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Structural and morphological indicators of mode of life in the Aptian lytoceratid ammonoid Eogaudryceras
Swedish Museum of Natural History, Department of Paleobiology. (palaeozoology)
Swedish Museum of Natural History, Department of Paleobiology. (palaeozoology)
Swedish Museum of Natural History, Department of Paleobiology. (palaeozoology)
2010 (English)In: Cephalopods - Present and Past / [ed] Tanabe, K., Shigeta, Y., Sasaki, T. & Hirano, H., Tokyo, Japan: Tokai University Press , 2010, First, 123-130 p.Chapter in book (Refereed)
Abstract [en]

The shell wall ultrastructure, collars, wrinkle layer, siphuncle morphology, and the ultrastructure of the connecting rings are described in the Aptian (Early Cretaceous) lytoceratid Eogaudryceras Spath from Adygeya, north-western Caucasus, Russia. The collars are pronounced and number 4-5 per shell whorl. They enlarged the shell surface and increased the buoyancy and mechanical shell strength. The siphuncular tube consists of calcareous prochoanitic septal necks and cuffs that became proportionally longer during the ontogeny, and comparatively short, organic (possibly glycoprotein) connecting rings that are phosphatized and consist of aggregates of small globular particles. There is some evidence of a porous structure, which may have provided a higher permeability of the connecting rings and increased the gas/liquid exchange between the siphuncle and shell chambers for vertical migrations. The morphological and structural shell characteristics indicate that the shell design was adapted for pelagic, probably deep-water habitat, and vertical, possibly diurnal, migrations.

Place, publisher, year, edition, pages
Tokyo, Japan: Tokai University Press , 2010, First. 123-130 p.
Keyword [en]
Lytoceratida, Lower Cretaceous, Aptian, north-western Caucasus, collars, connecting rings, micro-porosity, mode of life
National Category
Natural Sciences
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-1366OAI: oai:DiVA.org:nrm-1366DiVA: diva2:862548
Projects
shell morphology and ultrastructure as a key to cephalopod phylogeny and mode of life
Available from: 2015-10-22 Created: 2015-10-22 Last updated: 2015-11-26Bibliographically approved

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • asciidoc
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