Cyptendoceratidae Zhuravleva 1994
Family Cyptendoceratidae Zhuravleva, 1994 Emended diagnosis Straight longicones with siphuncle marginal or submarginal, relatively wide with concave or convexoconcave segments; septal necks short, loxochoanitic to orthochoanitic; connecting rings relatively thick; endosiphuncular deposits form thick...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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2021
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| Online Access: | https://zenodo.org/record/5794305 https://doi.org/10.5281/zenodo.5794305 |
| Summary: | Family Cyptendoceratidae Zhuravleva, 1994 Emended diagnosis Straight longicones with siphuncle marginal or submarginal, relatively wide with concave or convexoconcave segments; septal necks short, loxochoanitic to orthochoanitic; connecting rings relatively thick; endosiphuncular deposits form thick ventral rod which merges adapically into a complete siphuncular filling, diaphragms unknown; cameral deposits epi- and hyposeptal, concentrated on prosiphuncular side. Remarks The diagnosis of the Cyptendoceratidae largely follows Zhuravleva (1994), but is more restricted following the emendation of the Baltoceratidae by Kröger et al. (2007), in which rod-bearing smooth longicones with tubular siphuncles, such as Rangeroceras Hook & Flower, 1977, Rhabdiferoceras Flower, 1964 and Veneficoceras Hook & Flower, 1977, are now included within the Baltoceratidae. The family now contains rod-bearing smooth and annulated forms with concave siphuncular segments and includes four genera: Cyptendoceras Ulrich & Foerste, 1936, Amsleroceras Hook & Flower, 1977, Catoraphiceras Ulrich & Foerste, 1936, and Hemichoanella Teichert & Glenister, 1954. 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 44, DOI:10.5852/ejt.2021.783.1601, http://zenodo.org/record/5793422 |
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