Palaeozygopleura vesna Horný 1955

Holotype. NMP 34871 (Horný 1955: pl. III, fig. 3).

Paratypes. Two specimens NMP unnumbered.

Type locality. Section in a small quarry NE of the village of Holynĕ and W of the Prastav quarry (50°1'57.627"N, 14°21'5.471"E).

Type horizon. Uppermost part of Třebotov Limestone (Daleje-Třebotov Formation); the latest Emsian to early Eifelian, Middle Devonian.

Remarks. Only three incomplete shells of this species are known; they were collected by F. Prantl from weathered beds in uppermost part of the Třebotov Limestone. Its shell morphology shows some resemblance with the older P. vaneki, but the latter differs from P. v e s n a by a higher number of costae, which are also more asymmetrically curved. Paleozygopleura vesna has two-edged costae (Horný 1955: 38, pl. 3.3), but costae in P. vaneki have a triangular profile (Frýda et al. 2008: fig. 1H).

Stratigraphic and geographic distributions. This rare species is only known from its type horizon and locality.