Alloiteau, 1957, p. 289

Type Species

Oroseris explanata de Fromentel, 1857: 33; Original Designation Alloiteau, 1957: 289

Type Specimen: Holotype; ; Verified; Unknown

Type Locality: Lower Hauterivian of France (Yonne).

The holotype of the type species is housed at MNHN (Paris) under M03720.



Colonial, massive, meandroid. Gemmation intracalicinal-terminal, forming calicinal series separated by tectiform collines. Calices distinct. Septa subcompact, finely granulated laterally. Synapticulae numerous. Columella spongy-parietal. No wall between calicinal series. Endothecal dissepiments thin.


  • Southern Europe, Central Europe; Early Cretaceous - Late Cretaceous
  • Eastern Europe; Early Cretaceous
  • Australasia; Late Cretaceous

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

This version was contributed by Rosemarie Baron-Szabo on 12-Sep-2010 19:40.

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

Vallimeandra explanata (de Fromentel, 1857), holotype
Vallimeandra explanata (de Fromentel, 1857), holotype, close-up