Kyphocalanus atlanticus Markhaseva & Schulz, 2009, sp. nov.
Creators: name: Markhaseva, Elena L.
name: Schulz, Knud
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Calanoida
Kyphocalanidae
Kyphocalanus
Kyphocalanus atlanticus

description: Kyphocalanus atlanticus sp. nov.
(Figs 1–5)
Holotype. Dissected adult female, body length 2.24 mm. ZMH Reg. no. K–41633. Collected on 28 July 2000, above the sea bed at abyssal depths (5390m).
The holotype is deposited at the Zoological Museum Hamburg (ZMH), University of Hamburg.
Type locality. South Atlantic (16º18’S 05º27’E).
Description. Female. Prosome 5.2 times as long as urosome.
Rostrum with two strong prong-like rami (Fig. 1 C–D). Cephalosome and somite 1 and somites 4 and 5 of prosome separate; posterior corners prolonged as triangular lobes (Fig. 1 A–B, E–F). Urosome of 4 somites. Caudal rami with 4 terminal setae, 1 ventral and a dorsal seta (Fig.1 E-F).
Antennule (Fig. 2 A-B) extending to distal margin of pediger 4, of 24 free segments; armature as follows: I–2 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–1s, XIV–2s + 1ae, XV–1s, XVI–2s + 1ae, XVII–1s, XVIII–1s, 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 without seta; exopod of 8 free segments with 0, 1, 1, 1, 1, 1, 1, and 3 setae, about 1.8 times as long as endopod; first endopodal segment without seta, second with 4 + 6 setae. Mandible (Fig. 2 D), gnathobase long and slender, cutting edge narrow, with 4 acute and 4 or 3 small teeth plus dorsal seta; basis with 2 setae, proximal with basal part haft-like; exopod 5-segmented with 1, 1, 1, 1, and 1 setae; endopod segment 1 without setae, segment 2 with 9 setae.
Maxillule (Fig. 3 A), praecoxal endite with 3 terminal setae; coxal endite with 2 setae; proximal basal endite without seta, distal basal endite with 1 seta; endopod with 5 setae; exopod with 7 setae; coxal epipodite with 9 setae.
Maxilla (Fig. 4), proximal praecoxal endite with 2 setae; distal praecoxal endite with 2 setae; proximal coxal endite with 2 setae; distal coxal endite with 2 setae; proximal basal endite with 1 spine; distal basal endite plus endopod with 8 long and thick worm-like sensory setae.
Maxilliped (Fig. 3 B), syncoxa with 1 worm-like, comparably thin and short sensory seta on proximal praecoxal lobe, 2 long and thick worm-like setae on middle lobe extending to distal part of endopod; distal praecoxal lobe without setae; coxal lobe with 1 seta. Basis with 3 setae. Endopod 6-segmented with 2, 4, 2, 2, 2+1, and 4 setae.
Swimming legs. P1 (Fig. 5 A–B), basis with medial distal seta nearly straight, or slightly curved with setules; endopod 1-segmented without lateral lobe, outer margin with slight undulation in a proximal half of segment; exopod segments 1 to 3 with 1 lateral spine each, spine of segment 1 the shortest exceeding base of following spine; spine of exopod segment 2 not reaching base of distalmost spine. P2–P4 (Fig. 5 C), coxa with 1 seta; basis without seta; endopod 2-segmented in P2, 3-segmented in P3–P4; exopods 3-segmented (exopodal segments 2 and 3 of P4 broken); lateral spines of P2–P3 compact, that of exopod segment 1 the shortest. Posterior surface of P4 spinulate.
P5 (Fig. 3 C) 3-segmented, coxa and basis of equal length; coxa with distolateral row of 6 spinules, basis with patch of spinules distolaterally, exopod ornamented with rare surface spinules and 2 distal spines, terminal spine about 0.6 times length of subterminal inner spine.
Etymology. The species name “ atlanticus ” refers to the type locality of the species in the Atlantic Ocean. The name is an adjective agreeing in gender with the (masculine) generic name.
description: Published as part of Markhaseva, Elena L. & Schulz, Knud, 2009, A new family and genus of calanoid copepods (Crustacea) from the abyss of the Atlantic Ocean, pp. 21-40 in Zootaxa 2304 on pages 24-30, DOI: 10.5281/zenodo.275327