Squires, 1960, p. 57 (pro Wellsia Squires)

Wellsotrochus Squires, 1960, p. 57 (pro Wellsia Squires) is a replacement taxon for Wellsia Squires, 1958, p. 57.

Type Species

Wellsia cyathiformis Squires, 1958:. 57, pl. 10, figs 16-20; Original Designation Squires, 1960:.1053

Type Specimen: Holotype; 9a and H74; Verified; Unknown

Type Locality: Campanian-Maastrichtian (Haumurian) of New Zealand.




Solitary, discoidal, bowl-shaped to variably conical, ?free, with flat, rounded, or somewhat pointed base. Calice circular to slightly elliptical in outline. Costosepta compact, hexamerally arranged. Costae presumed granular. Pali and paliform lobes absent. Columella styliform to sublamellar. Wall imperforate.


In creating the genus Wellsotrochus (pro Wellsia), Squires (1958, p. 57) described its growth form simply as “bowl-shaped” but he included specimens of various growth types, e.g., patellate, turbinate-trochoid, and bowl-shaped, indicating a wide range of growth types as one charactistic of this genus. It should be noted, however, that in most specimens the early juvenile stage is closest to the turbinate form (Baron-Szabo, 2008, p. 83).


  • Antarctica; Late Cretaceous
Campanian-Maastrichtian: New Zealand, Maastrichtian: Antarctic Peninsula, Lower Danian: Denmark (Greenland).

This page has been in preparation since 02-Jun-2007 12:36

This version was contributed by Rosemarie Baron-Szabo on 11-Apr-2013 17:34.

Page authors are: Rosemarie Baron-Szabo. Please contact the editor if you would like to contribute to the diagnosis of this taxon.

The editor is: Rosemarie Baron-Szabo

View of aboral surface
Wellsotrochus discus Squires, 1962, holotype