Autor: BENOIT, JULIEN - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Can maxillary canal morphology inform varanopid phylogenetic affinities?
Autorzy:: Benoit, Julien
Ford, David P.
Miyamae, Juri A.
Ruf, Irina
Powiązania:: https://bibliotekanauki.pl/articles/2216331.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:: Varanopidae have historically been classified as members of the basal synapsid grade “Pelycosauria”. However, recent phylogenetic works proposed that varanopids may in fact belong to the Diapsida. Here, we use μCT scanning and digital 3D reconstruction to compare the maxillary canal of the early diapsid Orovenator mayorum, the basal archosauromorph Prolacerta broomi, the ophiacodontid “pelycosaur” Varanosaurus acutrostris, and the varanopid Heleosaurus scholtzi. We find that the maxillary canals of Orovenator and Prolacerta are very similar and differ markedly from those of Heleosaurus and Varanosaurus. In the latter two, the morphology of the maxillary canal closely matches that of the Therapsida, which could support the traditional position of varanopids among the Synapsida.
Źródło:: Acta Palaeontologica Polonica; 2021, 66, 2; 389-393
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The sixth sense in mammalian forerunners: variability of the parietal foramen and the evolution of the pineal eye in South African Permo-Triassic eutheriodont therapsids
Autorzy:: BENOIT, JULIEN
ABDALA, FERNANDO
MANGER, PAUL R.
RUBIDGE, BRUCE S.
Powiązania:: https://bibliotekanauki.pl/articles/945457.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: therapsida
pineal
parietal foramen
third eye
endothermy
permian
triassic
south africa
Opis:: In some extant ectotherms, the third eye (or pineal eye) is a photosensitive organ located in the parietal foramen on the midline of the skull roof. The pineal eye sends information regarding exposure to sunlight to the pineal complex, a region of the brain devoted to the regulation of body temperature, reproductive synchrony, and biological rhythms. The parietal foramen is absent in mammals but present in most of the closest extinct relatives of mammals, the Therapsida. A broad ranging survey of the occurrence and size of the parietal foramen in different South African therapsid taxa demonstrates that through time the parietal foramen tends, in a convergent manner, to become smaller and is absent more frequently in eutherocephalians (Akidnognathiidae, Whaitsiidae, and Baurioidea) and non-mammaliaform eucynodonts. Among the latter, the Probainognathia, the lineage leading to mammaliaforms, are the only one to achieve the complete loss of the parietal foramen. These results suggest a gradual and convergent loss of the photoreceptive function of the pineal organ and degeneration of the third eye. Given the role of the pineal organ to achieve fine-tuned thermoregulation in ectotherms (i.e., “cold-blooded” vertebrates), the gradual loss of the parietal foramen through time in the Karoo stratigraphic succession may be correlated with the transition from a mesothermic metabolism to a high metabolic rate (endothermy) in mammalian ancestry. The appearance in the eye of melanopsin-containing retinal ganglion cells replacing the photoreceptive role of the pineal eye could also have accompanied its loss.
Źródło:: Acta Palaeontologica Polonica; 2016, 61, 4; 777-789
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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