Kobyastraea
Roniewicz, 1970: 140
In earlier literature described among species of the genus Thamnasteria Lesauvage, 1823
Type Species
Thamnastrea lomontiana Etallon in Thurmann and Etallon 1864: 399, pl. 56, fig. 14; Original Designation Roniewicz, 1970: 140
Type Specimen: Holotype; MJSN 0 188; Not Traced; Dry Preserved
Type Locality: Caquerelle, Jura Mts, Switzerland. Late Oxfordian (“Rauracien supérieur”), Late Jurassic.
The type species was described in detail in Roniewicz 1970: 140 based on topotype specimens housed at the NHMN Bâle from the coll. Koby. The specimens were illustrated: D 157 in Pl. 1, fig. 1, Pl. 2, fig. 1, Pl. 3, fig. 4, and specimen D 465 in Pl. 1, fig. 2.
Classification
Diagnosis
Thamnasterioid; septal distal margin denticulated, inner margin with regular projections reaching columella, lateral septal granules in subvertical ranges; columella styliform, built of a few trabeculae; synapticulae present; synapticular wall in species with crowded calices; endotheca tabuloid; increase by extracalicular budding or intracalicular budding with lamellar connections. Microstructure: Main trabecular body monoaxial, thick from 100 to about 300µm, lateral projections (secondary trabeculae) circular in section, pointed or horizontally flattened.
Description
The genus was monographed in Roniewicz 1970, with description of three species wastly distributed in Europe, and in 1979 a new family, Kobyastraeidae, was erected.
Comparisons
In septal micromorphology (trabeculae with pointed lateral granules) similar to Clausastrea d’Orbigny from which differs, primarily, in having columella and synapticulae. From all thamnasterioid genera, in this number Thamnoseris Etallon especially similar in the size of corallites, it differs in tabuloid endotheca and thick trabeculae provided with monoaxial lateral projections emerging on the septal faces as granulae, not pennulae .
Remarks
Four species are known from the Late Jurassic of Europe.
Distribution
- Western Europe; Late Jurassic
- Southern Europe; Late Jurassic
- Central Europe; Late Jurassic
Known from the middle Oxfordian of Suisse and Poland, Late Oxfordian of France and Poland and Early Kimmeridgian of Portugal, France, Germany, Poland and Rumania.This page has been in preparation since 19-Aug-2009 14:51
This version was contributed by Ewa Roniewicz on 21-Nov-2010 19:19.
Page authors are: Ewa Roniewicz. 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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