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


Pilophyllia fenggangensis Ge and Yu, 1974 Figures 5, 6


v*1974 Pilophyllia fenggangensis Ge and Yu, p. 167, pl. 73, figs. 8, 9.


v.1975 Ningqiangophyllum involutum; Cao, p. 185, pl. 39, figs. 1a, b, 2a, b.


1978


Pilophyllia fenggangensis; Kong and Huang, p. 47, pl. 15, fig. 4a, b (refig. Ge and Yu, 1974, pl. 73, figs. 8, 9).


non 1978 Pilophyllia fenggangensis ‘Yu and Ge’; He, p. 118, pl. 59, fig. 7a, b.


v.1982 Protopilophylluminvolutum; Cao and Lin, p. 13, pl. 5, fig. 3a, b.


v.1986 Pilophyllia involuta; Wang et al., pl. 1, fig. 3a −d. ?2007


Pilophyllia fenggangensis; Tang et al., p. 103, pl. 3, figs. 3a− c, 4a− c.


Holotype.—NIGP 22085 (transverse section) and 22086 (long- itudinal section), Leijiatun Formation (Aeronian), Balixi, Fenggang County, Guizhou Province.


Diagnosis.—Like Pilophyllia involuta, but with medium-sized corallum and club-shaped rhabdacanths coated with thick lamellar stereomes.


Description.—Coralla solitary, ceratoid to cylindrical. Corallum diameter < 28mm. In one specimen (XACGS-G366), corallum height to 52mm with cup-shaped calice; interseptal ridges thin and densely spaced. Talons can develop. Marginarium a distinct peripheral stereozone, composed of


thick minor septa and thickened peripheral ends of major septa. Peripheral stereozone generally narrow in early stages, later gradually widening to 32% of corallum radius. Major septa amplexoid, thinning gradually at first, then rapidly becoming attenuate, and extending to axial region, where they can coil somewhat in one direction in late growth stage, without forming an axial structure (Figs. 5.3, 6.3, 6.11). Minor septa generally confined within stereozone. Cardinal septum short in an indistinct fossula. Trabeculae club-shaped, of rhabdacanthine type, coated by thick lamellar stereomes (e.g., Figs. 5.4, 5.5, 6.4, 6.7, 6.8, 6.10). Tabulae mostly complete, subhorizontal, or slightly arched with broad central platform and narrow down- turned margins. Tabular spacing irregular, commonly 9 −13, rarely 5−8, tabulae in 5mm. Dissepiments absent.


Materials.—Apart from the holotype, two additional specimens of this specieswere also examined during this study, including one (XACGS-G366) originally designated the holotype of Ningqian- gophyllum involutum by Cao (1975), and the other (XACGS- G367), originally assigned to the paratype of this species, both from Ningqiang Formation (middle Telychian), Ningqiang and Mianxian counties, southern Shanxi Province.


Remarks.—Several forms, originally described as Ningqiango- phyllum involutum by Cao (1975), Protopilophyllum involutum by Cao and Lin (1982), and Pilophyllia involuta by Wang et al.


999


(1986), are regarded herein as synonymous with P. fenggan- gensis (see the discussion of P. involuta above). A further specimen, from the Daugan Formation (Aeronian


sis by Tang et al. (2007) fits well with the revised diagnosis of P. fenggangensis presented above in most aspects, except that the major septa aremuch shorter. Pending determination of variability, the two individuals are provisionally included in this species. Pilophyllia involuta shows close similarities to P. feng-


to early Telychian) of Banbiandu, Yanjin, northeastern Yunnan, was included in Pilophyllia fenggangensis by He (1978). However, it seems more appropriate to exclude it from the species due to its much shorter major septa and apparently wider-spaced tabulae. Septal microstructure of this individual needs to be investigated to make a firm identification. The material originally identified as Pilophyllia fenggangen-


gangensis, only differing as noted in the revised diagnosis given herein. Pilophyllia ultimuma also strikingly resembles P. fenggangensis but differs in having awider peripheral stereozone and apparent rejuvenescence. Although likely to eventually prove synonymous, P. ultimuma is regarded provisionally as separate from P. fenggangensis.


Pilophyllia tenuiseptata (Cao, 1975) Figures 7–9


v*1975 v1975


?1978 ?1978 1982


?1986 ?1989


Ningqiangophyllum tenuiseptata Cao, 1975, p. 184, pl. 37, fig. 1a−d.


v non 1975 Ningqiangophyllum tenuiseptatum irregulare Cao, p. 185, pl. 37, fig. 2a−c.


Ningqiangophyllum longiseptatum Cao, p. 185, pl. 37, fig. 3a−d.


Pilophyllia tenuiseptatus; He, p. 118, pl. 59, fig. 2a−c.


Pilophyllia tenuiseptatum irregularis; He, p. 118, pl. 59, fig. 5a, b.


p. 13, pl. 5, fig. 6a−d(refig. Cao, 1975, pl. 37, fig. 1a−d).


Protopilophyllum tenuiseptatum; Cao and Lin,


Pilophyllia tenuiseptata; He et al., pl. 3, fig. 8a, b, pl. 28, figs. 5 −12, pl. 29, figs. 1− 3.


Pilophyllia tenuiseptata irregularis; Wang et al., pl. 2, fig. 2a − c.


Holotype.—XACGS-G360, with two transverse sections and one longitudinal section, from Ningqiang Formation (middle Telychian), Ningqiang County, Shanxi Province.


Diagnosis.—Like Pilophyllia involuta, but with much smaller corallum. Major septa typically pinnately arranged, extending to axial region, but without forming a whorl. Cardinal septum short, prominent, in a broad fossula. Trabeculae absent to weakly developed; when present, club-shaped, very thin, of rhabdacanthine type, or with original microstructure unknown, coated by thick lamellar stereomes.


Description.—Coralla solitary, mostly cylindrical. Corallum diameter 18 −25mm. In one specimen (XACGS-G360),


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