Tucanocypris, 2022

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 : 33

TUCANOCYPRIS Krömmelbein, 1965

Type Species: Tucanocypris camposi Krömmelbein, 1965

Diagnosis: A genus of Cyprididae with a still unknown subfamily assignment. Its species are medium-sized (approximately 0.9mm long). Carapace in lateral outline extended, with broadly rounded end-margins, maximum height at the anterior cardinal angle; in dorsal outline slim to moderately slim, the anterior markedly pointed, posterior rounded. Dorsal margin on both valves with a straight section of about half the valve length slightly inclined towards the posterior. Left valve larger than right valve; the left valve projects beyond the right along all the free margins and overlaps it slightly to very definitely at the middle of the ventral margin; thus the overlapping portion of the margin of the left valve is more or less clearly pressed up against the right valve. Right valve with more distinct cardinal angles, ventral margin indented: very slightly to strongly. Both valves with two round swellings, one in antero-median position, the other in postero-median position, or entirely without coarse sculpture. Carapace surface without fine sculpture. Internal carapace features are still insufficiently known. Inner margin and line of concrescence not coincident. Fused zone narrow at the anterior, and at the posterior very narrow. Calcified inner lamella at the anterior broad with a deep vestibulum; at the posterior narrow with a vestibulum only hinted at. The type and number of the marginal pore canals and the muscle scar pattern not known. Simple groove hinge, not divided into sections, without hinge teeth. Shell fairly thin, only weakly calcified, especially at the edges.