Calliopius ulleungensis Kim & Kim, 2024, sp. nov.

Calliopius ulleungensis sp. nov. Figs 2, 3, 4, 5, 6 Korean name: Ul-leung- kal-li-o-pe-yeop-sae-u, new Type material. Holotype: • ♂, 13.6 mm, dissected (appendages on one slide), MABIK CR 00257942, South Korea: Ulleungdo Island (site 1), Gyeongsangbuk-do, 37 ° 30 ' 30 " N, 130 ° 58 ' 12 " E, collected from floating algae (Sargassum horneri) K. W. Kim leg., 24 May 2023. Paratypes: • 1 ♀, 11.5 mm, dissected (appendages on one slide), DKUAMP 202408; • 9 ♂♂, 28 ♀♀, DKUAMP 202409, same station data as holotype. Additional material. • 2 ♂♂, 8 ♀♀ Ulleungdo Island (site 2), Gyeongsangbuk-do, 37 ° 32 ' 33 " N, 130 ° 50 ' 28 " E, collected by conical net, K. W. Kim leg., 23 May 2023; • 1 ♂, Taeha-ri, Seo-myeon, Ulleungdo Island, Gyeongsangbuk-do, 37 ° 30 ' 52 " N, 130 ° 47 ' 36 " E, collected by hand net, Y. H. Kim leg., 24 May 2023; • 5 ♂♂, 10 ♀♀ Bongpo-ri, Toseong-myeon, Goseong-gun, Gangwon-do, 38 ° 14 ' 32 " N, 128 ° 34 ' 28 " E, collected from brown algae, Y. H. Kim leg., 20 Jul 2023. Diagnosis. Eyes well developed, subrectangular. Antenna 1 calceolate, peduncular article 3 with distoventral process; flagellum callynophorate, longer than peduncle. Antenna 2 calceolate, densely setose, slightly flattened; gland cone bluntly pointed; flagellum longer than peduncle. Mandibles, incisor with six-seven dentate, lacinia mobilis on both sides, molar triturative. Gnathopods subchelate, moderate, subsimilar; propodus ovoid, palmar margin with numerous setae, six strong robust spines, palmar corner with four medial robust spines; dactylus falcate. Uropod 3 rami foliaceous. Telson linguiform, entire. Description. Holotype, adult male, MABIK CR 00257942. Body (Figs 2 A, 3 A) 13.6 mm long, pleonite 7 – urosomite 2 weekly carinated, laterally compressed; eyes well developed, subrectangular. Epimera (Fig. 3 B), epimeron 1 posteroventral corner minutely pointed, with marginal simple setae, 10 clusters of setae ventrally; epimeron 2 posteroventral corner pointed, with 18 clusters of setae ventrally; epimeron 3 with posteroventral cusp, 12 ventral setae. Antenna 1 (Fig. 3 C) peduncular articles stout, cylindrical, less setose, articles 2–3 calceolate medioventrally, article 3 with obtuse short process distoventrally, length ratio of peduncular articles 1–3 = 1.00: 0.69: 0.35; flagellum longer than peduncle, 28 - articulate, callynophore, two calceoli distomedially on each article from second flagellum; accessory flagellum minute. Antenna 2 (Fig. 3 D) setose; peduncular articles 2–3 short, peduncular articles 3–4 with medial setal rows; peduncular article 4, half of ventrodistal portion with calceoli; peduncular article 5 slender, with two or three rows of calceoli; length ratio of peduncular articles 3–5 = 1.00: 2.11: 2.20; flagellum slightly depressed, 23 - articulate, two calceoli distomedially on each article from second flagellum. Upper lip (Fig. 3 E) semicircular, apically round, pubescent. Lower lip (Fig. 3 F), inner plate indistinct, densely pubescent; outer plate distally expanded, pubescent mediodistally; mandibular process developed. Left mandible (Fig. 3 G), incisor with six blunt teeth, lacinia mobilis with six teeth; accessory setal row with eight setae between lacinia mobilis and molar; molar triturative surface well developed, with pappose seta; palp 3 - articulate; article 1 short, distally setose; article 2 midmedially broadened, with unequal simple setae; article 3 narrowing distally, three apical setae; length ratio of articles 1–3 = 1.00: 3.51: 4.40. Right mandible (Fig. 3 H) similar to left mandible; incisor with seven blunt teeth, lacinia mobilis with five apical teeth; accessory setal row of seven setae between lacinia mobilis and molar. Maxilla 1 (Fig. 3 I), inner plate subrectangular, with four pappose setae apically; outer plate, apical margin with 11 dentate setal teeth; palp biarticulate; article 1 short, unarmed; article 2 elongated ovate, swollen distally, with 11 robust setae. Maxilla 2 (Fig. 3 J), inner plate apex and medial margins setose with a plumose seta on surface; outer plate large, broad, with row of mediodistal setae. Maxilliped (Fig. 3 K), inner plate subrectangular, medial margin with six plumose setae submarginally, apex with four plumose and four stout robust setae; outer plate semicircular, apex slightly beyond end of palp article 2, apex and medial margin straight with marginal blunt robust setae; palp 4 - articulate, article 1 short, articles 2 with distal robust setae, article 3 distal half covered with rows of setae, article 4 falcate. Gnathopod 1 (Fig. 4 A) subchelate, densely setose; coxa with small robust setae posteriorly; basis subrectangular, relatively long, broadened distally, anterior margin with minute setae, posterolateral margins setose, with cluster of pinnate setae posterodistally; ischium short, 0.27 × basis, with distal setae; merus subtriangular, 0.41 × basis; carpus with subtriangular posterior lobe, with apical setae; propodus ovoid, longer than basis; palmar margin with numerous plumose setae, with six strong robust spines, palmar corner with four medial robust spines; dactylus elongated, falcate, 0.55 × propodus. Gnathopod 2 (Fig. 4 B) subsimilar to gnathopod 1 but elongated; basis 1.1 × that of gnathopod 1; propodus slightly longer; palmar corner with five medial robust spines. Pereopod 3 (Fig. 4 C) setose; basis subsimilar to that of gnathopod 1, anterior margin setose, merus with four cluster of robust setae, produced anterodistally with cluster of seta; carpus subrectangular, expanded distally, with postero-marginal cluster of thick setae; propodus rectangular, slightly convex; dactylus falcate, length ratio of basis – dactylus = 1.00: 0.22: 0.75: 0.65: 0.89: 0.37. Pereopod 4 (Fig. 4 D) similar to pereopod 3, slightly shortened. coxa (Fig. 4 E) broad; length ratio of basis – dactylus = 1.00: 0.31: 0.77: 0.74: 0.89: 0.38. Pereopod 5 (Fig. 5 A), coxa bilobate, wider than long; basis subrectangular, expanded posteroventally with 10 minute setae, anterior margin with marginal short robust setae and distal long robust setae; ischium subquadrate; with antero-marginal robust setae; merus with robust setae on both margin, produced posterodistally, with cluster of seta; carpus subrectangular, expanded distally; propodus rectangular, slightly convex; dactylus falcate, length ratio of basis – dactylus = 1.00: 0.24: 0.77: 0.85: 1.06: 0.45. Pereopod 6 (Fig. 5 B) similar to pereopod 5, posterior lobe distally elongated, basis broader than that of pereopod 5, anterolateral margin with row of setae; length ratio of basis – dactylus = 1.00: 0.22: 0.79: 0.85: 1.06: 0.45. Pereopod 7 (Fig. 5 C) similar, but longer than either pereopods 5 or 6; basis broad, twice the area of that of pereopod 5, posterior lobe over end of ischium, anterodistal margin with short robust setae; length ratio of basis – dactylus = 1.00: 0.18: 0.70: 0.79: 1.01: 0.32. Uropod 1 (Fig. 5 D), peduncle subrectangular, each margin with dorsal row of robust setae.; outer ramus × 0.40 peduncle, with 11 robust setae on laterally, four robust setae on medially, two robust setae on apex; inner ramus × 0.5 peduncle, with nine dorsolateral robust setae and seven dorsomedial robust setae, apex on tow robust setae. Uropod 2 (Fig. 5 E), peduncle subrectangular; outer ramus 0.86 × peduncle, with seven dorsolateral robust setae and five dorsomedial robust setae, apex on tow robust setae; inner ramus 1.45 × peduncle, with 14 dorsolateral robust setae and nine dorsomedial robust setae, apex on tow robust setae. Uropod 3 (Fig. 5 F). peduncle short, both rami foliaceous; outer ramus 1.62 × peduncle, with 11 dorsolateral and 14 dorsomedial robust setae; inner ramus subequal to outer ramus, with 21 dorsolateral and 9 dorsomedial robust setae. Telson (Fig. 5 G) linguiform, entire, 1.61 times as long as wide, with 2 setules on each side. Paratype, adult ovigerous female, DKUAMP 202408. Body (Figs 2 A, 6 A) 11.6 mm long, laterally plump, coxae broader than male. Antenna 1 (Fig. 6 B) similar to that of male, peduncular articles shortened; length ratio of peduncular articles 1–3 = 1.00: 0.65: 0.32; flagellum 28 - articulate. Antenna 2 (Fig. 6 C) similar to that of male, peduncular articles shortened; length ratio of peduncular articles 3–5 = 1.00: 1.58: 1.60; flagellum 25 - articulate. Gnathopod 1 (Fig. 6 D) similar to that of male but reduced, more setose; propodus ovoid, longer than basis; palmar margin with numerous plumose setae, six strong robust spines, palmar corner with four medial robust spines. Gnathopod 2 (Fig. 6 E) subsimilar to gnathopod 1 but elongated; coxa expanded, similar in length with basis; basis 1.1 × that of gnathopod 1; propodus slightly longer; palmar margin with numerous plumose setae, seven strong robust spines, palmar corner with four medial robust spines. Remarks. Calliopius ulleungensis sp. nov. resembles several Pacific region species, C. behringi Gurjanova, 1951 from King Island, Bering Sea, C. pacificus Bousfield & Hendrycks, 1997 from Alaska, USA, and C. carinatus Bousfield & Hendrycks, 1997 and C. columbianus Bousfield & Hendrycks, 1997 both from British Columbia, Canada, in having two to numerous rows of calceoli on the peduncular articles on the antennae. Among them, C. behringi and C. carinatus can be easily distinguished by their strong body carination, elongated posterodistal process on antenna 1 peduncular article 3. In general, Calliopius ulleungensis sp. nov. is similar to C. columbianus. However, the new species can be distinguished from C. columbianus by the following characteristics (C. columbianus characters in parentheses): 1) eyes subrectangular (vs ovate); 2) antenna 1, posterodistal process of peduncular article 3 reaching half of flagellar article 1 (vs reaching the end of flagellar article 1); 3) antennae flagellum with fewer than 30 articles (vs with more than 30 articles, up to 40); and 4) maxilla 1, inner plate with 4 apical pappose setae (vs with 5 apical pappose setae). Calli

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