Scabriscutellum sp.

Scabriscutellum sp.

Text-fig. 4d

M a t e r i a l. One fragment of pygidium, internal mould;

(?) minute fragment of cranidium.

R e m a r k s. One fragment of scutelluid pygidium possesses typically narrow ribs and wide inter-rib furrows, but lacks the pygidial marginal spines (pygidial posterolateral margin is smooth). It corresponds to the Scabriscutellum ( Scabriscutellum) and/or Scabriscutellum ( Cavetia) PILLET, 1973 . As no other material is available, the specimen is left in open nomenclature. It is, however, most probable that the specimen belongs to the S. ( S.) caelebs caelebs ( BARRANDE, 1852), known from the Acanthopyge Limestone (see Vaněk and Valíček 2002 but not Šnajdr 1960 and Chlupáč 1983 – these authors affiliated occurrence of this taxon to the older Suchomasty Limestone; original and supplementary material of Šnajdr stored in Czech Geological Survey collections is nonetheless correctly affiliated to the Acanthopyge Limestone by author himself). Chlupáč (1983: 60, pl. 5), has mentioned a rare occurrence of Scabriscutellum (different than S. ( S.) caelebs caelebs?) in Acanthopyge Limestone. The middle rib of the studied specimen slightly widens anteriorly, while in S. ( S.) caelebs caelebs it narrows anteriorly ( Šnajdr 1960: pl. 26, figs 4, 8–9)