Paracypridea, Swain, 1946

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 : 19

PARACYPRIDEA Swain, 1946

Type Species: Cypridea (Paracypridea) obovata Swain, 1946

Diagnosis (new version): Carapace mostly large. Right valve always larger than left valve. Rostrum small to almost indistinguishable, strongly bent back and clinging closely to the carapace outline. The rostral groove is mostly only slightly defined. Rostral sulcus weakly developed. Carapace surface in general smooth, seldom with marked sculpture like pits, wrinkle sculpture or strong nodes. The distinguishing internal carapace features are still insufficiently known: hinge presumably simple (hinge fold) without teeth. Central scar field consists mostly of six individual scars; four extended rectangles at the front in a curved row, two behind. Calcified marginal zone of the inner valve lamella quite broad. Fused zone broad; pore canals numerous, narrow, presumably simple, individually not yet more exactly known, but presumably deviating from Cypridea . Many species with carapace (sexual?) dimorphism in the form of characteristic inflexing of the carapace margin on the upper posterior margin or in the form of tongue-like projections of the (smaller) left valve over the right valve on the lower part of the posterior margin; some species without carapace dimorphism.

Remarks (Bate et al. herein): Seven previously described ‘species’ figured by Krömmelbein (1962), material: SMF Xe 4152-4164, are not imaged in the present paper.