What's behind a name: The taxonomic status of Helicancylus Gabb, 1869 and Hamiticeras Anderson, 1938 (Ammonoidea, Lower Cretaceous)

The present contribution illustrates the type material of the Lower Cretaceous ammonoids Ptychoceras aequicostatusGabb, 1864 (type species of HelicancylusGabb, 1869) and Hamiticeras pilsbryiAnderson, 1938 (type species of HamiticerasAnderson, 1938). The typification and taxonomic validity of both ge...

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Bibliographic Details
Published in:Journal of paleontology 2023-05, Vol.97 (3), p.566-576
Main Authors: Frau, Camille, Bulot, Luc G.
Format: Article
Language:English
Subjects:
Ammonoidea
Classification
Cretaceous
Genera
Helicancylus
Museums
Paleontology
REGULAR ARTICLES
Stratigraphy
Taxonomy
Types
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Description
Summary:The present contribution illustrates the type material of the Lower Cretaceous ammonoids Ptychoceras aequicostatusGabb, 1864 (type species of HelicancylusGabb, 1869) and Hamiticeras pilsbryiAnderson, 1938 (type species of HamiticerasAnderson, 1938). The typification and taxonomic validity of both genera are clarified, and the affinities with coeval Acrioceratidae are discussed. Their stratigraphic range is investigated with implications for correlation between northern Pacific and European ammonoid scales.
ISSN:0022-3360
1937-2337
DOI:10.1017/jpa.2023.15