Caudacalanus mirus Markhaseva & Schulz, 2008, sp. nov.

• Main Authors: Markhaseva, Elena L., Schulz, Knud
• Format: Other/Unknown Material
• Language: unknown
• Published: 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Calanoida; Arctokonstantinidae; Caudacalanus; Caudacalanus mirus; Southern Ocean; Seta
• Online Access: https://zenodo.org/record/6227774; https://doi.org/10.5281/zenodo.6227774

Caudacalanus mirus sp. nov. (Figs 1–3) Holotype. Dissected adult female (ZMH Reg. no. K– 41255), body length 2.70 mm. Collected Southern Ocean, 60 º 38 ’S 53 º 57 ’W, RV Polarstern (ANDEEP I), 30 January 2002, above the seabed at 2893 – 2889 m. Paratype. Dissected adult female (ZMH Reg. no. K– 41256), body length 2.80 mm. Collected Southern Ocean, 65 º 19 ’S 51 º 31 ’W, RV Polarstern (ANDEEP II), 0 5 March 2002, above the seabed at 3050 m. The holotype and paratype are deposited at the Zoological Museum Hamburg, University of Hamburg (ZMH). Description. Female: total length 2.70–2.80 mm (n= 2). Prosome 1.3–1.5 times as long as urosome. Rostrum as an elongated cone (Fig. 1 C–D). Posterior corners of prosome as short rounded lobes (Fig. 1 A–B, I). Genital double somite symmetrical (Fig. 1 H–I, K). Caudal rami asymmetrical; right ramus nearly twice as long and wide as left; both rami with 4 terminal setae; right ramus with a small mediodorsal seta, ventral seta lacking; left ramus with a small medioventral seta, dorsal seta lacking (Fig. 1 B, F–G). Antennule extending to posterior border of prosome somite 3 (Fig. 3 A–D), 25 ­segmented, segments 24– 25 incompletely separate, armature as follows: I– 1 s, II– IV– 6 s + 1 ae, V– 2 s, VI– 2 s, VII– 2 s + 1 ae, VIII– 2 s, IX– 2 s, X– XI– 4 s + 1 ae, XII– 1 s, XIII– 2 s, XIV– 2 s, XV– 1 s, XVI– 2 s, XVII– 1 s, XVIII– 1 s, XIX– 1 s, XX– 1 s, XXI– 2 s, XXII– 1 s, XXIII– 1 s, XXIV– 2 s, XXV– 2 s, XXVI– 2 s, XXVII– 2 s, XXVIII– 3 s+ 1 ae. Antenna (Fig. 2 A), coxa with 1 seta; basis with 2 setae; first endopodal segment with 1 seta (2 in paratype), second with 7 (8 in paratype) and 6 setae (13­14 setae in total), endopod about 1.8 times as long as exopod; exopod 8 ­segmented with 0, 1, 1, 1, 1, 1, 1 and 3 setae, second segment complex of 3 ancestral segments with 0– 0–1 setae. Mandible (Fig. 2 B–C), gnathobase with 4 large teeth and seta; basis with 2 setae; endopod segment 1 without setae, segment 2 with 8 setae; exopod 5 ­segmented with 1, 1, 1, 1 and 2 setae. Maxillule ...