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Litophragmatoceras incomptum gen. et sp.nov. (Cretaceous Ammonoidea), a cryptic micromorph from the Upper Cenomanian of Arizona

Published online by Cambridge University Press:  01 May 2009

W. J. Kennedy  and
W. A. Cobban
W. J. Kennedy
Affiliation:
Geological Collections, University Museum, Parks Road, Oxford OX1 3PW, U.K.
W. A. Cobban
Affiliation:
U.S. Geological Survey, Paleontology and Stratigraphy Branch, Box 25046, Mail Stop 919, Denver Federal Center, Denver, Colorado 80225, U.S.A.
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Abstract

Litophragmatoceras incomptum gen. et sp.nov. is a small dimorphic planulate ammonite from the Upper Cenomanian Metoicoceras mosbyense Zone of Arizona in which microconchs are adult at as little as 5 mm diameter and macroconchs at 23 mm diameter or less. The quinquelobate suture is very simple, with entire lobes and saddles. It is distinct from all contemporaneous ammonites and is referred, with no great certainty, to the otherwise exclusively Upper Albian and Lower Cenomanian Flickiinae Adkins, 1928.

Type
Articles
Information
Geological Magazine , Volume 125 , Issue 5 , September 1988 , pp. 535 - 539
Copyright
Copyright © Cambridge University Press 1988

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