Bradyidius parabyssalis Markhaseva & Renz 2021, sp. nov.

• Main Authors: Markhaseva, Elena L., Renz, Jasmin
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Calanoida; Aetideidae; Bradyidius; Bradyidius parabyssalis; Kamchatka
• Online Access: https://doi.org/10.5281/zenodo.5757664; http://treatment.plazi.org/id/03E73B78FFF8FFD8FF0C60AD7F0AC2FA

Bradyidius parabyssalis sp. nov. (Figs 5–6) Holotype . Adult female, dissected, body length 3.25 mm. SMF 37264/1-3 (slides) and 37265 (vial) (Senckenberg). Collected above the sea bed at Sta. 533, in the Argentine Basin, 36° 00.20’ S 49° 01.96’ W, on 15 July 2009 by the DIVA 3 expedition, Meteor cruise ME 79–1, at a depth of 4602 m. Paratype . One adult female, partly dissected, body length 3.10 mm (poor condition). ZIN, 91150. Collected above the sea bed at Sta. 676, Meteor Seamount 31° 44.58’ N 28° 12.26’ W, on 20 August 2009 by the DIVA 3 expedition, Meteor cruise ME 79–1, at a depth of 2560 m. Additional material . One female (specimen 1), from the Pacific Ocean, body length 3.10 mm, collected above the sea bed in the Kurile-Kamchatka Trench, at Sta. 7–10 on 17 August 2012, 43°01.82’ N 152°58.55’ E, by the KuramBio 1 expedition, Sonne cruise SO 223, at a depth of 5223 m; 2 females (specimens 2 & 3), damaged, not measured, collected above the sea bed in the Kurile-Kamchatka Trench, at Sta. 12–4 on 31 August 2012, 39°42.78’ N 147°09.55’ E, by the KuramBio 1 expedition, Sonne cruise SO 223, at a depth of 5224 m. Description. Female. Body length 3.10–3.25 mm. Prosome 3.7 times as long as urosome. Rostrum (Fig. 5A–D) two-pointed, divergent, excavation between points with two tubercles. General body view including the posterior corners length (Fig. 5E–F) as in B. abyssalis sp. nov. Genital double-somite symmetrical, in its anterior half with lateral swellings in dorsal view and dorsal swelling in lateral view (Fig. 5E–J). Spermathecae visible in holotype only and narrow-elongate and rounded in distal part (Fig. 5E–F). Caudal rami with 1 lateral seta, 1 ventral seta, and 4 terminal setae (Fig. 5E–F). Antennule (Fig. 5K–L) totally retained in holotype only. Ancestral segment I retained in all specimens possesses 3 setae, the distal seta is the longest, proximal are shorter and nearly equal in length. Antennule of holotype reaching pedigerous somite 5, of 24 articulating segments setal numbers at the segments ...