Sensiava secunda Markhaseva, 2014, sp. nov.
Creators: name: Markhaseva, Elena L.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Calanoida
Diaixidae
Sensiava
Sensiava secunda

description: Sensiava secunda sp. nov.
(Figs 1–4)
Holotype. Adult female, dissected, body length 3.30 mm. ZMH Reg. no. K–42161. Collected on 20 March 2005 by the DIVA –II expedition above the sea bed at abyssal depths (5142 m).
Paratype, Body length 3.00 mm. ZMH Reg. no. K–42162, 1 adult female, dissected, the same label data as for the holotype.
Description. Female. Body length 3.30–3.00 mm. Prosome 3.9–3.8 times as long as urosome (Fig. 1 A–B). Rostrum as 2 filaments (Fig. 1 C). Cephalosome and pedigerous somite 1 incompletely separate, and pedigerous somites 4 and 5 completely separate; posterior corners in dorsal view triangular; as short rounded lobes in lateral view (Fig. 1 A–B). Urosome of 4 somites (Fig. 1 D, F). Spermathecae of moderate size, slightly upturned anteriorly (Fig. 1 E–G). Caudal rami with 1 dorsal seta, 1 ventral seta, and 4 terminal setae.
Antennule (Fig. 2 A–B) nearly as long as body, or extending to caudal rami, of 24 articulating segments; armature as follows: I–3 s, II– IV–6 s + 1ae, V–2 s + 1ae, VI–2 s, VII–2 s + 1ae, VIII–2 s, IX–2 s + 1ae, X– XI–4 s + 1ae, XII–1 s, XIII–1? (scar, setal element was broken) XIV–2s + 1ae, XV–1s, XVI–2s + 1ae, XVII–1?, XVIII–1s + 1?, XIX–1s, XX–2s, XXI–1s + 1ae, XXII–1s, XXIII–1s, XXIV–2s, XXV–2s, XXVI–2s, XXVII–XXVIII–5s + 1ae.
Antenna (Fig. 2 C), coxa with 1 seta, basis with 2 setae, one seta very short; exopod of 7 segments with 0, 0-0- 1, 1, 1, 1, 1, 1, and 3 setae; first endopodal segment with 1 seta, second with 8 + 6 setae.
Mandible (Fig. 2 D–E), gnathobase without crest, cutting edge with 4 large and 4 small teeth near dorsal seta; basis with 3 setae; exopod 5-segmented with 1, 1, 1, 1, and 2 setae; endopod segment 1 with 2 setae, segment 2 with 9 setae.
Maxillule (Fig. 3 A–B), praecoxal arthrite with 9 marginal, 4 posterior and 1 anterior setae, distalmost praecoxal arthrite terminal seta curved at apex; coxal endite with 4 setae; coxal epipodite with 7 long and 2 short setae; proximal basal endite with 4 setae, distal basal endite with 4 setae; endopod with 9 (3+6) setae; exopod with 8 setae.
Maxilla (Fig. 3 C–D), praecoxal endite (previously considered as proximal praecoxal endite) with 5 setae; coxal endite (previously considered as distal praecoxal endite) with 3 setae; basal endites (previously considered as coxal endites) with 3 setae each, 1 seta of proximal basal endite sensory, worm-like; enditic-like lobe of proximal endopodal segment (previously considered as proximal basal endite) with 4 setae, 2 sensory, worm-like; setae of the maxilla basal endites and enditic-like lobe of endopod are similar in shape and size, curved and curled distally; endopod with 3 worm-like and 5 brush-like sensory setae and 1 small sclerotized seta.
Maxilliped (Fig. 3 E, 4A), syncoxa with 1 sclerotized seta on proximal praecoxal endite, 2 sclerotized setae on middle praecoxal endite and 3 sclerotized setae, distalmost with poorly developed brush on distal praecoxal endite; coxal lobe with 3 setae. Basis with 3 proximal setae and 2 distal setae. Endopod 5-segmented with 4, 4, 3, 3+1, and 4 setae.
Swimming legs. P1 (Fig. 2 F), coxa with medial spinules; basis with medial spinules and small posterior denticles at base of medial distal seta curved with setules; endopod 1-segmented with lateral lobe, lateral margin without spinules; exopod segments 1 to 3 with 1 lateral spine each, spines of exopod segments 1 and 2 thin distally. P2–P4 (Fig. 4 B–D), coxa with 1 seta; basis without seta, with small denticles distomedially; endopod 2-segmented in P2, with posterior spinules, 3-segmented in P3–P4 with posterior spinules; exopods 3-segmented. Posterior surface of P4 coxo-, basi, and exopod spinulated.
P5 (Fig. 1 H) 3-segmented, composed of coxa, basis and 1-segmented exopod; coxa slightly more elongate than basis; coxa with sparse small spinules distolaterally, basis with distolateral patch of spinules, exopod ornamented with dense surface spinules, 4 distal spines partly or completely separate from segment, medial spine longest.
Type locality. South Atlantic (00º45’S 05º35’W).
Etymology. The species name refers to the chronological sequence in which this species was discovered for the genus.
description: Published as part of Markhaseva, Elena L., 2014, New Sensiava species (Copepoda: Calanoida: Diaixidae) from the deep South Atlantic and first description of the female, pp. 217-239 in Zootaxa 3802 (2) on pages 218-223, DOI: 10.11646/zootaxa.3802.2.5, http://zenodo.org/record/228328