Melnikova, 1987, p. 32
Thamnasteriamorpha dronovi Melnikova, 1971, p. 32, pl. 2, fig. 1a-1д; Original Designation
Type Specimen: Holotype; TAD N 24/564-3VI; Verified; Dry Preserved
Type Locality: North-Western Afghanistan, environs of city Herat, Norian, LateTriassic
Also in Melnikova 1975: 121, pl. 27, fig. 1a-1г; pl. 28: figs.1, 2; pl. 29, fig. 2.
Colonial, thamnasterioid, budding mostly circumoral. Radial elements costoseptal. Mid-septal zone with more or less individualized centers of 100-200 μm in diameter. Trabeculae vertical at corallite periphery, while at inner edges inclined to corallite centers. Lateral septal micromorphology pennular with a tendency to form menianes; pennulae distributed symmetrically on septal sides. Columella styliform. Dissepiments vesicular, abundant.
Up to now, two species were described by Melnikova 1975 and 1987: A. dronovi and A. karapetovi, the second one differing from the type species in smaller number of septa per calice and in protocorallite similar in diameter to other calices.
From Astraeomorpha Reuss, 1854, the genus differs in 2-4 times larger diameters of trabeculae, pennular septal ornamentation and thick columella. The genus differs from Thamnasteriamorpha Melnikova, 1971 (type species: Thamnastraea frechi Volz, 1896) in its originally pennular septal micromorphology.
- Central Asia; Late Triassic
This page has been in preparation since 22-Aug-2013 15:59
This version was contributed by Ken Johnson on 22-Aug-2013 16:27.
Page authors are: Ewa Roniewicz. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Ewa Roniewicz