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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.


  • 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. [2]

  1. ^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.