Petrobrasia vallata Krömmelbein & Weber, 1971

Bate, Raymond H., Horne, David J., Horne, Sarah E., Douglas, Lyndsey, Miller, Giles & Lord, Alan R., 2022, Non-marine Ostracoda (Crustacea) of the Early Cretaceous ‘ Pre-Salt’ sediments of Brazil: An illustrated catalogue of the type specimens of Wicher, Krömmelbein, Krömmelbein & Weber, and Bate, Zootaxa 5098 (1), pp. 1-84 : 48-49

Petrobrasia vallata Krömmelbein & Weber, 1971

Fig. 11, 11a–c

1971 Petrobrasia vallata n. sp. —Krömmelbein & Weber, p. 42–43, pl. 7, fig. 32.

Diagnosis: A Petrobrasia species from the diversicostata -group with the following peculiarities: carapace in lateral outline well rounded, the posterior margin fairly bluntly truncated. Sculpture: a hook-shaped ridge accompanies the ventral margin for its entire length, turns off sharply in the antero-dorsal direction at the posterior margin and ends just before the centre of the valve. The area of the central muscle-field can be raised like a knob or short ridge (mostly on the right valve). The hook-shaped ridge encloses the central valve area, which is embellished with irregularly reticulate, slightly bent or sharply bent longitudinal ribs.

Holotype: Carapace, BfB 7805.

Paratypes: Not deposited.

Dimensions: Holotype, length 0.77mm, height 0.40mm, width 0.21mm.

Figures

FIGURE 11. a = left lateral, b = dorsal, and c = right lateral views. 1a–c. Hourcqia africana africana Krömmelbein, 1965. Topotype, C, BfB 7793, l 0.97mm, h 0.62mm, w 0.47mm. 2a–c. Hourcqia africana confluens Krömmelbein & Weber, 1971. Holotype, C, BfB 7794, l 1.05mm, h 0.71mm, w 0.50mm. 3a–c. Hourcqia angulata angulata Krömmelbein & Weber, 1971. Holotype, C, BfB 7795, l 0.86mm, h 0.58mm, w 0.42mm. 4a–c. Hourcqia angulata sinuata Krömmelbein & Weber, 1971. Holotype, C, BfB 7796, l 0.78mm, h 0.54mm, w 0.37mm. 5a–c. Hourcqia angulata symmetrica Krömmelbein & Weber, 1971. Holotype, C, BfB 7797, l 1.12mm, h 0.72mm, w 0.58mm. 6a–c. Hourcqia angulata salitrensis Krömmelbein & Weber, 1971. Holotype, C, BfB 7798, l 1.14mm, h 0.77mm, w 0.64mm. 7a–c. Petrobrasia tenuistriata longiuscula Krömmelbein & Weber, 1971. Holotype, C, BfB 7799, l 1.12mm, h 0.57mm, w 0.36mm. 8a–c. Petrobrasia? badajosensis Krömmelbein & Weber, 1971. Holotype, C, BfB 7800, l 0.88mm, h 0.52mm, w 0.34mm. 9a–c. Petrobrasia? gutta Krömmelbein & Weber, 1971. Holotype, C, BfB 7801, l 0.79mm, h 0.48mm, w 0.35mm. 10a–c. Petrobrasia capivarensis Krömmelbein & Weber, 1971. Holotype, C, BfB 7802, l 0.97mm, h 0.60mm, w 0.34mm. 11a–c. Petrobrasia vallata Krömmelbein & Weber, 1971. Holotype, C, BfB 7805, l 0.77mm, h 0.40mm, w 0.21mm. 12a–c. Salvadoriella? pusilla Krömmelbein & Weber, 1971. Holotype, C, BfB 7808, l 0.57mm, h 0.27mm, w 0.24mm.