Pliensbachian corals from the Western Tethys Author Vasseur, Raphaël Université de Lorraine, CNRS, lab. GeoRessources, UMR 7359, BP 70239, F- 54506 Vandoeuvre-lès-Nancy cedex (France) raphaelvasseur@wanadoo.fr Author Lathuilière, Bernard Université de Lorraine, CNRS, lab. GeoRessources, UMR 7359, BP 70239, F- 54506 Vandoeuvre-lès-Nancy cedex (France) bernard.lathuiliere@univ-lorraine.fr text Geodiversitas 2021 2021-11-23 43 22 1187 1291 journal article 10.5252/geodiversitas2021v43a22 1638-9395 5764379 urn:lsid:zoobank.org:pub:6D1643AD-66A5-4678-9397-CE08E610D641 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.