Coeloterorhynchus Sartenaer, 1966

Ma, Xue-Ping, Becker, Ralph Thomas, Li, Hua & Sun, Yuan-Yuan, 2006, Early and Middle Frasnian brachiopod faunas and turnover on the South China shelf, Acta Palaeontologica Polonica 51 (4), pp. 789-812 : 796

Genus Coeloterorhynchus Sartenaer, 1966 Coeloterorhynchus sp.

Fig. 4E .

Material.— Four specimens from the Caiziyan section. Samples: GC24 (1 specimen), GC23 (1 specimen), GC21–24 (1 specimen),? GC8–9 (1 specimen) .

Discussion.—The studied specimens have four costae on fold, three costae in sinus, and two to three costae on each flank, which diminish in strength laterally. As no internal structures are available, shells are tentatively assigned to Coeloterorhynchus by external morphology, which is very similar to the type species of the genus ( Sartenaer 1966: pl. 2: 2). It is different from superficially similar Porostica zhonghuaensis Chen in Xu et al. (1978) and Calvinaria beichuanensis Chen in Xu et al. (1978) from the Early Frasnian of the Longmenshan area in having a smaller size, a less transverse shell, and higher tongue.

Occurrence.—Same as previous. The present species occurs in Beds 21–24 (and also?Middle Givetian beds 8–9) of the Caiziyan section, approximately Pa. transitans Zone.

Figures

Fig. 4. Strophomenid and rhynchonellid brachiopods from the Early and Middle Frasnian of the Panxi and Caiziyan sections. A. Sulcatostrophia? bunapica Veevers, 1959a, PUM05001, sample PY5, Panxi section, Middle Frasnian, dorsal (A1), ventral (A2), area (A3) views, and enlargement of framed area in image A1 (A4). B. Phlogoiderhynchus squamosus (Wang, 1956), PUM05002, sample PY3, Panxi section, Early Frasnian, dorsal (B1), lateral (B2), and posterior (B3) views. C. Phlogoiderhynchus depressus (Wang, 1956), PUM05003, sample PY2, Panxi section, Early Frasnian, dorsal view. D. Pugnax cf. triplicata (Chen in Xu et al. 1978), PUM05004, sample GC20, Caiziyan section, Early Frasnian, lateral (D1: ventral beak broken), dorsal (D2), and anterior (D3: left anterior broken, right lateral anterior slightly broken) views. E. Coeloterorhynchus sp., PUM05005, sample GC21−24, Caiziyan section, Early Frasnian, dorsal (E1: right anterior and right lateral broken), posterior (E2), and lateral (E3) views.