Melnikova created a new generic name Quenstedtiphyllia for Hexastraea fritshi Volz; genus Hexastraea Volz,1896 is a junior homonym of Hexastraea Bellardi in Sismonda 1871.
Hexastraea fritschi Volz, 1896:91; Monotypy Melnikova, 1975:106
Type Specimen: Holotype; MLU.Vol1896.1; Verified; Dry Preserved
Type Locality: St Cassian, Dolomites, Southern Alps. Carnian, Late Triassic
Phaceloid amphiastreid with one-zonal (tabular) endotheca. Septal apparatus in quasi-radial symmetry. Increase by pocket-budding.
Decsribed and illustrated in Melnikova 1975 and, under the name of Pachysolenia mardjanaica, in 2001:36,pl.6,fig.1.
Similar to Pachysolenia in phaceloid corallum, radial symmetry and tabular endotheca, but differing from it in the type of budding - pocket-budding in Quenstedtiphyllia while lateral in Pachysolenia, and in the microstructure of septa and wall. In Pachysolenia septa ddo not show show separated centers and the wall is built of modules centered along subhorizontal axes; in Quenstedtiphyllia the centers in septa are discernible, and modules are centered on the wall.
The features of the genus were discussed in Roniewicz and Stolarski 2001, and phylogeny of the family Amphiastraeidae outlined. Two species are known.
Dolomites, Southern Alps, Carnian; South Eastern Pamirs, Carnian.
- Southern Europe; Late Triassic
- Central Asia; Late Triassic
This page has been in preparation since 30-Apr-2009 10:24
This version was contributed by Ewa Roniewicz on 10-Nov-2010 17:31.
Page authors are: Francesca Benzoni. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Ewa Roniewicz