Chevalieria
Melnikova, 1984:49
Type Species
Chevalieria grandis Melnikova, 1984:48; Monotypy Melnikova, 1984:49
Type Specimen: Holotype; PIN 4598/66; Verified; Dry Preserved
Type Locality: Pass Karakul'ashu, SE Pamirs. Bortepa suite, Rhaetian, Late Triassic
The type material, no.20/77, originally housed at the collections of the MUGT (Department of Geology, Council of Ministers, Tajik SSR, Dushanbe), has been transmitted to the PIN (Paleontological Institute, Academy of Sciences, Moscow). The species is distributed in Rhaetian two suites, Bortepa and Djilgakochusu, SE Pamirs, and in Rhaetian Khouz-Khan suite, Central Iran.
Diagnosis
Thamnasterioid. Increase intracalicular. Radial elements biseptal, composed of thick trabeculae marked as rows of granules on septal sides, and arranged in divergent systems. Distal septal border covered with rounded denticles; septal faces regularly covered with long menianes having smooth, subhorizontally oriented edge; menianes distributed alternalety on both sepal sides. Columella rudimentary, made of trabecular septal offsets. Endotheca vesicular.
Description
Well described and illustrated in Melnikova 2001:66, pl. 20, fig.1; pl.21, fig. 1.
Comparisons
The genus resembles Pamiroseris Melnikova and Cuifastraea Melnikova in thamnasterioid colony and corallites with thin, numerous septa. From Pamiroseris differs in having menianes, from Cuifastraea differs in smooth edges of menianes, which signifies differences in the microstructure.
Remarks
Two species have been described. The Anisian species (Morycowa 1989:110,text-fig. 10 A,B; pl.9, fig. 1a,b, 2a-c)is assigned to the genus with a question mark, because of a possible granulation of the edges of menianes.
Distribution
- Central Europe; Middle Triassic
- Central Asia; Late Triassic
The genus known from the Anisian (Europe, Silesia) to the Rhaetian (Central Asia).This page has been in preparation since 25-Apr-2009 11:24
This version was contributed by Ewa Roniewicz on 09-Nov-2010 15:40.
Page authors are: Ann Budd Francesca Benzoni. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Ewa Roniewicz
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