Anapachydiscus

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
Temporal range: 85.8โ€“66 Ma
Anapachydiscus wittekindi
Scientific classification
Kingdom:
Phylum:
Class:
Subclass:
Superfamily:
Family:
Genus:
Anapachydiscus

Yabe & Shimizu, 1926

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


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.