Schizocrania multistriata ( REED , 1905)

Mergl, Michal & Nolčová, Lucie, 2016, Schizocrania (Brachiopoda, Discinoidea): Taxonomy, Occurrence, Ecology And History Of The Earliest Epizoan Lingulate Brachiopod, Fossil Imprint 72 (3 - 4), pp. 225-238 : 228

Schizocrania multistriata ( REED, 1905)

Pl. 1, Figs 1–15

1905 Trematis multistriata , sp. nov.; Reed, p. 446, pl. 23, figs 1, 1a.

1972 Ptychopeltis sp. n.; Havlíček, p. 233, pl. 2, figs 4, 5.

1974 Schizocrania salopiensis sp. nov.; Williams, p. 44, pl. 6, figs 22–26.

1978 Trematis multistriata REED ; Cocks, p. 25.

1978 Schizocrania salopiensis WILLIAMS ; Cocks, p. 26.

1979 Schizocrania salopiensis WILLIAMS ; Hurst, p. 229, figs 72–77.

1981 Schizocrania cf. salopiensis WILLIAMS ; Lockley and Willliams, p. 24, figs 60–65.

1981 Schizocrania multistriata (REED) ; Lockley and Willliams, p. 24, figs 66.

1996 Ptychopeltis salopiensis (WILLIAMS) ; Havlíček and Vaněk, p. 234, pl. 1, figs 1, 2, pl. 2, fig. 1.

2000 Schizocrania multistriata (REED) ; Sutton et al., p. 83, pl. 13, figs 11–13, pl. 14, figs 1–7.

2008 Schizocrania multistriata (REED) ; Cocks, p. 22.

D e s c r i p t i o n o f B o h e m i a n m a t e r i a l.

Havlíček and Vaněk (1996) and Mergl (2002).

R e m a r k s. Newly sampled ventral valves and re-examination of specimens from the Dobrotivá Formation prove that the ventral valve of the specimens from the Barrandian area lacks the radial costellation, and the pedicle notch is parallel-sided and gently tapering posteriorly. Although this differentiates the Bohemian specimens from the British ones ( Sutton et al. 2000: pl. 14, fig. 4), we prefer to maintain the name S. multistriata ( REED, 1905) for the Barrandian specimens. Similarly to the British specimens ( Sutton et al. 2000: 84), the variation of density of costellae is remarkably high in the Barrandian specimens (Pl. 1, Figs 5, 6). New costellae originate exclusively by intercalation (Pl. 1, Fig. 4). Unlike the stratigraphically younger species, the costellae of S. multistriata from the Barrandian area are wider than the interspaces, and the interspaces have concave profiles (Pl. 1, Fig. 4). The type specimens of S. multistriata came from the Darriwilian of Pembrokeshire in Wales (uppermost Llandeilian or lowermost Aurelucian: Cocks (2008)) and that is of comparable age to the Bohemian specimens.

O c c u r r e n c e. In the Barrandian area, the species is very rare in the Šárka Formation (lower Darriwilian) (locality: Osek (field)), and moderately common in the Dobrotivá Formation (upper Darriwilian) (localities: Ejpovice (highway cut, quarry, temporary excavations in industrial park), Kařízek (Veronika mine), Malé Přílepy (field), Osek (highway cut), Praha – Liboc (temporary excavations), Praha – Motol (railway cutting), Praha – Vokovice (field), Sedlec (Sutice, well excavations in village), Starý Plzenec (Černá stráň)). In England and Wales, the species occurs sporadically (about 50 shells are known, mostly in argillaceous rocks) from the latest Fennian (Arenig) to lowermost Caradoc (= latest Dapingian? to early Sandbian) ( Sutton et al. 2000).