Petrobrasia diversicostata Krömmelbein, 1965

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 : 38

Petrobrasia diversicostata Krömmelbein, 1965

Fig. 8 , 11a–c

1965b Petrobrasia diversicostata n. sp. —Krömmelbein, p. 65–66, pl. 2, fig. 6.

Diagnosis: A Petrobrasia species with striking sculpture of strong and fine ridges or ribs on both valves: a strong dorsal ridge and a ventral ridge are joined over the posterior margin into a recumbent V; a rather weaker short ridge marks the central valve area; the valve field between the strong ridges shows finer little ridges, which run more or less parallel to the strong ones. Dorsally and ventrally to the “recumbent V” fine ridges run parallel to the relevant valve edges.

Holotype: Carapace, SMF Xe 5382.

Paratypes: Not deposited.

Dimensions: Holotype, length 0.93mm, height 0.50mm, width 0.30mm.

Figures

FIGURE 8.

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.