Paracypris ovidi Forel sp. nov.

urn:lsid:zoobank.org:act: 7DB2FA3F-A4F7-451A-ACC2-5D3D6199CADD

Fig. 10 H–N

Diagnosis

A small ear-shaped species with conspicuous dorsal angulations and anterior maximum of curvature slightly below mid-height.

Etymology

In reference to the Latin poet Ovid (Publius Ovidius Naso) who died in exile on the Black Sea shore in Tomis, present-day Constanţa (Romania).

Material examined

Holotype

ROMANIA • 1 complete carapace; Black Sea, Romanian Continental Shelf, borehole 817LV, sample CM31B; Rhaetian, Upper Triassic; MNHN.F. F63268.

Paratypes

ROMANIA • 1 complete carapace; same collection data as for holotype; Rhaetian, Upper Triassic; MNHN.F. F63271 • 1 complete carapace; same collection data as for holotype; Rhaetian, Upper Triassic; MNHN.F. F63269 .

Other material

ROMANIA • 1 complete carapace; same collection data as for holotype; Rhaetian, Upper Triassic; MNHN.F. F63270 • 1 complete carapace; same collection data as for holotype; Rhaetian, Upper Triassic; MNHN.F. F63364 • 1 complete carapace; same locality as for preceding but sample CM31C; Rhaetian, Upper Triassic; MNHN.F. F63272 • 1 complete carapace; same locality as for preceding but sample CM31A; Rhaetian, Upper Triassic; MNHN.F. F63273 • 11 complete carapaces, 2 broken carapaces; same locality as for preceding but samples CM31A, CM31B and CM31C; Rhaetian, Upper Triassic; MNHN.F. F63358 .

Dimensions

See Fig. 3H.

Description

Carapace small, ear-shaped, tapered posteriorly in lateral view, with H max at antero-dorsal angulation, L max slightly below mid-H and W max at mid-L; LV overlaps RV very thinly along DB, PDB and VB; dorsal margin distinctly tripartite with conspicuous angulations, more uniformly arched in small specimens; ADB, DB and PDB straight, PDB sometimes slightly convex; ADB and DB of similar length (±80% of L max), respectively gently sloping to AB and antero-dorsal angulation; PB short (± 20% of L max), inclined posteriorly with an angle of 45–55°; AB relatively large, with largely rounded AVB and maximum of convexity located slightly below mid-H; PB narrowly rounded, with maximum of curvature slightly above ventral margin; surface smooth; inner structures not visible.

Occurrence

Romanian Continental Shelf, Black Sea, Rhaetian, Upper Triassic (this paper).

Remarks

Paracypris ovidi sp. nov. is closely related to Pseudomacrocypris ? kerabani sp. nov. described below, from which it differs by having dorsal angulations more acute and AB angulation located slightly higher. Paracypris ovidi sp. nov. also displays a normal overlap of LV around RV, which excludes it from Pseudomacrocypris and relates it to Paracypris . Paracypris ovidi sp. nov. also differs from the widespread Jurassic P. redcarensis (Blake, 1876) (e.g., Harloff & Jäger 1994; Boomer et al. 1998; Ainsworth & Boomer 2001; Honigstein et al. 2014) in being less tapered posteriorly, with a less rounded anterior margin and a less pronounced overlap.

The H/L diagram shown in Fig. 3H documents the occurrence of several ontogenetic stages, the delimitation of which is complicated. The holotype (Fig. 10H) and one of the paratypes (Fig. 10I) are among the largest specimens recorded. The ontogenetic development of Paracypris ovidi sp. nov. mainly consists in size increase and accentuation of dorsal angulations.