Svalbardoceras sterna Kröger & Pohle 2021, gen. et sp. nov. ...

• Main Authors: Kröger, Björn, Pohle, Alexander
• Format: Text
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Cephalopoda; Tetrabranchia; Rioceratidae; Svalbardoceras; Svalbardoceras sterna; Ny Friesland; Spitsbergen
• Online Access: https://dx.doi.org/10.5281/zenodo.5795797; https://zenodo.org/doi/10.5281/zenodo.5795797

Svalbardoceras sterna gen. et sp. nov. urn:lsid:zoobank.org:act: F4069C31-5F45-44C0-A05D-03223749C9DE Figs 12B, 16C–D, 19D, 20– 21, 22E–G, 23A, C, E, G Diagnosis Slightly curved longicones with compressed conch cross section; with shallow irregularly spaced undulations that are more pronounced in later growth stages and with fine, irregularly spaced, directly transverse imbricate growth lines which form a shallow hyponomic sinus at prosiphuncular side of the conch; thin marginal siphuncle with rSD ≈ 0.13, siphuncle positioned at concave side of conch curvature; septal necks orthochoantic to loxochoantic, connecting ring nearly tubular, weakly concave. Etymology Referring to the laridid genus Sterna Linneaus, 1758, birds which were common companions during our field work at Profilstranda, Ny Friesland. Type material Holotype Specimen FMNH-P30368. Paratypes Forty-four specimens (P30368 to P30382, P30437 to P30449, P30451 hasta P30462, P30465, P30466, P30468 to P30470; see Suppl. file 1 for list of specimens) ... : 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 30-32, DOI: 10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422 ...