:
https://bibliotekanauki.pl/articles/59078.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
phyllotactic transformation
pattern formation
early stage
cactus
Cactaceae
ontogenesis
phyllotaxis
Opis:
Representatives of the family Cactaceae are characterized by a wide range of phyllotaxis. To assess the origin of this diversity, early stages of phyllotactic pattern formation were examined in seedlings. The analysis of the sequence of areole initiation revealed intertribal differences. In seedlings from the Trichocereeae (Gymnocalycium, Rebutia) and Notocacteae (Parodia) tribes, two opposite cotyledonal areoles developed as the first elements of a pattern. Usually, next pair of areoles was initiated perpendicularly to cotyledonal areoles, starting the decussate pattern. This pattern was subsequently transformed into bijugate or into simple spiral phyllotaxis. In seedlings from the Cacteae tribe (Mammillaria and Thelocactus), cotyledonal areoles were never observed and the first areoles always appeared in the space between cotyledons. It was either areole pair (mainly in Mammillaria), starting a decussate pattern, or a single areole (mainly in Thelocactus) quickly followed by areoles spirally arranged, usually in accordance with the main Fibonacci phyllotaxis. Differences in the initial stages of pattern formation do not fully explain the phyllotaxis diversity in mature cacti. Only two, the most common phyllotactic patterns occurred in the early development of studied seedlings, i.e. the main Fibonacci and the decussate pattern. Discrepancy in the range of phyllotactic spectra in seedlings and in mature plants suggests that phyllotaxis diversity emerges during further plant growth. Initial phyllotactic transformations, occurring already in the very early stages, indicate great plasticity of cactus growth and seem to support the hypothesis of the ontogenetic increase of phyllotaxis diversity due to transformations.
Źródło:
Acta Societatis Botanicorum Poloniae; 2006, 75, 4; 271-279
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The origin of ammonoid locomotion
Autorzy:
Klug, C
Korn, D.
Powiązania:
https://bibliotekanauki.pl/articles/21156.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
phylogenesis
Bactritida
ontogenesis
Ammonoidea
conch
coiling
Devonian
paleontology
locomotion
ammonoid
Opis:
Evolution of the coiled ammonoid conch from the uncoiled bactritid conch was probably coupled with changes in manoeuvrability and swimming velocity. The gradual transformation of uncoiled to coiled ammonoid conchs has essential functional consequences. The radical change in conch geometry during phylogeny but also in ontogeny of early ammonoids implies a shift of the aperture from an original roughly downward, via a downward oblique and an upward oblique to an upward orientation, presuming a neutrally buoyant condition of the ammonoid animal. Similar trends were reconstructed for the three main ammonoid lineages in the Middle Devonian, the agoniatitid, the anarcestid, and the tornoceratid lineages. This allowed an increase in manoeuvrability and in the maximum horizontal swimming speed.
Źródło:
Acta Palaeontologica Polonica; 2004, 49, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Early Cambrian [Botomian] stem group brachiopod Mickwitzia from Northeast Greenland
Autorzy:
Skovsted, C B
Holmer, L.E.
Powiązania:
https://bibliotekanauki.pl/articles/22580.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
ontogenesis
brachiopod
shell structure
Greenland
Cambrian
Mickwitzia
Brachiopoda
paleontology
Botomian
Opis:
The problematic brachiopod Mickwitzia Schmidt, 1888 is re−described based on new material of M. cf. occidens Walcott, 1908 from the Early Cambrian (Botomian) Bastion and Ella Island formations of Northeast Greenland. Etched material demonstrates that Mickwitzia has a lingulid−like juvenile (“larval”) shell with trails of nick−points, reflecting the movement of marginal setae. Juvenile and early mature ventral valves have a lingulid−like pseudointerarea with a pedicle groove. The shell of M. cf. occidens is only partially phosphatic, in particular around the juvenile–early mature shell in both valves. The phosphatic shell includes at least two types of cylindrical structures: (1) slender columns identical with the columns of acrotretoid brachiopods and (2) relatively thicker tubes which may be open to the exterior surface and have internal striations (on the ventral pseudointerarea). The striations are most likely imprints of microvilli and these tubes can be inferred to have contained setae. The thinner linguliform columns and thicker setigerous striated tubes are considered to be homologous with identical structures in the sellate and mitral sclerites of the problematic Micrina, which has been identified as a probable primitive stem group of the Brachiopoda. Mickwitzia represents a more derived member of the stem group Brachiopoda.
Źródło:
Acta Palaeontologica Polonica; 2003, 48, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Givetian (Middle Devonian) sharks from Cairo, New York (USA): Evidence of early cosmopolitanism
Autorzy:
Potvin-Leduc, D.
Cloutier, R.
Landing, E.
Hernick, L.V.
Mannolini, F.
Powiązania:
https://bibliotekanauki.pl/articles/945591.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Chondrichthyes
Elasmobranchii
Antarctilamnidae
Omalodontiformes
taxonomy
ontogenesis
paleobiogeography
Devonian
North America
Opis:
Whereas cosmopolitan distribution patterns are established for many Late Devonian vertebrates (e.g., placoderms, onychodontiforms), few palaeobiogeographic studies have considered chondrichthyans. Recent discoveries of shark material demonstrate that some chondrichthyans were cosmopolitan by the Middle Devonian. Abundant Givetian microremains have been recovered from the Cairo quarry in eastern New York State, USA. These include teeth of two shark species with Gondwanan affinities, the omalodontid Portalodus mannoliniae sp. nov. and the antarctilamnid Wellerodus priscus. Abundant teeth of P. mannoliniae sp. nov. are characterized by a smooth diplodont crown, polarized cusps, and a labially oriented base. The teeth demonstrate monognathic heterodonty. The juvenile morph is distinguished from the adult by smaller size, slender cusps, and variation in the shape of the base. W. priscus is represented by rare juvenile teeth. Two groups of scales that show affinity to material from northern (Spain) and East Gondwana (Antarctica) are tentatively attributed to the two described species. Antarctilamnid distribution suggests a north Gondwanan origin and a colonization of the margin of the landmass before dispersing to Laurentia by the Middle Devonian. This material further indicates that vertebrate global dispersal was initiated by the Middle Devonian, and emphasizes earlier palaeogeographic interpretations that the Middle Devonian “Hamilton fauna” of North American Laurussia originated in the Early Devonian in South American Gondwana.
Źródło:
Acta Palaeontologica Polonica; 2015, 60, 1; 183-200
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ontogeny of a new cyrtosymboline trilobite from the Famennian of Morocco
Autorzy:
Loresey-Aubril, R
Feist, R.
Powiązania:
https://bibliotekanauki.pl/articles/20463.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
trilobite
cyrtosymboline trilobite
Famennian
Trilobita
ontogenesis
Proetoidea
Cyrtosymbolinae
protaspis
remains
Morocco
paleontology
Opis:
Abundant trilobite remains were recovered from late mid−Famennian marlstones from various sites in Eastern Tafilalet, southeast Morocco. All belong to a single taxon previously identified as Cyrtosymbole (Waribole) prima. This taxon is designated the type species of Osmolskabole gen. nov. A redefinition of this species, including the description of newly discovered, disarticulated exuviae both in limestone and silicified state of preservation, is given. In particular, silicified sclerites of various sizes allow the first complete growth series of a cyrtosymboline proetid to be presented. The close morphological resemblance of its protaspid stages to known proetoid larvae emphasizes the homogeneity of the early ontogeny in this superfamily. The Famennian proetoid anaprotaspis is also of comparable size to that of other Devonian proetoid larvae. However, their size−range is much less than that observed in Carboniferous larvae. This suggests that the survival of proetoid trilobites at the Frasnian−Famennian Kellwasser crisis did not result from a modification of the developmental strategy, as it might have been the case at the terminal Devonian extinction event. Moreover, O. prima possesses a plectrum from the metaprotaspid to the mid meraspid periods. This implies that the natant hypostomal condition is not steadily acquired early in the ontogeny of the Proetida. Thus we preclude the use of this character in the diagnosis of this order.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł

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