Sensiava secunda, Markhaseva, Elena L., 2014

Markhaseva, Elena L., 2014, New Sensiava species (Copepoda: Calanoida: Diaixidae) from the deep South Atlantic and first description of the female, Zootaxa 3802 (2), pp. 217-239 : 218-223

publication ID	https://doi.org/ 10.11646/zootaxa.3802.2.5
publication LSID	lsid:zoobank.org:pub:EC2A5610-9C2C-4F9A-A998-DFD389542652
DOI	https://doi.org/10.5281/zenodo.6140726
persistent identifier	https://treatment.plazi.org/id/03A88795-476F-FFAA-CA9C-F8C3FE89F949
treatment provided by	Plazi
scientific name	Sensiava secunda
status	sp. nov.

Treatment

Sensiava secunda sp. nov.

( Figs 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 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 View FIGURE 1 A–B). Rostrum as 2 filaments ( Fig. 1 View FIGURE 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 View FIGURE 1 A–B). Urosome of 4 somites ( Fig. 1 View FIGURE 1 D, F). Spermathecae of moderate size, slightly upturned anteriorly ( Fig. 1 View FIGURE 1 E–G). Caudal rami with 1 dorsal seta, 1 ventral seta, and 4 terminal setae.

Antennule ( Fig. 2 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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 View FIGURE 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.