Eocomoseris
Melnikova Roniewicz and Loeser, 1993: 4
pars Spongiomorpha (Heptastylopsis) Frech, 1890
Type Species
Eocomoseris ramosa Melnikova, 1993: 4; Original Designation Melnikova, 1993: 4
Type Specimen: Holotype; ZPAL IGD 8-Zch; Verified; Thin Section
Type Locality: Valley Zurchertsek, SE Pamirs. Gurumdin svite, Hettangian?/early Sinemurian, Early Jurassic
Eocomoseris ramosa Melnikova, 1993 was replaced with E. gurumdinensis Melnikova nom. subst. in Roniewicz 2010, because of homonymy with Spongiomorpha (Heptastylopsis) ramosa Frech, 1890, which appeared the earliest, Late Triassic, representative of the genus Eocomoseris.
Classification
Diagnosis
Thamnasterioid - subcerioid. Corallites of small dimensions, densely packed, with monotrabecular columella. Radial elements of biseptal type built of a few trabeculae and bearing thick menianes; internal border with terminal pennulae. Dissepiments expanded, abundant. Synapticulae rodlike, rare, constituting incomplete wall between calices. Budding intra-and intercalicular.
Description
In Melnikova et al. 1993 there were described in detail and illustrated two Early Jurassic species (1993:5, pl.1, fig. 1-5), and one Cenomanian species (1993: 7, pl. 2: 1-6); one Late Triassic species was recognized among Frech's Spongiomorpha (Heptastylopsis) and identified with S.(H) ramosa Frech in Roniewicz 2010:xx, pl. fig.xx.
Comparisons
In the structure of corallites: radial elements, columella and endotheca, the genus is similar to Comoseris d’Orbigny, 1849 but differs from it in a lack of collins.
Remarks
The genus was recognized in the Early and Late Jurassic, and in the Cenomanian (Melnikova et al. 1993); stated in the Late Triassic (Roniewicz 2010); four species were described. These corals, for small corallite diameters and porous septa, are hardly recognizable as a separate taxon and has been misidentified with Actinaraea d’Orbigny, Microsolena Lamouroux, and Thamnasteria Lesauvage.
Distribution
- Southern Europe; Late Triassic
- Central Asia; Early Jurassic
- Western Europe; Late Cretaceous
This page has been in preparation since 18-Aug-2009 17:37
This version was contributed by Ewa Roniewicz on 27-Nov-2010 16:22.
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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