Temat: dendroid graptolite - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Graptolodendrum mutabile n.gen., n.sp. - an aberrant dendroid graptolite
Graptolodendrum mutabile n.gen., n.sp. - aberrantny graptolit dendroidowy
Graptolodendrum mutabile n.gen., n.sp. - aberrantnyjj dendroidnyjj graptolit
Autorzy:: Kozlowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/22590.pdf
Data publikacji:: 1966
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: paleontology
Graptolodendrum mutabile
new genus
new species
dendroid graptolite
graptolite
Polska
Dendroidea
Middle Ordovician
Ordovician
Źródło:: Acta Palaeontologica Polonica; 1966, 11, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The ultrastructure and building of graptolite dissepiments
Autorzy:: Urbanek, A
Mierzejewski, P.
Powiązania:: https://bibliotekanauki.pl/articles/22043.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: paleontology
ultrastructure
graptolite
building
rhabdosome
dendroid graptolite
Hemichordata
Graptolithoidea
Dendroidea
Dictyonema
dissepiment
skeletal tissue
Ordovician
Opis:: Dissepiments or connecting bars between adjacent stipes in rhabdosomes of dendroid graptolites were studied by means of electron microscopy (SEM and TEM). The material, chemically isolated from rock matrix, originating from the Ordovician of Estonia and glacial boulders of Baltic origin found in Poland, is assigned provisionally to the genus “Dictyonema” sensu lato. Early growth stages of dissepiments are made only of the fusellar component. Older dissepiments are composed of the central core and the outer envelope: the central core is made of rather irregularly arranged growth units made of the fusellar tissue, whereas the outer envelope has a distinct cortical appearance. TEM observations indicate that the fusellar component is made of both typical fusellar and microfusellar tissues (the latter with complete and reduced microfuselli). The cortical component of dissepiments is made both of dependent and independent cortex. The opinion is advanced that the dissepiments were constructed externally by the mortaring activities of zooids, similar to that of Recent Cephalodiscus. Our observations indicate that bizooids were most probable dissepiment constructors. These results, in general, does not support earlier opinions that dissepiments are made of cortical tissue acquiring a fusellar aspect in some cases, and that dissepiments were produced by the extrathecal membrane surrounding the rhabdosome.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 2; 243-252
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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