Sensiava longiseta

• Main Authors: Markhaseva, Elena L., Schulz, Knud
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Calanoida; Diaixidae; Sensiava; Sensiava longiseta; Southern Ocean; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.6262010; http://treatment.plazi.org/id/317B87C6FF9AFF80FE92237AFE69270B

Sensiava longiseta gen. et sp. nov. (Figs 1–7) Holotype . Undissected adult male (ZMH Reg. no. K–40772), body length 4.80 mm. Collected Southern Ocean, Weddell Sea (63º44’S 33º48’W), 14–15 March 2002, above the seabed at 4975 m. Paratypes . Dissected male (ZMH Reg. no. K–40773), body length 4.64 mm. Collection data as for holotype. One male (ZMH Reg. no. K–40774) with Mx2 dissected, body length 4.60 mm, collected Southern Ocean, Weddell Sea (64º02’S 39º06’W), 13 March 2002, above the seabed at 4747.5–4742.5 m, Description. Male: total length 4.60–4.80 mm. Prosome 2.5–2.9 times longer than urosome. Rostrum with two long filaments (Fig. 1 B–C). Somites 4–5 of prosome incompletely fused, suture clearly visible laterally; posterior corners as short rounded lobes (Fig. 1 A–B). Caudal rami with 4 terminal setae, 1 ventral seta (Fig. 1 E) and a small dorsal seta (Fig. 1 B, D–E). Antennule exceeding caudal rami by distal segment. Right antennule geniculate (Fig. 2 A–C), 23-segmented, armature as follows: I–1 s + 1ae, II– IV–6 s + 4ae, V–2 s + 2ae, VI–2 s + 1ae, VII–2 s + 2ae, VIII–2 s + 1ae, IX–2 s + 2ae, X– XI–4 s + 3ae, XII–1 ae, XIII–1ae, XIV–1s + 1ae + 1 small sensilla, XV–1s + 1ae, XVI–2s + 1ae, XVII–2s + 1ae, XVIII–2s + 1ae, XIX–1s + 1ae + 1 attenuation, XX–1s + 1ae + 1 spine, XXI–1s + 1ae, XXII–XXIII–1s + 1 hook-like attenuation, XXIV–2s + 1ae, XXV–2s + 1ae, XXVI–2s, XXVII–XXVIII–4s + 1ae. Left antennule (Fig. 3 A–C) 24-segmented, differs in setation from right one in the following way: X– XI-3 s + 3ae + 1?, XII–1 small sensilla + 1ae, XIII–1 small sensilla + 1ae, XVII–1s + 1ae, XIX–1s + 1ae, XX–1s + 1ae, XXII–1s, XXIII–1s, 1 seta on segment 13 (ancestral segment XVI) is strongly curved on both sides (Figs 2 A, 3B). Antenna (Fig. 4 A–B), coxa with 1 seta, basis with 2 setae, exopod 8-segmented with 0, 1, 1, 1, 1, 1, 1 and 3 setae (as 0, 0-0-1,1,1,1,1,1,3; the second proximal segment is a compound segment of 3 fused segments: comma represents an arthrodial membrane, dash represents absence of an arthrodial ...