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Article: The ammonite Stoliczkaia from the Cenomanian of England and northern France

Publication: Palaeontology
Volume: 21
Part: 2
Publication Date: May 1978
Page(s): 393 409
Author(s): C. W. Wright and W. J. Kennedy
DOI:
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How to Cite

WRIGHT, C. W., KENNEDY, W. J. 1978. The ammonite Stoliczkaia from the Cenomanian of England and northern France. Palaeontology21, 2, 393–409.

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Abstract

Stoliczkaia Neumayr, 1875, a predominantly Upper Albian genus of world-wide occurrence, is represented in the Lower Cenomanian of England and northern France by a species of the subgenus S. (Shumarinaia) Matsumoto and Inoma, 1975, and by two species referred to a new subgenus, S. (Lamnayella) Wright and Kennedy nov. This new subgenus is shown to include the previously described S. texana (Cragin), S. uddeni Bose, S. crotaloides (Stoliczka), and S. clavigera Neumayr. S. (Lamnayella) probably evolved from S. (Stoliczkaia) by development of juvenile stages with a more markedly fastigiate venter, a feeble siphonal tubercle, middle growth stages with markedly bullate narrow strong ribs which either branch from bullae or are intercalated between primaries, and a mature stage with strong, distant, narrow, predominantly long ribs. It is an independent development parallel to, but distinct from, the contemporaneous Paracalycoceras Spath, 1925.
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