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Anapachydiscus

From Wikipedia, the free encyclopedia

Anapachydiscus
Temporal range: 85.8–66 Ma
Anapachydiscus wittekindi
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Pachydiscidae
Genus: †Anapachydiscus
Yabe & Shimizu, 1926

Anapachydiscus is an extinct cephalopod genus from the Upper Cretaceous, Santonian - Maastrichtian of Europe, Africa, Madagascar, S.India, N Z, Calif. Mexico, Argentina, and the Antarctic belonging to the ammonoid family Pachydiscidae.

Anapachydiscus has a rather involute shell with a broad to moderately compressed whorl section. Early whorls smooth, intermediary develop straight or slightly curved, radial ribs that thicken toward the umbilicus. Outer whorls may again be smooth, or have coarse ribs so as to resemble Eupachydiscus.

References

  • Treatise on invertebrate Paleontology, Part L, Mollusca 4. Mesozoic Ammonoidea. Geological Society of America and Univ. Kansas Press (1957)
  • Anapachydiscus-Paleodb 5/02/11


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This page was last edited on 13 April 2021, at 18:37
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