- Tytuł:
- Ontogeny and variability in ribbing of Late Valanginian lamellaptychi (Ammonitina)
- Autorzy:
-
Vašíček, Z.
Klein, J.
Janssen, N. M .M. - Tematy:
-
Lamellaptychi
Mortilletilamellaptychus
ontogeny
Late Valanginian
south-eastern France - Pokaż więcej
- Wydawca:
- Polskie Towarzystwo Geologiczne
- Powiązania:
- https://bibliotekanauki.pl/articles/191449.pdf Link otwiera się w nowym oknie
- Opis:
- Late Valanginian (Early Cretaceous) lamellaptychi of the genus Mortilletilamellaptychus were collected from seven ammonite-controlled sections in south-eastern France demonstrate distinct changes in ribbing during growth. Simpler juvenile ribbing, which is essentially uniform for all of the specimens studied, differs distinctly from the complicated arrangement of the adult ribs. Changes in ribbing morphology were observed in the five species studied, two of which were identified as new (i.e. Mortilletilamellaptychus heterocostatus sp. nov. and M. bicostatus sp. nov.).
- Dostawca treści:
- Biblioteka Nauki
Artykuł