Fromentelligyra
Alloiteau, 1952, p. 639
Type Species
Stenogyra plicata Fromentel, 1861, p. 154; Monotypy
Type Specimen: Lectotype; MNHN M03788; Verified; Dry Preserved
Type Locality: Oxfordian (Upper Jurassic) of Champlitte (Haute Saône; France)
The type material is figured for the first time in Fromentel 1865, p. 16, pl. 9 fig.1. Lectotype was fixed by abusive designation of holotype in Alloiteau 1956.
Classification
Description
Colonial flabelloid corallum covered by a thick tectura with strong costae. A single valley strongly bent with centers visible with the curvature of septa. Radial elements are compact free exsert bicuneiform costosepta, swollen on the inner edge, straight to curved, strongly hierarchised with regard to their thickness. Granules on lateral faces. Thin lamellar columella. Endotheca not observed. Wall probably septoparathecal.
Comparisons
Very close of Rhipidogyra but there are distinct centers in the valley which is strongly bent.
Remarks
Alloiteau 1957 mentioned that the costae corresponding to S1 are developed over the all height of the corallum This is also drawn in the figure by Fromentel 1865 but it has not been observed on the lectotype; This confusion is probably related to the incrustations by serpulids. The ornamentation described by Alloiteau 1957 is purely diagenetic and due to an intense silicification, the figures 188-189 are highly conceptual.
Distribution
- Western Europe; Late Jurassic
This page has been in preparation since 18-Aug-2009 17:46
This version was contributed by Bernard Lathuilière on 01-Mar-2010 16:48.
Page authors are: Bernard Lathuilière. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Bernard Lathuilière
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