Family Remopleurididae Hawle & Corda, 1847

Remopleuridid gen. et sp. indet.

Figs 8.7, 10

1917 Remopleurides aff. latus Olin; Reed, p. 41, pl. 6, figs 9,10.

Material. Cranidium, Fig. 8.7 (Reed, 1917, pl. 6, fig. 9), GSI 11884; free cheek, Fig. 8.10 (Reed, pl. 6, fig. 10), GSI 11885; both specimens from the Shihtien Formation (Darriwilian) at Pupiao, western Yunnan.

Discussion. Reed (1917, p. 41) compared this species with one from the Chasmops limestone of Norway. Reed’s illustration of the cranidium shows the usual thin, arched glabellar furrows of remopleuridids; the cast figured here taken from the mould does not show such furrows, which are therefore probably visible only on the internal mould. We assume following Reed that the free cheek belongs with the cranidium, although the eye seems to be deeper than usual, and its inner profile does not closely match that of the palpebral lobes on the cranidium. However, the latter could be transversely extended through modest distortion. The number of remopleuridid genera in China has been increased as the former Remopleurides sensu lato has been subdivided. Zhou et al. (2016) recognised Hexacopyge and Disloboaspis alongside Remopleurides itself, in the Pagoda Formation, for example. Details of the hypostome are crucial to discriminate these clades, and since that feature is lacking in Reed’s collection it must remain in open nomenclature.