Fig. 17 in Silicified Mississippian brachiopods from Muhua, southern China: Rhynchonellides, athyridides, spiriferides, spiriferinides, and terebratulides

Fig. 17. Athyridoid brachiopod Cleiothyridina tenuilineata (Rowley, 1900) from the Tornaisian Muhua Formation, southern China. A. Complete juvenile shell, PKUM02−0451, in dorsal (A1), ventral (A2), lateral (A3), and anterior (A4) views. B. Dorsal valve, PKUM02−0452, exterior (B1) and interior (B2). C. Interior of ventral valve, PKUM02−0453, with preserved broken off umbonal region of the dorsal valve (cardinalia viewed from below), in general (C1) and enlarged (C2) views. D. Juvenile shell, PKUM02−0454, in dorsal (D1), ventral (D2), lateral (D3), anterior (D4), and posterior (D5) views. E. Comlete shell, PKUM02−0455, with adhered some silica deposits in dorsal view. F. Well preserved cardinalia, PKUM02−0456. G. Shell, PKUM02−0457, in dorsal (G1), ventral (G2), lateral (G3), and anterior (G4) views. H. Dorsal valve, PKUM02−0458, in interior (H1), the same slightly inclined anteriorly (H2), and enlarged (H3) views. I. Shell, PKUM02−0459, in dorsal (I1), ventral (I2), lateral (I3), anterior (I4), and posterior (I5) views. J. Complete shell, PKUM02−0460, in dorsal view. K. Shell, PKUM02−0461, with preserved spine−like outgrowths in dorsal (K1) and enlarged (K2) views. L. Complete shell, PKUM02−0462, in dorsal (L1), ventral (L2), lateral (L3), and posterior (L4) views. M. Complete shell, PKUM02−0463, in dorsal view. N. Damaged shell, PKUM02−0464, viewed from the anterior showing preserved spiralium with labelled details. O. Enlargement showing well preserved surface micro−ornamentation; note concentric lamellae desintegrating to spine−like outgrowths (arrowed), PKUM02−0399; see also Fig. 4J. All from sample MH1.