Alcidellus
| Alcidellus Temporal range: Bathonian–Callovian[1] | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ammonitida |
| Superfamily: | Haplocerataceae |
| Family: | Oppeliidae |
| Genus: | Alcidellus Westermann, 1958 |
Alcidellus is an oxyconic (sharp ventered) haploceratacean ammonite from the Middle Jurassic.
Alcidellus was named as a genus buy Gerd Westermann in 1958. It is now generally seen as a subgenus of Oxycerites, differing from Oxyceratites (O) in having a broader venter with ventrolateral shoulders. The shell of Oxycerites, including O (Alcidellus) is generally smooth, essentially involute with a small umbilicus, highly compressed with flanks converging on a narrow, somewhat sharp venter. Sutures are ammonitic.
References
- An Early Bathonian Tethyan Ammonite Fauna from Argentina, by Alberto C Riccardi and Gerd E.G. Westermann. Palaeontology, Volume 42. no2, pub online 21 Nov 2003.
- Upper Bathonian and lower Callovian ammonites from Chacay Melehue
(Argentina), by Horacio Parent. Acta Palaeontologica Polonica 43, 1, 69-130. 1998.
- ↑ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
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