Hemichoanella Teichert & Glenister 1954

• Main Authors: Kröger, Björn, Pohle, Alexander
• Format: Other/Unknown Material
• Language: unknown
• Published: 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Cephalopoda; Tetrabranchia; Ellesmeroceratidae; Hemichoanella; Ny Friesland; Spitsbergen
• Online Access: https://zenodo.org/record/5793528; https://doi.org/10.5281/zenodo.5793528

Genus Hemichoanella Teichert & Glenister, 1954 Type species Hemichoanella canningi Teichert & Glenister, 1954, from Emanuel Formation, stage III (Bendigonian– Chewtonian, see Legg 1978; Floian), Emanuel Creek, Kimberley Division, Western Australia; by original designation. Diagnosis Orthoconic longicones with circular conch cross section; sutures with deep, narrow siphonal lobe; siphuncle marginal, nearly tubular with rSD ≈ 0.3; septal necks hemichoanitic, connecting ring thick (compiled from Teichert & Glenister 1954 and Furnish & Glenister 1964). Remarks The genus is provisionally placed within the Cyptendoceratidae because of the presence of a relatively wide siphuncle with relatively long septal necks and concave, relatively thick connecting rings (see additional remarks below in chapter Cladistic Analysis). 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 page 47, DOI:10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422