Revision of Metriophyllum Milne-Edwards & Haime, 1850 and Lindstroemia Nicholson & Thomson, 1876 (Anthozoa, Rugosa, Devonian)
Rohart, Jean-Claude; Weyer, Dieter
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen Band 299 Heft 1 (2021), p. 1 - 28
169 Literaturangaben
veröffentlicht: Jan 29, 2021
Online veröffentlicht: Jan 22, 2021
Manuskript akzeptiert: Nov 19, 2020
Manuskript erhalten: Mar 1, 2020
ArtNo. ESP155029901000, Preis: 29.00 €
Abstract
Metriophyllum has already been “revised” several times (based on “topotypes” from Ferques, Boulonnais, northern France), but nobody was aware of the existence of two different homoeomorphic genera in the local Frasnian, and the wrong morphology (not identical with the lost lectotype) was chosen. New collections allow to propose a neotype for the type species Metriophyllum bouchardi Milne-Edwards & Haime, 1850 (middle Frasnian Ferques Formation). Main diagnostic features are: trabicular septal microstructure, triad formed by the antiseptum and its two neighbouring long minor septa (all other minor septa are short and become reduced during the calicular ontogenesis). The older “Metriophyllum-II” (lower Frasnian Beaulieu Formation) has no triad and will be revised as a new, not congeneric species in a separate publication. Lindstroemia had been proposed without locality data; hence, nobody could provide topotypes. Some originally included pseudocolumellate Ordovician and Silurian species are meanwhile transferred to Dalmanophyllum Lang & Smith, 1939 and Bodophyllum Neuman, 1969 (suborder Streptelasmatina). Nicholson’s type series (Royal Museum of Scotland, Edinburgh) is labelled “Erie, New York”. Later, these common non-columellate Rugosa (upper Hamilton Group, Givetian) were described as Stereolasma rectum (Hall, 1843) and Lopholasma carinatum Simpson, 1900. Two syntype sections are chosen as lectotype specimen of the type species Lindstroemia columnaris Nicholson & Thomson, 1876, thus declaring the genus as senior synonym of Lopholasma Simpson, 1900 – both now junior synonyms of Metriophyllum. Most published so-called Metriophyllum/Lindstroemia/Lopholasma species (Silurian–Permian) are very poorly known and must be restudied morphologically; for the moment they have – homeless like a nomen nudum – no reasonable definite generic place. The new taxonomy accepts a family Lindstroemiidae Počta, 1902 (synonyms: Metriophyllidae Hill, 1939, Stereolasmatidae Fomichev, 1953). Also suborder names, as used in today’s best handbooks, must be changed. The former Metriophyllina Spasskiy, 1965 lose their name-giving taxon and are renamed Cyathaxoniina Spasskiy, 1977. Metriophyllum becomes a member of the Zaphrentoidina Wang, 1950 (synonyms: Metriophyllina Spasskiy, 1965, Stereolasmatina Hill, 1981, Hapsiphyllina Nudds in Nudds & Löser, 2001).
Schlagworte
Ahermatypic Givetian–Frasnian corals • taxonomy • Cyathaxoniina • Zaphrentoidina (Metriophyllum, Lindstroemia, Lopholasma, Stereolasma) • morphology (metriophylloid carinae)