Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata) Author Kim, Il-Hoi 0000-0002-7332-0043 Korea Institute of Coastal Ecology, Inc., 802 - ho, 302 - dong, 397 Seokcheon-ro, Ojeong-gu, Bucheon, Gyeonggi-do 14449, Republic of Korea ® ihkim @ gwnu. ac. kr; https: // orcid. org / 0000 - 0002 - 7332 - 0043 ihkim@gwnu.ac.kr Author Boxshall, Geoff A. 0000-0002-7332-0043 Korea Institute of Coastal Ecology, Inc., 802 - ho, 302 - dong, 397 Seokcheon-ro, Ojeong-gu, Bucheon, Gyeonggi-do 14449, Republic of Korea ® ihkim @ gwnu. ac. kr; https: // orcid. org / 0000 - 0002 - 7332 - 0043 ihkim@gwnu.ac.kr text Megataxa 2020 2020-12-24 4 1 1 6 http://zoobank.org/3fdd970e-62f1-4f67-8cce-10870bdb3c01 journal article 54097 10.11646/megataxa.4.1.1 7c9bc39d-9910-46f1-9558-c0647b9cbbdb 2703-3090 4591138 Unimeria longipedata gen. et sp. nov. ( Fig. 382 ) Type material . Holotype ♀ (dissected and mounted on a slide, MNHN-IU-2014-21418 ) from the colonial ascidian Leptoclinidesapertus Monniot F., 1989 (MNHN-IT-2008- 4767 = MNHNA2/LEP/20), Rocher à la Voile , Noumea , NC45, New Caledonia , depth 9-10 m , Monniot coll., 19 March 1987 . Etymology . The specific name refers to the long, digitiform rami of legs 1–4. Description of female . Body ( Fig. 382A ) unsegmented; bodylength (prosome length) 2.43 mm. Prosome undivided, elongate, gradually broadening posteriorly, with rounded posterior margin; dorsoventral depth of posterior part 936 μm. Cephalosome obscurely defined by slight lateral constriction. Free urosome ( Fig. 382B ) short, unsegmented, widerthan long, directed perpendicular to prosome, not articulated from prosome, inserted into posteroventral surface of brood pouch. Caudal ramus ( Fig. 382C ) not articulated from urosome, strongly tapering, slightly longer than wide (63×52 μm); armedwith 6 naked setae. Rostrum( Fig.382D )weak,flexible,broadproximally, narrow and tapering distally; denselycovered with setules. Antennule ( Fig. 382E ) also densely ornamented with setules, incompletely 2-segmented; broader first segment armedwith 17 small setae, narrower, tapering second segment with 8 setae. Antenna ( Fig. 382F ) 3-segmented; coxa and basis unarmed; unsegmented endopod narrow, 3.6 timeslongerthan wide (160×44 μm) and longerthan basis; armed with 6 small setae (2 at proximal 40% on inner margin, 2 subdistal, and 2 distal) plus very small terminal claw, 0.25 times as long as endopodal segment. Labrum ( Fig. 382G ) broad, unornamented, with convex posterior margin. Mandible ( Fig. 382H ) with coxalgnathobase slightly narrowing medially; medial margin nearly straight, pectinate, with 1 minute tooth distally: palp consistingof basis (basis+first endopodal segment) armed with 2 setae; exopod and endopod each with 4 setae. Maxillule ( Fig. 382I ) as single lobe bearing 10 densely plumose setae (medial 3 shorter than others). Maxilla ( Fig. 382J ) strongly curved, incompletely 3- segmented; armed with 4, 1, and 2 setae on first to third segments, respectively. Maxilliped absent. FIGURE 382. Unimeria longipedata gen. et sp. nov . , female. A, habitus, right; B, urosome, dorsal; C, caudal ramus, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, leg 1; L, leg 2; M, leg 3; N, leg 4. Scale bars: A, 0.5 mm; B, 0.1 mm; C, H–J, 0.02 mm; D–G, K–N, 0.05 mm. Legs 1–4 ( Fig. 382 K-N) biramous, unsegmented with elongate digitiform rami covered with setules; rami lacking any trace of articulation; endopods shorter than exopods. Exopods of legs 1–4 armed with 9, 13, 8, and 8 setae, respectively, 1 seta (originally outer seta of basis) positioned on proximal outer margin. Endopods of legs 1–4 armed with 7, 8, 8, and 6 setae, respectively. All setae small and naked, except original inner distal seta on basis on proximal inner margin of leg 1 endopod broadened. Leg 4 smaller than anterior legs. Leg 5 absent. Male . Unknown. Remarks . The new species shares the same species of host with Adrodelphys tectifera gen. et sp. nov. (described below) from the same locality.