COMMENTS ON SOME SYRINGOTHYRIDOIDEA (BRACHIOPODA) FROM THE CARBONIFEROUS OF NORTH AFRICA

MOTTEQUIN, B.; CISTERNA, G.A.

RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA

UNIV STUDI MILANO

Lugar: Milan, Italia; Año: 2019 vol. 125 p. 789 - 804

0035-6883

The type species of the spiriferinide genus Histosyrinx Termier & Termier (Brachiopoda), namelyHistosyrinx vautrini Termier & Termier, is re-investigated in detail on the basis of its type material from the TournaisianMarar Formation (Serdeles area, Murzuq Basin, Libya), including additional specimens from the same region, andfrom the Tournaisian of Algeria (Reggane Basin). The internal morphology of the ventral valve of Histosyrinx vautriniis particularly variable, notably concerning the development of the septal pillow, the subdelthyrial plate and the medianseptum. Histosyrinx can be easily distinguished from the genus Septosyringothyris Vandercammen by the absenceof a true delthyrial plate and the lesser development of the median septum. Histosyrinx is also close to SyringopleuraSchuchert, which is generally considered as a synonym of Syringothyris Winchell, by its ventral internal features (e.g.development of a septal pillow), but the dorsal internal morphology of the type species of Schuchert?s genus remainsunknown. Thus, the relationships between both genera need to be investigated further. Specimens from the southernmargin of the Tindouf Basin (Algeria), previously identified as Septosyringothyridinae? gen. indet. by Legrand-Blainin the 1970s, are fully illustrated here for the first time and referred to an unidentified genus of the subfamily Permasyrinxinaeon the basis of the absence of syrinx