Astieridiscus Explained

Astieridiscus is an extinct lower Cretaceous ammonite. Its shell evolute, covered by dense, simple or branching, slightly flexuous ribs. The sides are slightly flattened, the venter rounded. No umbilical or other tubercles except on innermost whorl. Superficially resembles Olcostephanus.^[1]

External links

• Web site: Astieridiscus . Paleobiology Database . 30 December 2021.
• Web site: Asteriediscus . Encyclopedia of Life (EOL). 30 December 2021.
• Book: [[Claud William Wright| Wright]], Claud William; with John Hannes Callomon and M.K. Howarth . 1996 . Mollusca 4 Revised, Cretaceous Ammonoidea in Treatise on Invertebrate Paleontology Part L . Roger L. Kaesler . The Geological Society of America & University of Kansas Press. Boulder, Colorado and Lawrence, Kansas . registration . 48.
• Book: . Furnish, W. M. . Kummel, Bernhard . Miller, A.K. . Moore, R.C. . Schindewolf, O.H. . 1957 . Part L, Mollusca 4: Cephalopoda, Ammonoidea . Treatise on Invertebrate Paleontology . Geological Society of America and University of Kansas Press . Raymond C. Moore . Raymond Cecil Moore . registration . L372 . Internet Archive.

Notes and References

1. https://www.worldcat.org/oclc/61988855 Wright, C. W. with J.H. Callomon and M.K. Howarth (1996), Mollusca 4 Revised, Cretaceous Ammonoidea, vol. 4