Fig. 18 in Silicified Mississippian brachiopods from Muhua, southern China: Rhynchonellides, athyridides, spiriferides, spiriferinides, and terebratulides

Fig. 18. Meristelloid brachiopod Muhuathyris circularis Sun, Ma, Baliński, and Zhang, 2004 from the Tornaisian Muhua Formation, southern China. A. Incomplete ventral valve, PKUM02−0465, in general interior view (A1), enlargement of umbonal region showing left tooth (A2), and enlarged interior in slightly oblique view showing spondylium supported by median septum (A3). B. SEM micrograph of the interior of an incomplete dorsal valve, PKUM02−0466, in oblique−lateral view with labelled morphology (partly after Sun et al. 2004b: fig. 1−25). C. Incomplete dorsal valve, PKUM02−0467, in oblique view showing cardinalia. All from sample MH1.