Olenidslettoceras Kröger & Pohle 2021
- Dataset
- Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
- Rank
- GENUS
- Published in
- Kröger, Björn, Pohle, Alexander (2021): Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities. European Journal of Taxonomy 783 (1): 1-102, DOI: 10.5852/ejt.2021.783.1601, URL: http://dx.doi.org/10.5852/ejt.2021.783.1601
Classification
- phylum
- Mollusca
- class
- Cephalopoda
- order
- Tetrabranchia
- family
- Rioceratidae
- genus
- Olenidslettoceras
description
Comparison See discussion of type species.
description
urn: lsid: zoobank. org: act: D 66 D 41 DD- 0 A 41 - 4110 - BFF 7 - 1 E 014 ED 180 FA
diagnosis
Diagnosis Slender, depressed, exogastric cyrtocones. Angle of expansion larger in apical portions. Adoral portions of mature specimens less curved and with low angle of expansion. Chambers narrowly spaced. Thin siphuncle positioned near conch margin at convex side with thick connecting rings which are tubular at the dorsal side and concave at the ventral side. Septal necks are very short, thickened, and orthochoanitic to suborthochoanitic.
type_taxon
Type species Olenidslettoceras farmi gen. et sp. nov., from 120.3 m (PO 123.3) above base of Olenidsletta Member, V 2 a trilobite zone, Blackhillsian, Floian by original designation.