Cenoceras

Cenoceras is an extinct genus within the cephalopod mollusc family Nautilidae, which in turn makes up part of the superfamily Nautilaceae. This genus has been described by Hyatt in 1884. The type species is Cenoceras intermedium, which was originally described by Sowerby 1816 as Nautilus intermedius.[1]

Cenoceras
Temporal range:
Restoration
Fossil of Cenoceras species from Mahajanga, Madagascar
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Nautilida
Family: Nautilidae
Genus: †Cenoceras
Hyatt, 1884

Species
  • †Cenoceras boreale Dagys and Sobolev 1988
  • †Cenoceras rumelangense Weis & Schweigert 2023[2]
  • †Cenoceras trechmanni Kummel 1953

[3]

Description

Shells of these nektonic carnivores are variable in form, depending on species; ranges from evolute to involute, compressed lenticular to globose with rounded to flattened venter and flanks. The suture generally has shallow ventral and lateral lobes. The location of the siphuncle is variable, but never at an extreme ventral or dorsal position (Kümmel 1964, K449).

Fossil range

Cenoceras has a fossil range from the Upper Triassic, Carnian age to the Middle Jurassic, Callovian age (from 235.0 to 163.5 Ma).[3][4]

References
  1. Sowerby, James (1815–1818). The mineral conchology of Great Britain; or coloured figures and descriptions of those remains of testaceous animals or shells, which have been preserved at various times and depth in the Earth. Vol. 2. London.
  2. Weis, Robert; Schweigert, Günter; Wittische, Julian (2023-09-28). "A new giant nautilid species from the Middle Jurassic of Luxembourg and Southwest Germany". Swiss Journal of Palaeontology. 142 (1): 24. doi:10.1186/s13358-023-00290-6. ISSN 1664-2384.
  3. The Paleobiology Database
  4. Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
  • Kümmel, B. 1964, Nauiloidea-Nautilida, in The Treatise on Invertebrate Paleontology, Part K, Nautiloidea; Geological Society of America and University of Kansas Press.
  • Cyril Walker & David Ward (1993) - Fossielen: Sesam Natuur Handboeken, Bosch & Keuning, Baarn. ISBN 90-246-4924-2


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