Magniderbyia sp.

Chen, Zhong-Qiang, Campi, Monica J., Shi, Guang R. & Kaiho, Kunio, 2005, Post-extinction brachiopod faunas from the Late Permian Wuchiapingian coal series of South China, Acta Palaeontologica Polonica 50 (2), pp. 343-363 : 353-354

Magniderbyia sp. indet.

Fig. 7J.

Locality and horizon: Daijiagou section; 1 st member of the Lungtan Formation.

Remarks.—Although Magniderbyia has been placed as a junior synonym under Derbyia by Williams and Brunton (2000), this genus is distinguished from Derbyia by its significantly large size, wider hingeline that almost equals the shell width, and pair of large, laterally extending ears. Magniderbyia therefore is treated as a valid genus. This genus is represented by several external molds in the Daijiagou collections. Of these, a ventral external mold (NMV P309628) is figured here to indicate the presence of Magniderbyia in the Wuchiapingian faunas. Our specimens approach both Me. lata Zhan, 1979 and Me. mucronata Liao, 1980b in fine, dense ribs and strongly laterally projecting cardinal extremities, however a meaningful comparison with these two species is difficult due to insufficient material. Like Magniderbyia , Derbyia regis Grant, 1995 from the Upper Permian of Hydra Island, Greece also has a transverse outline and a hingeline equating the shell width. However, the Greek species possesses rounded extremities rather than the laterally projecting ones of Magniderbyia .