Krasiestheria parvula, Olempska, 2004

Olempska, Ewa, 2004, Late Triassic spinicaudatan crustaceans from southwestern Poland, Acta Palaeontologica Polonica 49 (3), pp. 429-442 : 440

Krasiestheria parvula gen. et sp. nov.

Fig. 11 .

Holotype: ZPAL Cr. 6/5, right valve ( Fig. 11 ).

Derivation of name: From the Latin parvulus, very small.

Type horizon and locality: Late Triassic, late Carnian, Krasiejów,southwestern Poland.

Diagnosis.—As for the genus.

Material.—Two valves.

Description.—Carapace of small size, up to 2.5 mm long and up to 1.6 mm high; subcircular in outline; anterior and posterior high nearly equal; dorsal margin straight; umbo of moderate size, 0.54 mm long, situated between its central and anterior end; anterior and posterior margins rounded, ventral margin curved; growth bands flattened, 14 in number, ornamented by radial striae occupying lower part of each growth band, upper parts of growth bands are finely punctated; width of interspace between growth lines gradually increasing from larval toward mature stage.

Remarks.— Krasiestheria parvula is characterized by its subcircular carapace, radial lines and punctate ornamentation of its growth bands, it is clearly distinct from any other described spinicaudatan species.

Occurrence.—Late Carnian, Krasiejów, Poland.

Figures

Fig. 11. Krasiestheria parvula gen. et sp. nov. Right valve ZPAL Cr. 6/5, holotype, in lateral view (A); in ventral view (B); the same with details of dorsal area (C); and details showing growth bands ornamentation, minute punctae pattern in upper part of each growth band and radial striae in lower part of each growth band (D–F).