Development and calcification of the ammonitella shell

• Autorzy: Kulicki C , Doguzhaeva L A
• Języki publikacji: EN

Abstrakty

EN

Aconeceras trautscholdi ammonitellae mass occurring in the Aptian of Symbirsk, central Russia represent consecutive calcification stages of the primary organic shell wall. Already after the formation of the organic shell with proseptum, the first whorl and umbilical walls of the initial chamber were calcified, then the remaining part of the initial chamber, and finally the nacreous primary constriction was formed and the proseptum was calcified. The original mineral participating in calcification was aragonite, which formed primary prismatic layers. The ammonite embryonic shell was thus formed similarly to the archaeogastropod larval shell. This explains the microstructural distinction of the ammonitella and proseptum walls with respect to the rest of the ammonite shell.

PL

Muszle embrionalne (amonitelle) Aconeceras, masowo występujace w konkrecjach aptu Syrnbirska, ukazują kolejne stadia kalcyfikacji ścianek. Pierwotna muszla amonitelli była niezmineralizowana, podobnie jak muszla larwalna dzisiejszych ślimakow Archaeogastropoda.

Słowa kluczowe

PL

fauna kopalna; Aconeceras trautscholdi; skamienialosci; jura; slimaki; muszle larwalne; paleontologia; amonity; muszle embrionalne; Archaeogastropoda; Aconeceras

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1994
• Tom: 39
• Numer: 1
• Opis fizyczny: s.17-44,rys.,fot.,bibliogr.

Twórcy

autor

Kulicki C

• Instytut Paleobiologii PAN, Aleja Zwirki i Wigury 93, 02-089 Warszawa

autor

Doguzhaeva L A

• Paleontological Institute of the Russian Academy of Sciences, Profsojuznaja 123, Moscow 117868, Russia

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