Diplaraea
Milaschewitsch, 1876, p. 229
Type Species
Diplaraea arbuscula Milaschewitsch, 1876, p. 229 pl. 51 fig. 3; Monotypy
Type Specimen: Syntype; SMNS 21875; Verified; Dry Preserved
Type Locality: Nattheimer Schichten, Upper Kimmeridgian Ulmense Subzone (fide Schweigert writtten com. 2010) (Upper Jurassic) from Nattheim (Germany)
The number 21875 corresponds to two syntypes. Only the larger specimen was figured by Milaschewitsch. Fig. 3a was not found
Classification
Description
Dendroid-phaceloid corallum with few branches with subcylindrical corallites commonly exsert. Epitheca nearly absent, only some thin and scarce rhythmic rings. Costae subequal and coarsely and regularly dentate with round robust teeth. Intracalicinal increase. Radial elements are anastomosed costosepta perforate in the septal part to compact in the costal part, slightly bicuneiform straight to curved. Distal edge with regular teeth, inner edge with detached trabecules, Lateral faces with conical granules that can evolve into synapticulae. No palis. Trabecules arranged in fan system Microstructure unknown. Hexameral symmetry not deciphered, bilateral symmetry potentially marked with curvature of septa elongation of the corallite and of axial zone. Endotheca of vesicular dissepiments sloping down outward…. , Columella spongious to papillose with cylindrical or slightly compressed papillae. Regularly synapticulate. No wall.
Comparisons
Haplaraea and Diplaraea were put in synonymy by Geyer 1954. This is quite understandable. In the situation of these two type-species coming from the same Upper Kimmeridgian localities, the colonial character is the only difference and as we know in several other families of corals we can consider several morphogenera within a single specific biological unit (Lathuilière 1976). Then the nomenclatural solution here chosen is to keep both genera not as phyletic genera but as morphogenera.
Distribution
- Western Europe, Southern Europe, Central Europe, Eastern Europe, Caribbean, South America; Late Jurassic - Late Cretaceous
This page has been in preparation since 18-Aug-2009 16:43
This version was contributed by Bernard Lathuilière on 30-Mar-2010 07:01.
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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