taxonID	type	description	language	source
3612968751E753D1B53EFC2330C3657B.taxon	description	Figs 1, 2, 3, 4	en	Wang, Yanrong, Sha, Zhongli, Ren, Xianqiu (2023): A new species of Orchomenella (Amphipoda, Tryphosidae) described from hydrothermal vent in the Okinawa Trough, Northwest Pacific. ZooKeys 1184: 261-271, DOI: http://dx.doi.org/10.3897/zookeys.1184.111420, URL: http://dx.doi.org/10.3897/zookeys.1184.111420
3612968751E753D1B53EFC2330C3657B.taxon	materials_examined	Materials examined. Holotype. MBM 286555, ♀ (6.2 mm), dissected, Okinawa Trough, 27 ° 33 ' N, 126 ° 58 ' E, RY 0067, ROV- 3, depth 1243 m, 16 April 2014. Paratype: MBM 286555, ♂ (5.6 mm), same collection data as holotype.	en	Wang, Yanrong, Sha, Zhongli, Ren, Xianqiu (2023): A new species of Orchomenella (Amphipoda, Tryphosidae) described from hydrothermal vent in the Okinawa Trough, Northwest Pacific. ZooKeys 1184: 261-271, DOI: http://dx.doi.org/10.3897/zookeys.1184.111420, URL: http://dx.doi.org/10.3897/zookeys.1184.111420
3612968751E753D1B53EFC2330C3657B.taxon	materials_examined	Additional materials. MBM 286566, 4 ♀ ♂, Okinawa Trough, 27 ° 33 ' N, 126 ° 58 ' E, RY 0069, ROV- 3, depth 1243 m, 16 Apr. 2014.	en	Wang, Yanrong, Sha, Zhongli, Ren, Xianqiu (2023): A new species of Orchomenella (Amphipoda, Tryphosidae) described from hydrothermal vent in the Okinawa Trough, Northwest Pacific. ZooKeys 1184: 261-271, DOI: http://dx.doi.org/10.3897/zookeys.1184.111420, URL: http://dx.doi.org/10.3897/zookeys.1184.111420
3612968751E753D1B53EFC2330C3657B.taxon	description	Description. Body smooth; epimerons 1 - 3 smooth, posteroventral margin rounded; urosomite 1 bearing dorsal notch. Head: head deeper than long; lateral cephalic lobe large, subtriangular, subacute apically. Eyes: no trace visible in ethanol-preserved materials. Antenna 1 with peduncular article 1 longest, length ~ 1.5 x width, without dorsodistal protrusion, article 3 subequal to article 2; flagellum 9 - articulate, with callynophore, without calceoli; accessory flagellum long, 5 - articulate, article 1 longest, not forming cap. Antenna 2 longer than antenna 1; peduncle without brush setae, article 4 longer than article 5; flagellum 7 - articulate, shorter than peduncle, without calceoli. Mouthparts. Upper and lower lip typical for the genus. Mandible incisors symmetrical, smooth, subtriangular; left lacinia mobilis a long, slender peg; accessory setal row without distal setal tuft, both left and right with 3 short, slender, simple setae; molar well developed, columnar; palp 3 - articulate, attached lower than molar, article 1 shortest, article 3 blade-like, shorter than article 2, fringed with long simple setae. Maxilla 1 with inner plate narrow with 2 pappose apical setae; outer plate with 11 setal-teeth in 7 / 4 crown arrangement; palp large, 2 - articulate, with 9 terminal short robust setae and 1 long, plumose seta. Maxilla 2 inner plate narrower and slightly shorter than outer plate. Maxilliped with inner plate rectangular, distal margin with teeth and 1 or 2 robust setae; outer plate does not extend to distal margin of palp article 3, with 2 apical, robust setae; palp 4 - articulate, dactylus nearly as long as article 3, unguis present. Coxae 1 - 4 longer than broad, overlapping. Gills present on coxae 2 - 7; pereopod 5 and 6 bearing accessory gill. Oostegites slender, present on coxae 2 - 5. Pereopods. Gnathopod 1 subchelate; coxa anterior margin slightly concave, posterior margin nearly straight; basis slender, anterior margin fringed with thin, simple setae; ischium shorter than merus; merus shorter than carpus, with distal margin bearing 4 long setae; carpus slightly shorter than propodus; propodus subrectangular, posterior margin straight, posterodistal corner with a group of simple setae, without robust setae; dactylus simple, as long as palm. Gnathopod 2 minutely chelate, with distal 3 articles distinctly compressed compared to other articles; coxa large, subequal in size to coxa 3; ischium 1.8 x longer than merus; carpus compressed, 1.6 x longer than propodus, posterior margin strongly convex, anterior margin nearly straight; propodus subrectangular; dactylus reaching corner of palm, tufts of setae covering most of distal part of propodus. Pereopod 3 coxa large; merus with posterior margin bearing simple, long setae; propodus with posterior margin bearing small, robust setae; dactylus slender. Pereopod 4 coxa large, with large posteroventral lobe, anterior margin convex; ischium to carpus with posterior margin bearing simple, long setae; propodus nearly as long as merus, posterior margin with small robust setae; dactylus slender. Pereopod 5 coxa slightly deeper than wide, posterior lobe slightly larger than anterior one; basis broadly expanded with posterior and anterior margin bearing small robust setae; merus longer than carpus, slightly expanded posteriorly; propodus with anterior margin bearing 4 small, robust setae; dactylus slender. Pereopod 6 coxa posterior lobate; basis expanded, posterior and anterior margin bearing small, robust setae; merus subequal in length to carpus, anterior margin with robust setae, posterior margin bearing 1 distal and 1 subdistal seta; propodus with small, robust setae along anterior and posterior margins; dactylus slender. Pereopod 7 with coxa small; basis wider than that of pereopod 6, posterior margin broadly rounded; distal 5 articles similar to that of pereopod 6. Uropods and telson. Uropod 1 peduncle longer than rami, with 4 dorsomedial and 1 apicomedial robust setae; outer ramus slightly longer than inner ramus; inner ramus with 2 dorsal robust setae. Uropod 2 peduncle subequal in length to rami, with 1 apicolateral, 1 dorsolateral, and 1 apicomedial robust seta; outer ramus slightly longer than inner ramus, with 3 dorsal, robust setae; inner ramus with 2 dorsal, robust setae. Uropod 3 peduncle slightly shorter than outer ramus, with 6 robust setae; outer ramus 2 - articulate, article 1 with 2 lateral and 2 distal robust setae, article 2 about 0.5 x length of article 1; inner ramus not reaching to base of article 2 of outer ramus, with 2 lateral robust setae. Telson cleft, about 68 %, bearing 3 dorsal and 1 apical robust setae on each side.	en	Wang, Yanrong, Sha, Zhongli, Ren, Xianqiu (2023): A new species of Orchomenella (Amphipoda, Tryphosidae) described from hydrothermal vent in the Okinawa Trough, Northwest Pacific. ZooKeys 1184: 261-271, DOI: http://dx.doi.org/10.3897/zookeys.1184.111420, URL: http://dx.doi.org/10.3897/zookeys.1184.111420
3612968751E753D1B53EFC2330C3657B.taxon	etymology	Etymology. From the Latin Orchomenella compressa (= compressed), referring to the compressed distal 3 articles of the gnathopod 2.	en	Wang, Yanrong, Sha, Zhongli, Ren, Xianqiu (2023): A new species of Orchomenella (Amphipoda, Tryphosidae) described from hydrothermal vent in the Okinawa Trough, Northwest Pacific. ZooKeys 1184: 261-271, DOI: http://dx.doi.org/10.3897/zookeys.1184.111420, URL: http://dx.doi.org/10.3897/zookeys.1184.111420
3612968751E753D1B53EFC2330C3657B.taxon	distribution	Distribution. Presently known only from Okinawa Trough, at a depth of 1243 m.	en	Wang, Yanrong, Sha, Zhongli, Ren, Xianqiu (2023): A new species of Orchomenella (Amphipoda, Tryphosidae) described from hydrothermal vent in the Okinawa Trough, Northwest Pacific. ZooKeys 1184: 261-271, DOI: http://dx.doi.org/10.3897/zookeys.1184.111420, URL: http://dx.doi.org/10.3897/zookeys.1184.111420
