Dacryrina dziki Baliński and Sun, 2008

Sun, Yuanlin & Baliński, Andrzej, 2011, Silicified Mississippian brachiopods from Muhua, southern China: Rhynchonellides, athyridides, spiriferides, spiriferinides, and terebratulides, Acta Palaeontologica Polonica 56 (4), pp. 793-842 : 813

Dacryrina dziki Baliński and Sun, 2008

Fig. 13C .

1999 Rhynchonelloid gen. et sp. indet.; Baliński 1999: 445, fig. 4F, G. 2008 Dacryrina dziki n. sp.; Baliński and Sun 2008: 111–112, figs. 6, 7.

Material.—22 complete shells, two ventral and two dorsal valves from samples Mu−42, GB, and GT.

Remarks.—For a detailed description of the genus and species see Baliński and Sun (2008). This unusual micromorphic lambdarinoid differs from all members of the superfamily by lacking a bilobed shell outline. Instead, it is characterised by a tear−shaped elongate shell and by having a long, straight, tube−like ventral umbo, which is narrowly triangular in outline as in Lambdarina . Internally, the Chinese form is also virtually identical to Lambdarina . It is noteworthy that including the genus Dacryrina into the superfamily Lambdarinoidea leads to expand the diagnosis of the superfamily in order to include not bilobed, elongate tear−shaped forms. Baliński and Sun (2008) have commented on a presumable life habit of Dacryrina dziki and other co−occurring lambdarinids in the Muhua Formation as did Brunton and Champion (1974) for their species from the Viséan of Staffordshire, England.

Figures

Fig. 13. Lambdarinoid brachiopods from the Tornaisian Muhua Formation, southern China. A. Lambdarina sinensis Baliński and Sun, 2008 (figured in Baliński and Sun 2008: fig. 3K–P), holotype ZPAL V.XXVI/26, shell in dorsal (A1), ventral (A2), lateral (A3), posterior (A4), anterior (A5), and oblique lateral (A6) views. B. Hampsia cooperi Morris, 1994, PKUM02−0434, shell in dorsal (B1), lateral (B2), and posterior (B3) views. C. Dacryrina dziki Baliński and Sun, 2008, PKUM02−0435, shell in dorsal (C1), lateral (C2), posterior (C3), and anterior (C4) views.All SEM micrographs. Samples Mu−42 (A), D (B), and GB (C).