Biodiversity Literature Repository
Published December 20, 2021 | Version v1
Taxonomic treatment Open

Protocycloceras Hyatt 1900

Creators

  • 1. Finnish Museum of Natural History, University of Helsinki, PO Box 44, FI- 00014 Helsinki, Finland.
  • 2. Paläontologisches Institut und Museum, University of Zurich, Zurich, Switzerland.

Description

Genus Protocycloceras Hyatt, 1900 Type species

Orthoceras lamarcki Billings, 1859, from the Fort Cassin Formation (Floian Stage), Township of Godmanchester, Huntingdon County, southwest Quebec; by original designation.

Diagnosis

Nearly straight, annulated longicones with circular or subcircular cross section and straight sutures; camerae narrow, about 6–7 over a length similar to conch cross section; siphuncle located between center and ventral conch margin; siphuncular segments concave; septal necks short, loxochoanitic to orthochoanitic; connecting ring comparatively thick; siphuncular deposits wedge out adorally at steep angle to ventral side; diaphragms in apical portions of siphuncle; epi-and hyposeptal cameral deposits more strongly developed on ventral side (adopted from Kröger & Landing 2009).

Remarks

The genus Protocycloceras is type genus for the Protocycloceratidae Kobayashi, 1935. Based on the cladistic analysis (below) this family is abandoned. The genus clusters consistently with other members of the Troedsonellida, such as Buttsoceras (see below). The close relationship between the two genera is also suggested by the combination of diaphragms and endosiphuncular linings, which is unknown in any other genus.

Notes

Published as part of Kröger, Björn & Pohle, Alexander, 2021, Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities, pp. 1-102 in European Journal of Taxonomy 783 (1) on pages 52-53, DOI: 10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422

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Linked records

Additional details

Identifiers

URL
http://treatment.plazi.org/id/5F4487ACFF9FFF9AFD9E7CB6FEA17BBA

Is part of
Journal article: 10.5852/ejt.2021.783.1601 (DOI)
Journal article: http://zenodo.org/record/5793422 (URL)
Journal article: http://publication.plazi.org/id/A37DFFD4FFACFFAEFFD67F14FFDE7A64 (URL)
Journal article: http://zoobank.org/071EAD63-05ED-4D6C-AC45-8719E6D79E0B (URL)
Is source of
https://sibils.text-analytics.ch/search/collections/plazi/5F4487ACFF9FFF9AFD9E7CB6FEA17BBA (URL)
https://www.gbif.org/species/191693650 (URL)
https://www.checklistbank.org/dataset/2884/taxon/5F4487ACFF9FFF9AFD9E7CB6FEA17BBA.taxon (URL)

Biodiversity

Family
Protocycloceratidae
Genus
Protocycloceras
Kingdom
Animalia
Order
Tetrabranchia
Phylum
Mollusca
Scientific name authorship
Hyatt
Taxon rank
genus
Taxonomic concept label
Protocycloceras Hyatt, 1900 sec. Kröger & Pohle, 2021

References

  • Billings E. 1859. Fossils of the calciferous sandrock, including those of a deposit of White Limestone at Mingan, supposed to belong to the formation. Canadian Naturalist and Geologist, Proceedings of the Society of Natural History Montreal 4: 345 - 367.
  • Kroger B. & Landing E. 2009. Cephalopods and paleoenvironments of the Fort Cassin Formation (Upper Lower Ordovician), eastern New York and adjacent Vermont. Journal of Paleontology 83: 664 - 693. https: // doi. org / 10.1666 / 08 - 181.1