Lichomolgella nudicoxa, Lee & Kim, 2025

Lee, Jimin & Kim, Il-Hoi, 2025, Three new species of Lichomolgella Sars G. O., 1918 (Copepoda, Cyclopoida, Sabelliphilidae) associated with Bryozoa in Korea, ZooKeys 1244, pp. 195-211 : 195-211

publication ID	https://doi.org/10.3897/zookeys.1244.155561
publication LSID	lsid:zoobank.org:pub:8A6E974D-C606-4BA3-975D-F7AF60964756
DOI	https://doi.org/10.5281/zenodo.15856259
persistent identifier	https://treatment.plazi.org/id/88FE4E15-F963-55A1-A2FE-D9122C322DD2
treatment provided by	ZooKeys by Pensoft
scientific name	Lichomolgella nudicoxa
status	sp. nov.

Treatment

Lichomolgella nudicoxa sp. nov.

Figs 6 View Figure 6 , 7 View Figure 7

Type locality.

Munseom islet off Seogwipo in Jeju Island (33°13'35.5"N, 126°33'45.3"E), Korea GoogleMaps .

Type material.

• Holotype (♀, HNIBRIV 2392 ), paratypes (intact 2 ♀♀, HNIBRIV 2393 ), and 2 dissected paratypes (2 ♀♀) from washings of a coral-like bryozoan colony, 20 July 2022, collected by Drs. Taewon Cheong, Hyun-Kyeong Kim and Jong-Guk Kim GoogleMaps . Holotype and intact paratypes have been deposited in the Honam National Institute of Biological Resources ( HNIBR), Mokpo, Korea. Dissected paratypes are kept in the collection of I. - H. Kim.

Etymology.

The specific name nudicoxa is a noun derived from Latin nud (naked) and coxa (the hip), referring to the absence of the inner coxal coxa on legs 1–4.

Description.

Female. Body (Fig. 6 A, B View Figure 6 ) small, cyclopiform. Body length of described specimen 447 μm. Prosome rhomboidal, 314 × 220 μm. Cephalothorax 220 μm long, as long as wide, lacking dorsal suture line defining cephalosome and first pedigerous somite. Lateral corners of all prosomal somites rounded or blunt. Urosome (Fig. 6 C View Figure 6 ) 5 - segmented. Fifth pedigerous somite 38 μm wide. Genital double-somite 1.24 times longer than wide (52 × 41 μm), consisting of broader anterior 4 / 5 and narrower posterior 1 / 5, with partial articulation dorsally between these two parts; genital apertures positioned ventrally (Fig. 6 D View Figure 6 ), represented by large digitiform process tipped with large seta (59 μm long, extending beyond distal margin of caudal rami). Three abdominal somites 15 × 33, 9 × 32, and 12 × 33 μm, respectively. Anal somite with smooth posteroventral margin (Fig. 6 D View Figure 6 ). Caudal ramus 1.07 times longer than wide (16 × 15 μm), with 6 setae, unornamented; setae IV and V broadened, tape-like; setae IV – VI weakly pinnate, other setae naked.

Rostrum (Fig. 6 E View Figure 6 ) strongly tapering, with pointed distal apex. Antennule (Fig. 6 F View Figure 6 ) stout, 103 μm long, 7 - segmented; armature formula 3, 11, 5, 3, 4 + aesthetasc, 2 + aesthetasc, and 7 + aesthetasc; all setae naked. Antenna (Fig. 6 G View Figure 6 ) 4 - segmented; armature formula 1, 1, 3 + claw, and 3 + 4 claws; second segment (first endopodal segment) 1.50 times longer than wide (36 × 24 μm), with acutely pointed outer distal corner; third segment very short; fourth segment 1.31 times longer than wide (21 × 16 μm).

Labrum (Fig. 6 H View Figure 6 ) with elongate posterior lobes and deep median incision; each lobe much longer than wide, with broad membranous fringe on distal margin. Mandible (Fig. 6 I View Figure 6 ) lacking inner notch; gnathobase short, bluntly tipped, with 1 large claw-like scale at outer proximal corner followed by denticulate outer margin, 1 row of denticles on anterior surface. Maxillule (Fig. 6 J View Figure 6 ) lobate, with 4 naked setae. Maxilla (Fig. 6 K View Figure 6 ) 2 - segmented; proximal segment (syncoxa) unarmed; distal segment (basis) with 2 setae (setae I and II), 6 or 7 teeth on distal margin and setule-like distal lash; inner seta (seta I) large, pinnate, extending beyond distal lash; anterior seta (seta II) slender, unornamented; seta III absent. Maxilliped (Fig. 7 A View Figure 7 ) 3 - segmented; first segment unarmed; second segment armed with 2 unilaterally spinulose setae, 14 (proximal one) and 9 μm (distal one), respectively; third segment terminated in elongated, spiniform process, proximally with 2 unequal setae and 1 small spiniform process.

Legs 1–3 (Fig. 7 B – D View Figure 7 ) with 3 - segmented exopod and 2 - segmented endopod. Leg 4 (Fig. 7 E View Figure 7 ) with 3 - segmented exopod and 1 - segmented endopod. Coxa of legs 1–4 lacking inner seta. Third exopodal segment of legs 3 and 4 armed with 3 spines and 5 setae (formula II, I, 5). Endopodal segment of leg 4 twice as long as wide; distally armed with 2 spines of equal length (25 μm). Armature formulae for legs 1–4 as follows:

Leg 5 (Fig. 6 C View Figure 6 ) consisting of 1 small dorsolateral seta on fifth pedigerous somite and exopod; exopodal segment (Fig. 7 F View Figure 7 ) 2.0 times longer than wide (14 × 7 μm), distally armed with 1 spine (11 μm long) and 1 long seta (62 μm long). Leg 6 (Fig. 6 D View Figure 6 ) probably represented by large digitiform process bearing 1 small lateral and 1 large distal seta on genital operculum.

Male. Unknown.

Remarks.

Lichomolgella nudicoxa sp. nov. has two-segmented endopods of legs 1–3, a segmentation pattern shared only with L. exigua sp. nov. However, L. nudicoxa sp. nov. is clearly distinguished from the latter species, as it has no inner coxal setae in legs 1–3 (Table 1 View Table 1 ). The presence of a large distal seta on the female genital operculum, which extends beyond the distal margin of the caudal rami, appears to be an outstanding feature of L. nudicoxa sp. nov. A similar distal seta on the female genital operculum is observed in L. pusilla and L. exigua sp. nov., but it is distinctly smaller in these two species, extending beyond the posterior margin of the first free abdominal somite in L. pusilla as illustrated by Sars (1918) or reaching the posterior margin of the anal somite in L. exigua sp. nov. as shown in Fig. 1 B View Figure 1 . The presence of six or seven teeth on the distal margin of the basis of the maxilla is another characteristic feature of L. nudicoxa sp. nov. In contrast, the number of the teeth on the same margin is three in L. pusilla , as illustrated by Sars (1921), and four in both L. exigua sp. nov. and L. collata sp. nov.