Lobatoradarea kagoshimensis Ariyama & Kohtsuka & Hoshino & Kodama & Moritaki & Chen 2025, sp. nov.

Lobatoradarea kagoshimensis Ariyama & Kodama, sp. nov. [New Japanese name: Kagoshima-udenaga-yokoebi] (Figs 17–21) Type material. Holotype: ovigerous female, 5.1 mm (OMNH-Ar-13222), Kagoshima Bay, off Yojirō, Kagoshima City, Kagoshima Prefecture, 31°33'27"N, 130°33'49"E (Fig. 1I), 21–23 m depth, fish reef on sandy-mud bottom, using bait trap, 6 August 2021, coll. Midori Matsuoka. Paratypes: ovigerous female, 5.1 mm (OMNH-Ar-13223, not dissected), ovigerous female, 4.2 mm (OMNH-Ar-13224), 2 females, 4.3, 3.6 mm (OMNH-Ar-13225, 13226), 3 males, 4.0, 3.9, 3.7 mm (OMNH-Ar-13227–13229), same data as holotype. Type locality. Off Yojirō, Kagoshima City in Kagoshima Prefecture, Japan. Etymology. Referring to the type locality. Description of female. Based on holotype, ovigerous female, 5.1 mm (OMNH-Ar-13222), and paratype, ovigerous female, 4.2 mm (OMNH-Ar-13224) for antenna 2. Head (Figs 17, 18). Rostrum strongly developed, lateral cephalic lobe roundish-angular, anteroventral corner moderately projected. Eyes large (diameter: 47% of head height). Antenna 1, peduncular articles 1–3 with length ratio of 1.0: 0.8: 0.2; accessory flagellum very short, cone-shaped, with 5 setae; primary flagellum with 27+ articles, tip lost, article 1 long, 8 articles with aesthetasc. Antenna 2, peduncular articles 3–5 with length ratio of 1.0: 2.4: 3.1, each article bearing several robust setae; flagellum, most part lost, article 1 long. Upper lip relatively long, produced ventrally, anterior surface and ventral margin with many minute setae. Mandibles, both incisors with 7 cusps, laciniae mobilis 8- and 3-toothed in left and right, respectively, both accessory setal rows with 4 thick setae; palp stout, article length ratio 1.0: 3.5: 2.1 in left, article 1 short, bare, article 2 long, with 3–4 setae subdistally, article 3 bearing 1 proximal, 8 ventral and 2 thick and 2 slender distal setae, lateral surface covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with relatively long mandibular lobes, setose mediodistally, ventrodistal surfaces and lateral margins with sparse fine setae. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae, tip with a long thick seta; outer plate distally with 11 denticulate robust setae and 7 thick setae; palp article 1 bare, article 2 apically with 6 triangular and 1 long robust setae and 4 slender setae in left and 7 narrow robust setae and 4 slender setae in right. Maxilla 2, inner plate ca. 1.5 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 5 long and 12 short robust setae mediodistally; palp article 3 dorsal surface with 4 thick setae and many fine setae. Pereon (Figs 17, 19). Pereonite 7 not projected posterodorsally. Gnathopod 1 small; coxa subrectangular, with 2 small notches each on anteroventral and posteroventral margins, medial surface bearing several setae; basis slender, straight, anterior margin lined with short setae, posteroproximal margin bearing 4 long setae, lateral and medial surfaces setose; merus acutely projected distally, with several thick setae on posterodistal margin; carpus relatively long, posterior margin bearing many thick setae; propodus slightly shorter than carpus (ca. 0.9 times), posterior margin with several thick setae, palm weakly oblique, defined by 3 (1 lateral and 2 medial) short robust setae; dactylus short. Gnathopod 2 much longer than gnathopod 1; coxa roundish rectangular, with 1 and 2 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing 5 setae; basis slender, straight, anterior margin with a few short setae, posterior margin bearing 1 long and 2 short setae; merus acutely projected distally, posterior margin with a few setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus longer than carpus (ca. 1.2 times), narrow, anterior margin lined with short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 4 (2 lateral and 2 medial) short robust setae; dactylus short. Pereopod 3 shorter than gnathopod 2; coxa roundish rectangular, with 3 and 1 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing many setae; basis slightly curved anteriorly, anterior margin with 3 robust setae, posteroproximal margin with 4 slender setae; merus anterodistal corner with a long robust seta; carpus posterior margin with 5 robust setae; propodus longer than carpus, posterior margin with 5 robust setae; dactylus with a minute projection on inner margin. Pereopod 4 almost same length as pereopod 3; coxa ventral margin rounded, with 5 and 3 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing many setae; basis slightly curved anteriorly, anterior margin with 2 robust setae, posteroproximal margin with 4 slender setae; ischium–dactylus similar to those of pereopod 3. Pereopod 5, coxa anteroventral and posterior margins with 3 and 5 small notches, respectively; basis longish ovoid, anterolateral ridge indistinct, anterior margin with many proximal setae and 4 robust setae, anterodistal corner bearing 2 robust setae, posterior margin serrated, medial surface with vertical ridge bearing a robust seta; ischium with a robust seta at anterodistal corner; merus–dactylus lost. Pereopod 6, coxa anterior margin straight, with a seta, posteroventral margin with 6 small notches; basis longish ovoid, with anterolateral ridge, anterior margin with many proximal setae and 4 robust setae, anterodistal corner bearing a robust seta, posterior margin serrated, medial surface with vertical ridge bearing a robust seta; ischium with a slender seta at anterodistal corner; merus with 1+2+2+2 anterior, 2 anterodistal, 3 posterior and 2 posterodistal robust setae; carpus–dactylus lost. Pereopod 7, coxa short, oval, posteroventral margin with 3 small notches; basis ovoid, with anterolateral ridge, anterior margin with many proximal setae and 4 robust setae, anterodistal corner bearing a robust seta, posterior margin serrated, medial surface with short vertical ridge bearing a robust seta (damaged); merus with 1+1+2 anterior, 3 anterodistal, 4 posterior and 3 posterodistal robust setae; carpus–dactylus lost. Pleon (Figs 17, 20). Pleonites 1, 2 acutely projected posterodorsally. Epimeral plates 1–3, posteroventral corners minutely produced in plates 1, 3 and strongly produced in plate 2, lateral surfaces with ridge in plates 1, 2, ventral margins bearing 1 and 2 robust setae in plates 2 and 3, respectively. Pleopods, pleopod 2 longest; each peduncle bearing several setae and 2 coupling hooks, peduncles with 1, 2 and 5 robust setae posteromedially in pleopods 1–3, respectively, peduncle of pleopod 3 also bearing a lateral robust seta; outer rami with 14 articles, inner rami with 15, 14 and 12 articles, respectively. Uropod 1, peduncle long, dorsal surface with 6 lateral, 1 laterodistal, 5 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus damaged, with 2+ (1 lost) lateral robust setae; inner ramus ca. 0.9 times as long as peduncle, with 3 lateral, 3 medial and 4 terminal robust setae. Uropod 2 about 0.9 times as long as uropod 1; peduncle short, with 3 lateral, 1 laterodistal, 1 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.75 times length of peduncle, with 2 lateral and 4 (1 lost) terminal robust setae; inner ramus ca. 2.2 times as long as outer ramus, with 5 lateral, 4 medial and 4 terminal robust setae. Uropod 3 about 0.9 times length of uropod 2; peduncle very short, longer than wide, ventrodistal end acutely produced, dorsal and ventral surfaces with several setae, posterodistal corner bearing a seta; outer ramus ca. 1.65 times length of peduncle, with 4 lateral and 3 medial robust setae; inner ramus about 1.6 times as long as outer ramus, with 8 (2 lost) lateral and 11 medial robust setae. Telson small, trapezoidal, distal margin truncated, dorsal surface with pair of 2+1 sensory setae, each lateral margin bearing 4 minute setae. Description of male. Based on paratype, male, 4.0 mm (OMNH-Ar-13227). Almost similar to holotype, ovigerous female, 5.1 mm (OMNH-Ar-13222) except for oostegites. Gnathopods resembling those of female; but gnathopod 1 coxa with a small notch each on anteroventral and posteroventral corners, basis slightly setose, with medial long seta (Fig. 20 M-G1), and gnathopod 2 coxa bearing a small notch each on anteroventral and posteroventral corners, propodus posterodistal corner with 3 (2 lateral and 1 medial) short robust setae (Fig. 20 M-G2). Coloration in life. Based on paratype, ovigerous female, 5.1 mm (OMNH-Ar-13223, Fig. 21). Head pale orange with orange posterior margin, eyes bright red; pereonites, pleonites and coxae pale orange with orange margins, lateral surfaces of pleonites 1, 2 each with distinct orange mark mid-posteriorly; antennae peduncles pale orange to white with orange distal margins, flagella faintly-orangish white; gnathopods, pereopods, pleopods and uropods faintly-orangish white, but bases and meri of pereopods 5–7 partly orange. Remarks. Lobatoradarea kagoshimensis sp. nov. is characterized by a combination of the large eyes and the strongly produced posteroventral corner of the epimeral plate 2. This combination is unique in the genus. Habitat. Fish reef on sandy-mud bottom with a depth of 21– 23 m. Distribution. Japan: Kagoshima Bay in Kagoshima Prefecture (present study).