Wang et al.—Silurian amplexoid rugose corals from South China 92(6):982–1004


987


Figure 5. Pilophyllia fenggangensis Ge and Yu, 1974, holotype: (1, 2) longitudinal section (NIGP 22086) and an enlarged portion (2); (3–5) transverse section (NIGP 22085) and two enlarged portions (4, 5). Scale bars=2mm.


genus being type of the family Amplexidae Chapman, 1893. Amplexoididae n. fam., typified by Amplexoides, is introduced for the Silurian amplexoid rugosan genera listed above, which are only superficially similar and clearly phylogenetically unrelated to amplexoid forms from Devonian or younger strata, such as Mississippian Amplexus Sowerby, 1814, particularly in relation to their septal microstructure.


Genus Pilophyllia Ge and Yu, 1974


1974 Pilophyllia Ge and Yu, p. 170. 1974 Pilophylloides Ge and Yu, p. 167. 1974 Pilophylloia Ge and Yu, p. 170. 1975 Ningqiangophyllum Cao, p. 184 (in part). 1977 Amplexoides Wang [1947]; McLean, p. 31. 1978 Pilophyllia ‘Yu and Ge’; He, p. 117. 1981 Pilophyllia; Hill, p. F173.


1982 Protopilophyllum Ivanovsky [1963]; Cao and Lin, p. 13 (in part).


Type species.—Pilophyllia involuta Ge and Yu, 1974, Ningqiang Formation (middle Telychian), Ningqiang County, Shanxi Province, by original designation.


Other species.—Pilophyllia angusta (Cao, 1975); P. conica Tang in Tang et al., 2007; P. fenggangensis; P. intermedia (Cao, 1975); P. simplex Chen in Wang et al., 1986; P. stylaris Tang in Tang et al., 2007; P. tenuiseptata; P. ultimuma Tang in Tang et al. 2007; and P. vesiculosa Tang in Tang et al., 2007.


Pilophyllia simplex (holotype and one paratype, Ningqiang


Formation, middle Telychian, Dazhuba, Ningqiang County, Shanxi Province) is also reportedly present in the Shihniulan Formation (Aeronian) of Xishui, northeastern Guizhou Pro- vince, and in the Sifengya Formation (early Telychian) of Daguan, northeastern Yunnan Province (Wang et al., 1986). It is closely similar to P. fenggangensis and P. angusta, but differs from the former in having a narrower peripheral stereozone and straight major septa, and from the latter in possessing a much smaller corallum and slightly longer major septa. One specimen (CUGB-GSL0141) from the Leijiatun Formation (Aeronian) of the Shiqian area, northeastern Guizhou, was illustrated by Tang et al. (2007) as P. simplex, although it differs from the holotype of that species in having shorter major septa. Pilophyllia ultimuma (holotype and one paratype, Xiang-


shuyuan Formation, late Rhuddanian to early-middle Aeronian, Shiqian, northeastern Guizhou; two paratypes from the Leijiatun Formation, Aeronian, same area) is characterized by possessing a small corallum, a wide peripheral stereozone, long and commonly involute major septa, and rejuvenescence. It is similar to P. fenggangensis but differs in having more major septa and rejuvenescence. One paratype (CUGB-GSL0711) is likely a representative of P. stylaris. Pilophyllia conica (holotype, basal Xiangshuyuan Forma-


tion, middle to late Rhuddanian, Shiqian, northeastern Guizhou; two paratypes, Leijiatun Formation, Aeronian, same area) is characterized by a small corallum, a conical external form, and thick, short major septa in tabularium. One paratype (CUGB- GSL0703) is likely a representative of P. stylaris.


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