Proleptophyllia

Alloiteau, 1952, p. 666

Type Species

Montlivaltia granulum Fromentel de and Ferry de, 1866, p. 136, pl. 24 fig. 2; Monotypy

Type Specimen: Lectotype; MNHN M03533; Verified; Dry Preserved

Type Locality: Pliensbachian of May sur Orne (Calvados, France)

The lectotype is sectioned. erroneously called holotype by Alloiteau 1957. See Alloiteau 1957, p. 114 for another description.

Description

Solitary trochoid corallum cemented on an attachment area. Elliptical calice. Superficial calicular platform . Radial elements are subcompact , straight, anastomosing or free septa or costosepta. with parallel faces. Septa globally attenuated but strongly ornamented, moderately exsert. Lateral faces show pennule like flat granules that do not alternate between neighbouring septa and are not arranged in continuous menianae. The distal edge is ornamented of strong teeth. More the teeth are in the axial region bigger and more detached they are. They produce in the center the appearance of a papillose columella but without relief.. Probable hexameral arrangement. Abundant endotheca. The transverse section of the lectotype does not allow to differentiate synapticules of thick dissepiments. Wall externally smooth, of unknown nature, covering the external part of radial elements.

Remarks

Alloiteau 1957 considered that there is no wall but an epitheca "of endothecal origin" covering the costal part of costosepta. It is possibly true but we can also equally consider that true septa s.s. are exsert in the outer margin and then, the peripheric tissue would be a wall.

Distribution

• Western Europe; Early Jurassic
• North Africa; Early Jurassic

This page has been in preparation since 19-Aug-2009 17:18

This version was contributed by Ken Johnson on 10-Sep-2012 12:02.

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