Prodonacosmilia
Melnikova, 1976: 107
Type Species
Prodonacosmilia dronovi Melnikova, 1976: 107, text-fig. 5, pl. 26, fig.1 a, b; Monotypy Melnikova, 1976: 107
Type Specimen: Holotype; ZPAL IGD 510/22154; Verified; Thin Section
Type Locality: Creek Dzanghi-davan say, SE Pamirs. Sinemurian, Early Jurassic
Diagnosis
Phaceloid, epithecate, increasing by lateral budding. Septal blades, with the exception of wall region and axial cavity, are vertically discontinuous, lonsdaleoid, extending in the form of ridges on dissepiments; in the axial cavity septa are compact which results in formation of a kind of columellar structure. Endotheca composed of large, oblique dissepiments at the periphery, continuing into tabuloid, sub-horizontal ones at the corallite center.
Description
The type species was described and illustrated by Melnikova in Melnikova and Roniewicz, 1976: 107, pl. 26, fig.1 a, b together with Tithonian Prodonacosmilia sp.(1976: 108, pl. 26, fig. 2,3) from the coll. Eliášová, from Štramberk, Carpathians.
Comparisons
From phaceloid Donacosmilia Fromentel, 1861 which shows large dissepiments and a tendency to form temporary lonsdaleoid septa, the genus differs in permanent lonsdaleoid state of septal apparatus, and formation of blades only fragmentarily compact in the wall region and at the corallite axis; the latter condition results in formation of a false columellar structure observable in transverse sections. In discontinuous structure of radial elements, the coral resemble plocoid genus Cyathophora Michelin, 1843.
Remarks
Two species are known.
Distribution
- Central Asia; Early Jurassic
- Central Europe; Late Jurassic
This page has been in preparation since 19-Aug-2009 17:18
This version was contributed by Ewa Roniewicz on 28-Nov-2010 14:29.
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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