Striispirifer, Cooper and Muir-Wood, 1951

Popov, Leonid E., Hairapetian, Vachik, Pour, Mansoureh Ghobadi & Modzalevskaya, Tatiana L., 2015, A new, unusual rhynchonellide brachiopod with a strophic shell from the Silurian of Iran, Acta Palaeontologica Polonica 60 (3), pp. 747-754 : 752

Striispirifer ? ocissimus Popov, Modzalevskaya, and Ghobadi Pour in Hairapetian et al., 2012

Figs. 3D, E , 4 .

2012 Striispirifer ? ocissimus Popov, Modzalevskaya, and Ghobadi Pour 2012; Hairapetian et al. 2012: 101, figs. 6R-T, 11.

Material.—AEU1510–1512, NMW 2011.11G.457–469. Total six pairs of conjoined valves and nine ventral valves.

Remarks.—Specimens from the Telychian have spiralia with up to seven whorls. Except for their smaller size, these shells are morphologically identical to those of Striispirifer ? ocissimus from the underlying Aeronian deposits ( Hairapetian et al. 2012) and are considered here as conspecific.

Stratigraphic and geographic range.—Niur Formation, Aeronian, Llandowery, Silurian, Central Iran.

Figures

Fig. 3. Rhynchonellide brachiopod Jafarirhynchus alatus gen. et sp. nov. (A–C) and spiriferide Striispirifer? ocissimus Popov, Modzalevskaya, and Ghobadi Pour in Hairapetian et al., 2012 (D, E) from Niur Formation, Telychian, Llandovery, Silurian, sample K33/1, Boghu Mountains. A. AEU1500, holotype, a pair of conjoined valves, in dorsal (A 1), ventral (A 2), lateral (A 3), and anterior (A 4) views, enlarged ventral interarea (A 5). B. AEU1501, a pair of conjoined valves, in anterior (B 1), ventral (B 2), dorsal (B 3), and lateral (B 4) views of a strongly asymmetrical specimen. C. AEU1502, dorsal view of a pair of conjoined valves (C 1), enlarged surface ornament (C 2). D. AEU1511, a pair of conjoined valves, in ventral (D 1), lateral (D 2), and dorsal (D 3) views. E. AEU1512, ventral valve exterior. Scale bars 2 mm.

Fig. 4. Transverse serial sections of a cyrtioid spiriferid brachiopod Striispirifer? ocissimus Popov, Modzalevskaya, and Ghobadi Pour in Hairapetian et al., 2012; NMW 2011.11G.457 from Llandovery, Telychian, Niur Formation, sample K33/1, Boghu Mountains. Numbers indicate distance in mm from the tip of the ventral umbo.