Leptopsyllus (Leptopsyllus) pundius, Back, Jinwook & Lee, Wonchoel, 2017

Back, Jinwook & Lee, Wonchoel, 2017, Two new species of Leptopsyllus from Korea (Copepoda, Harpacticoida, Paramesochridae), ZooKeys 665, pp. 37-57 : 39-43

Leptopsyllus (Leptopsyllus) pundius sp. n. Figs 1, 2, 3, 4

Type locality.

Republic of Korea, Pung Island (Korean name Pungdo): subtidal zone, 37°5'21.46"N, 126°24'27.10"E (depth: 30 m, sand).

Materials examined.

Holotype 1♀ (MABIK CR00235287) dissected on four slides. Sampled by a grab on a fishing boat on 16 Feb 2008.

Diagnosis.

Description of female. Total body length 390 µm (Fig. 1A); largest width measured at posterior margin of cephalic shield: 67 µm; body cylindrical, slightly depressed dorsoventrally; urosome gradually tapering posteriorly; whole body very hyaline. Rostrum triangular, fused with cephalic shield; with 2 small sensilla. Cephalothorax bell-shaped; pleural areas weakly developed and posterolateral angles rounded; posterior margin smooth, without distinct hyaline frill.

Genital field located mid-ventrally halfway the length of the genital double-somite; copulatory pore located near posterior border of genital field and covered by small process (Fig. 2D); P6 represented by transverse plate with 1 bare seta (Fig. 2D); penultimate somite with well-developed pseudoperculum; anal operculum not developed.

CR (Fig. 1C). Parallel, about 2.7-3.0-times as long as greatest width, conical, distal margin blunt; each ramus armed with 6 setae (seta I not observed and probably vestigial); seta II bare; setae III stout, bearing spinule-like elements; seta IV pinnate; seta V pinnate, longest; seta VI shortest and pinnate; seta VII bi-articulate at base and arising from inner dorsal surface.

A1 (Fig. 2A). 8-segmented, short, robust; seg-1 longest; seg-4 sub-cylindrical process armed with long slender seta fused basally to aesthetasc; seg-6 armed with 1 slender bare seta arising from ventral sub-cylindrical process; armature formula: 1-[1 pinnate], 2-[8 bare + 1 pinnate], 3-[5 bare + 2 pinnate], 4-[2 bare + (1 + ae)], 5-[1 bare], 6-[3 bare], 7-[2 bare], 8-[5 bare + acrothek]; apical acrothek consisting of well-developed aesthetasc fused basally to 2 slender, naked setae.

A2 (Fig. 2B). 4-segmented, comprising coxa, basis, and free 2-segmented enp; coxa small and bare; basis approximately 2.2 times as long as maximum width, without any surface ornamentation; exp 1-segmented, with 2 lateral bare and 2 distal modified setae; proximal endopodal segment with 1 pinnate abexopodal seta; distal endopodal segment armed with 2 bare short spines laterally, 1 naked and 2 spine-like setae in middle of segment, 3 geniculate setae around distal margin, and 1 longest geniculate seta fused at base with 1 bare seta.

Mandible (Fig. 3A). Coxa with well-developed gnathobase bearing 1 pinnate seta at dorsal corner and 6 major spinous overlapping teeth; palp biramous, comprising basis, 1-segmented exp and 2-segmented enp; basis widening distally, with 3 bare setae; exp with 2 distal setae; enp long; enp-1 same as long as exp, with 2 bare setae; enp-2 with 5 basally fused setae at apex.

Maxillule (Fig. 3B). Praecoxal arthrite well-developed, with 6 spines, 2 pinnate setae, and 2 juxtaposed slender setae; coxa with cylindrical endite bearing 3 distal bare setae; basis cylindrical; endites fused, collectively bearing 5 distal bare setae; exp 1-segmented, small, with 2 bare setae; enp 1-segmented, with 4 bare setae distally.

Maxilla (Fig. 3C). Syncoxa with 3 cylindrical endites; praecoxal endite with 2 bare setae; proximal and distal coxal endite with 1 pinnate and 2 bare setae each; allobasis with 2 strong claws and 1 bare seta; enp 1-segmented, with 5 bare setae apically.

Maxilliped (Fig. 3D) comprising syncoxa, basis and 2-segmented enp; syncoxa without element; basis with 1 row of spinules sub-distally; enp-1 with 1 stout seta on distal margin; enp-2 with 1 bare and 2 geniculate setae.

P1 (Fig. 4A). Coxa bare; basis with 1 bare seta on proximal inner margin and 1 small bare outer seta; exp shorter than enp; exp-1 about 1.6 times longer than exp-2, with 1 pinnate seta near outer distal corner; exp-2 with 4 long bare setae distally; enp-1 unornamented, elongate, and approximately 2.3 times as long as enp-2; enp-2 small, with 2 geniculate setae apically.

P2, P3 (Fig. 4B, C). Coxa bare; basis without any surface ornamentation; outer margin with 1 bare seta; exp 3-segmented; exp-1 and -2 with 1 outer pinnate spine; exp-3 with 1 pinnate outer spine and 1 geniculate seta; enp absent.

P4 (Fig. 4D). Coxa bare; basis with 1 bare seta; exp 3-segmented; exp-1 and -2 with 1 outer spine; exp-3 with 1 outer spine and 1 geniculate seta; enp as long as exp-1, with 1 strong spine distally.

Armature formula as follows:

P5 (Fig. 2C) with medially fused baseoendopods and discrete exps; baseoendopod with 1 basal seta; endopodal lobes elongate, closely pressed to each other, with 2 bare apical setae each; exp small, with 3 bare setae, innermost one longest.

Description of male. Unknown.

Etymology.

The specific name refers to the type locality of the new species, Pung Island, Korea.