Genus Phacelostylophyllum Melnikova, 1972

urn:lsid:zoobank.org:act: 540AF60F-BAF0-4DB9-9FE0-6A9 AD 494F951

SPECIES ORIGINALLY INCLUDED. —? Phacelostylophyllum pontebbanae (Volz, 1896), P. romerloana (Volz, 1896), “ P. caespitosa ” (Frech, 1890), P. pygmaeum (Frech, 1890) P. zitteli (Frech, 1890), P. karauldyndalaensis (Melnikova, 1972) .

TYPE SPECIES. — Stylophyllopsis zitteli Frech, 1890 (Frech 1890: 49, pl. 13, fig. 9-15, 17-24), original designation by Melnikova (1972: 59; p. 198 in the translated version of the Paleontological Journal).

REMARKS

The genus differs from solitary Stylophyllopsis Frech, 1890 by its generally phaceloid growth form which can transform into a subcerioid one. For a long time, the transition between solitary to phaceloid and subcerioid forms have been observed in the group Sylophyllopsis – Phacelostylophyllum . According to the aim of the study (taxonomic description or phylogenetic interpretation) several nomenclatural positions can be adopted. For instance Roniewicz & Michalík (1998) classify the phaceloid forms within the genus Stylophyllopsis that has the nomenclatural anteriority. We prefer to adopt the spectral nomenclature (see Lathuilière 1996) and the use of a morphogenus: Phacelostylophyllum mg.