Haplostoma vanuatuense Kim &amp; Boxshall 2021, sp. nov.
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Cyclopoida
Ascidicolidae
Haplostoma
Haplostoma vanuatuense

description: <i>Haplostoma vanuatuense</i> sp. nov. (Fig. 96) <b>Type material.</b> Holotype ♀ (MNHN-IU-2018-1996, dissected and mounted on a slide) from <i>ohçpalaea desme</i> Monniot F., 2003 (Type MNHN-IT-2008-7888 = MNHN P1 / RHO.A/32); S. Anatom Is., Vanuatu, MUSORSTOM 8 cruise, RV "Alis", Stn CP 961 (20°18´S, 169°50´E), depth 100-110 m, Bouchet &amp; Richer de Forges-IRD coll., 21 September 1994. <b>Etymology.</b> The type locality, Vanuatu, provides the name of the new species. <b>Description of female.</b> Body (Fig. 96A, B) eruciform, narrow, slightly curved dorsally: body length 2.43 mm, maximum width 540 μm and maximum dorsoventral depth of 570 μm both at level of second pedigerous somite. Cephalosome and 4 metasomites defined by lateral constrictions; fourth metasomite compound, consisting of fused fourth and fifth pedigerous somites. Genitoabdomen slightly longer than wide (277×270 μm), distinctly 3-segment- ed, consisting of genital somite and 2-segmented abdomen. Genital somite comprising broad anterior and narrower posterior parts; genital apertures positioned dorsally. Caudal ramus (Fig. 96C) tapering, slightly wider than long (38×40 μm); armed with 1 claw-like distal spine, 1 subdistal seta, and 1 outer seta. Egg sac longer than body, coiled, containing about 5 rows of eggs; each egg about 200 μm in diameter. Rostrum absent, but rostral area sclerotized (Fig. 96D). Antennule (Fig. 96E) incompletely 2-segmented, armed with 1 seta on proximal segment and 18 setae on distal segment; all setae short and bluntly tipped, except 5 longer, attenuated setae in distal region. Antenna (Fig. 96F) 2-segmented; proximal segment unarmed; distal segment narrower and shorter than proximal segment, 2.6 times longer than wide; armed with 4 simple spines, all articulated at base. Labrum (Fig. 96D) well-developed, with 6 equal lobes along posterior margin, all of these lobes longer than wide and each with rounded apex. Mandible (Fig. 96D) twice as long as wide (33×16 μm), tapering, with 2 equal setae on apex. Maxillule and maxilla absent. Maxilliped (Fig. 96G) robust, 4-segmented; broad first segment unarmed; second segment bearing broad, short setae; small third and fourth segments unarmed; terminal claw small, bifurcate. Leg 1 (Fig. 96H) consisting of protopod, exopod and endopod; protopod bearing 1 seta on outer margin; exopod incompletely defined from protopod, armed with 1 seta and 4 simple spines; endopod triangular, not articulated from protopod, shorter than exopod. Leg 2 (Fig. 96I) with 1 seta and 3 spines on exopod; endopod much larger than that of leg 1, as long as exopod, with small nipple-shaped tubercle on apex. Legs 3 and 4 similar to leg 2 in armature and shape, but lacking distal tubercle on endopod. Leg 5 (Fig. 96J) small but distinct, digitiform, longer than wide (110×67 μm), not articulated at base; rounded distal margin armed with 4 thin setae (1 dorsal and 3 distal). Leg 6 (Fig. 96K) represented by 2 small spines, 1 larger spiniform process, and 7 denticles on genital operculum; 6 other internal denticles visible near leg 6. <b>Male.</b> Unknown. <b>Remarks.</b> <i>eaplçstçma vanuatuense</i> <b>sp. nov.</b> possesses 6 distinct, equal lobes on the posterior margin of the labrum and has a combination of 5, 4, 4, and 4 armature elements on the exopods of legs 1-4. Among previously known species only <i>e</i>. <i>kẚmẚ</i> Seo &amp; Lee, 2001 recorded from the Sea of Japan (Seo &amp; Lee, 2001) shares both of these features. <i>eaplçstçma kẚmẚ</i> is distinguishable from <i>e</i>. <i>vanuatuense</i> <b>sp. nov.</b> by three main features: (1) the genitoabdomen is not segmented (cf. 3-segmented in <i>e</i>. <i>vanuatuense</i> <b>sp. nov.</b>); (2) the outer margins of legs 3 and 4 each bear a large protrusion near the base of the proximal seta (cf. such a protrusion is absent in <i>e</i>. <i>vanuatuense</i> <b>sp. nov.</b>); and (3) leg 5 is strongly tapering, with 1 proximal and 2 distal setae (cf. digitiform, with 1 proximal and 3 distal setae in <i>e</i>. <i>vanuatuense</i> <b>sp. nov.</b>). These differences are sufficient to justify the establishment of the new species.
description: Published as part of <i>Kim, Il-Hoi &amp; Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, pp. 1-286 in Zootaxa 1</i> on page 149, DOI: 10.11646/zootaxa.4978.1.1, http://zenodo.org/record/4820443
description: {"references": ["Seo, I. S. &amp; Lee, K. S. (2001) eaplcstcma k \u1e9am\u1e9a, a new species and a redescription of eaplcstcmella halccynth \u1e9aae (Fukui) from Korea (Copepoda: Cyclopoida: Ascidicolidae). mrcceed \u1e9angs cf the B \u1e9aclcg\u1e9acal Scc \u1e9aety cf tash \u1e9angtcn, 114 (1), 229 - 236."]}