Clausastrea
Orbigny, 1849, p. 9
Type Species
Clausastrea tessellata D'Orbigny, 1849, p. 9; Monotypy
Type Specimen: Lectotype; MNHN R10849; Verified; Dry Preserved
Type Locality: Bajocian (Middle Jurassic) from Langres (Haute-Marne; France)
Till recently only one specimen of the type species was known, but other samples were rediscovered in the collections of MNHN. Then the type specimen abusively considered as a holotype is now a lectotype. A description of the type specimen is given by Thevenin in Cottreau (1911) and Alloiteau (1960). It is figured also in Lathuilière (2000)
Classification
Description
Colonial massive subthamnasterioid to submeandroid according to species. Radial elements are subconfluent to confluent according to species. No holotheca, no wall. Radial elements are compact costosepta or biseptal sheets of Montlivaltid structure. Rarely anastomosed Intracalicular increase dominant. Well developed endotheca made of tabulae and very large dissepiments producing a characteristic wavy pattern in longitudinal section. Deep parts of the endotheca in the axial zones of corallites. No synapticule, no columella.
Remarks
20 nominal species known in Jurasssic and 13 in Cretaceous (Löser 2000). Probably polyphyletic.
This page has been in preparation since 07-May-2009 21:39
This version was contributed by Bernard Lathuilière on 03-Mar-2010 13:24.
Page authors are: Bernard Lathuilière. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Ann Budd
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