Chidleyenoceras
{{Short description|Extinct genus of molluscs}}
{{Taxobox
| fossil_range = Middle Ordovician
| image =
| regnum = Animalia
| phylum = Mollusca
| classis = Cephalopoda
| subclassis = Nautiloidea
| ordo = Tarphycerida
| subordo = Barrandeocerina
| familia = Plectoceratidae
| genus = Chidleyenoceras
| genus_authority = Shimizu & Obata, 1935
}}
Chidleyenoceras is a Middle Ordovician tarphyceroid with a closely coiled, evolute shell; whorl section subquadrate, widest just above a broadly rounded venter; dorsum with a broad shallow impression; sutures moderately spaced, weakly sinuous; siphuncle large, subventral, apparently orthochoantitic{{clarify|date=March 2023}} with tubular segments.
The tubular, subventral siphuncle separates Chidleyenoceras from the Apsidoceratidae (Sweet, 1964) where it had been included and puts it well into the Plectoceratidae (Flower, 1984).
References
{{Reflist}}
- Flower, (1984). Bodeiceras; a New Mohawkian Oxycone, with Revision of the Older Barrandeocerida and Discussion of the Status of the Order. Journal of Paleontology v. 58, no.6, pp 1372–1379, Nov. 1984.
- Walter C Sweet, 1964 Nautiloidea-Barrandeocerida; Treatise on Invertebrate Paleontology Part K Mollusca 3. Geological Society of America and University of Kansas Press.
{{Taxonbar|from=Q5096618}}
Category:Prehistoric nautiloid genera
Category:Ordovician cephalopods