Spinatrypina lungkouchungensis ( Tien, 1938 )

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 : 803-804

Spinatrypina lungkouchungensis ( Tien, 1938)

Fig. 10H, I .

1938 Atrypa douvillii var. lungkouchungensis Tien (var. nov.); Tien 1938: 97–98, pl. 13: 14–16.

Material.— Four specimens. Samples: QZQ1–3 (2 specimens), QZQ3 (1 juvenile), QZQ4 (1 specimen). QZQ1–3 and QZQ3 , Qiziqiao section, Middle Frasnian; QZQ4 , Qiziqiao section, probably Late Frasnian .

Discussion.— Tien (1938) described one species and a variety of the same species of Spinatrypina from the same sample of the Lungkouchung (now spelled Longkouchong) section: Atrypa douvillii var. lungkouchungensis Tien, 1938 and A. douvillii Mansuy, 1912 . The former is characterized by an elongated outline, with the ventral valve being more convex than the dorsal valve; the latter is characterized by a somewhat biconvex profile and subrounded outline. Because of few specimens (both Tien’s original and our new collections), it is difficult to determine at this stage if these differences represent intraspecific variation or are two species.

The studied specimens are not sufficiently well preserved to show the overall morphology except the juvenile ( Fig. 10I ) that has a slightly elongated outline. They are all assigned to Spinatrypina lungkouchungensis ( Tien, 1938) .

Occurrence.—So far the present species has been only reported from the Qiziqiao section, correlated with the Palmatolepis hassi to lower part of the Early Pa. rhenana conodont zones.

Figures

Fig. 10. The spinatrypinae brachiopods from the Early and Middle Frasnian of the Caiziyan and Qiziqiao sections. A, B. Spinatrypina douvillei (Mansuy, 1912). A. PUM05018, sample GC21–24, Caiziyan section, Early Frasnian, dorsal view of an exfoliated specimen on slab. B. PUM05019, sample GC21–24, Caiziyan section, Early Frasnian, dorsal view of another exfoliated specimen on slab. C–G. Spinatrypa subkwangsiensis (Tien, 1938) Group B. C. PUM05020, sample QZQ1–3, Qiziqiao section, Middle Frasnian, dorsal view of an exfoliated specimen on slab. D. PUM05021, sample QZQ4, Qiziqiao section, probably Late Frasnian, dorsal (D1), lateral (D2), ventral (D3), posterior (D4), and anterior (D5) views of an adult(?), note spiny bases and broken spines. E. PUM05022, sample QZQ4, Qiziqiao section, probably Late Frasnian, posterior (E1), anterior (E2), ventral (E3), dorsal (E4), and lateral (E5) views of another adult (?) with a well preserved foramen bounded by a pair of conjunct deltidial plates at the bottom. F. PUM05023, sample QZQ4, Qiziqiao section, probably Late Frasnian, dorsal (F1), ventral (F2), lateral (F3), posterior (F4), anterior (F5), and enlarged area (F6) views of a juvenile with a well preserved foramen bounded by a pair of conjunct deltidial plates at the bottom. G. PUM05024, sample QZQ4, Qiziqiao section, probably Late Frasnian, anterior (G1), posterior (G2), dorsal (G3), ventral (G4), and lateral (G5) views of another juvenile. H–I. Spinatrypina lungkouchungensis (Tien, 1938). H. PUM05025, sample QZQ4, Qiziqiao section, probably Late Frasnian, ventral view, specimen is on slab. I. PUM05026, sample QZQ3, Qiziqiao section, Middle Frasnian, dorsal (I1), lateral (I2), ventral (I3), and anterior (I4) views of a juvenile.