Chavturia abyssopelagica Angel, 2013, new species

• Main Author: Angel, Martin V.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Ostracoda; Halocyprida; Halocyprididae; Chavturia; Chavturia abyssopelagica; North East Atlantic
• Online Access: https://zenodo.org/record/5614901; https://doi.org/10.5281/zenodo.5614901

Chavturia abyssopelagica, new species (Figs 1–6) Etymology. The specific name refers to the bathymetric distribution of the species. Type material. Holotype: 1 male, dissected on slide, NHM registration number 2012.1123 Paratypes: 53 specimens, NHM registration numbers 2012.1124–2012.1173 (details see appendix). Type locality. North-east Atlantic off the North-west African coast at Discovery station 9131 # 19: 20 ° 14.24 ’N; 21 ° 47.06 ’W; depth 3760 – 3510 m; 21 November 1976. Male. Carapace (Fig. 1 A, B). Length (CL) ranges 3.16–3.48 mm (mean 3.30 ± 0.104 mm; n = 19) and the height and breadth are 57.5 % and 40.2 % CL respectively (hereafter all percentages of the carapace length are abbreviated to % CL) for the type specimen. The dorsal margin is almost straight. The ventral margin curves smoothly into the posterior margin. The maximum height is at two-thirds the length and there is a marked anterior taper. The rostra are slightly humped dorsally and are quite short; the distance from the anterior end of the hinge between the two carapace valves to the tip of the rostrum is ~ 10 % CL. The flanks of the carapace are finely spinose in the anterior ventral region below the incisure. The asymmetrical carapace glands are located in the typical positions for the subfamily. On the right carapace valve the gland opens close to the posterior ventral corner (at ~ 90 % the maximum carapace height below the hinge-line), and directly below the posterior end of the hinge between the two carapace valves. The gland on the left valve opens close to the posterior dorsal corner just anterior (~ 0.6 % CL) to the posterior end of the hinge between the two carapace valves. In lateral aspect, the incisure is distinct, but quite shallow (7.5 % CL) and is less than the rostral length. In ventral view (Fig. 1 B) the flanks of the carapace curve smoothly from front to back, and the tips of the rostra are just visible projecting beyond the ventral anterior margin. The live coloration is a uniform red-brown in both sexes and the whole ...