Leucothoe akuma White & Reimer 2012

Head. Anterior margin rounded, anterodistal margin evenly rounded, distal margin rounded; ventral cephalic keel anterior margin excavate, anteroventral margin quadrate, projected anteriorly, ventral margin convex; eyes present with more than 10 ommatidia, round. Antenna 1 0.3 × body length, flagellum 10–articulate, peduncle article 1 width less than 2 × article 2, accessory flagellum 1–articulate. Antenna 2 0.3 × body length, subequal in length with antenna 1, flagellum 7–articulate. Mandibular palp ratio of articles 1–3 1.0: 2.6: 1.8, article 2 with 8 distal setae, article 3 with one distal seta; incisors strongly dentate; left mandible with 7 raker spines, lacinia mobilis large, weakly toothed; right mandible with 7 raker spines, lacinia mobilis small, weakly toothed. Upper lip asymmetrically lobate, anterior margin setose. Lower lip inner lobes fused, setose; outer lobes with small gape, anterior margins setose. Maxilla 1 palp 2-articulate with 3 distal setae; outer plate with 5 distal robust setae. Maxilla 2 inner plate with 7 distal setae; outer plate with 7 slender distal setae, 4 slender and 4 robust marginal setae. Maxilliped inner plates distal margin with v-shaped indentation, with short simple robust setae; outer plate inner margin smooth, reaching 0.3 × palp article 1, with simple marginal setae, facial setae absent; palp article 4 subequal in length with article 3, distally acute. Pereon. Coxae 1–4 relative widths 1.0: 1.1: 0.7: 1.3. Gnathopod 1 coxa smooth, with tiny marginal setae, anterodistal margin produced, subquadrate, distal margin straight, posterior margin excavate, facial setae absent; basis distally expanded, anterior margin with 3 short setae, posterior margin bare; ischium bare; carpus linear, distal length 12.9 × width, proximal margin smooth, distal margin with 3 setae; propodus straight, palm dentate with 5 large and several small distal setae; dactylus smooth, reaching 0.3 × propodus length. Gnathopod 2 coxa broader than long, subequal in size with coxa 3, smooth, with tiny marginal setae, anterior margin straight, anterodistally rounded, distal and posterior margins straight, facial setae absent; basis distally expanded, anterior margin with 7 short and long setae, posterior margin bare except for 1 small posterodistal seta; ischium with distal and posterodistal setae; carpus 0.4 × propodus length, curved, distally truncate, anterior margin dentate; propodus with 2 mediofacial setal rows, primary row above midline, reaching 0.7 × propodus length, secondary row reaching to insertion of dactylus, with 1 row of submarginal setae, posterior margin smooth, palm convex with 2 large distal tubercles; dactylus curved, proximal margin smooth, setose, anterior margin distally acute, reaching 0.6 × propodus length. Pereopod 3 coxa length 1.4 × width, anterodistal corner overriding distal face of coxa 2 and extending below it, smooth, with tiny marginal setae, anterior margin straight, distal margin convex, posterior margin straight, facial setae absent. Pereopod 4 smooth, with tiny marginal setae, anterior margin straight, distal margin rounded, posterior margin tapered, facial setae absent. Pereopods 5–7 coxae facial setae present; bases width length ratios 1: 1.3, 1: 1.2, 1: 1.1, posterior margins smooth. Pereopod 5 basis posterior margin bare, pereopods 6–7 bases posterior margins setose. Pleon. Epimera 1–3 with ventral setae; epimeron 3 posteroventral corner rounded. Uropods 1–3 relative lengths 1.0: 0.7: 1.0. Uropod 1 peduncle 0.9 × inner ramus length, outer ramus length 0.8 × inner ramus length; inner ramus with 5 robust setae, outer ramus with 4 robust setae. Uropod 2 peduncle 0.8 × inner ramus length, outer ramus 0.7 × inner ramus length; inner ramus with 4 robust setae, outer ramus with 3 robust setae. Uropod 3 peduncle and outer ramus subequal in length with inner ramus; inner ramus with 5 robust setae, outer ramus with 3 robust setae. Telson 2.4 × longer than wide, apex tridentate.

East China Sea: Okinawa–jima Island (Okinawa) and Okinoerabu–jima Island (Kagoshima), Japan.