taxonID	type	description	language	source
84656FB39CF95599A3F48FD8FA67E5D2.taxon	type_taxon	Type species. Orchestia floresiana Weber, 1892, original designation.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
84656FB39CF95599A3F48FD8FA67E5D2.taxon	description	Diagnostic description. (modified from Lowry and Springthorpe 2009, 2015) Antenna 1 short, not longer than article 4 of antenna 2 peduncle. Antenna 2 peduncular articles slender; article 3 without ventral process. Left mandible lacinia mobilis 4 – 5 - cuspidate. Maxilliped palp article 2 distomedial lobe well developed, article 4 reduced, button-shaped. Gnathopod 1 sexually dimorphic; subchelate; posterior margin of merus, carpus and propodus each with lobe covered in palmate setae. Gnathopod 2 sexually dimorphic; subchelate; dactylus distally attenuated (except Floresorchestia papeari Lowry & Springthorpe, 2015 and F. ancheidos (H. K. Barnard, 1916 )). Pereopods 3 – 7 cuspidactylate (except F. odishi Bhoi, Myers, Kumar & Patro, 2024; pereopods 6 and 7 unidactylate). Pereopods 6 and 7 not sexually dimorphic. Pleopods all well developed, biramous. Epimera 1 – 3, 2 and 3, or 2 with slits just above ventral margins, vestigial on epimera 1 (except F. xueli Tong, Hoa, Liu, Li & Hou, 2021). Uropods 1, 2 not sexually dimorphic. Uropod 1 outer ramus without marginal robust setae. Uropod 2 outer ramus with marginal robust setae. Uropod 3 ramus subequal in length to peduncle. Telson with 3 – 7 robust setae. Female (sexually dimorphic characters). Gnathopod 1 posterior margin of merus, carpus and propodus each without lobe covered in palmate setae. Gnathopod 2 mitten-shaped. Oostegites on gnathopod 2 to pereopod 5; setae straight.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
8745F25B0E4654F6A8990C4E118215D6.taxon	description	Figs 3, 4, 5, 6	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
8745F25B0E4654F6A8990C4E118215D6.taxon	diagnosis	Diagnosis. Mandible lacinia mobilis 4 - dentate. Gnathopod 1 with palmate lobes on merus, carpus and propodus; palm acute. Gnathopod 2 propodus palm reaching ~ 33 % along posterior margin; dactylus attenuated distally. Pereopod 4 dactylus thickened proximally, with slight notch midway along posterior margin. Epimeron 2 and 3 with slits just above ventral margins. Uropod 1 outer ramus without marginal robust seta, with three marginal robust setae in one row. Uropod 3 peduncle with one robust seta; ramus with two apical robust setae. Telson with one apical robust seta, and two lateral robust seta per lobe.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
8745F25B0E4654F6A8990C4E118215D6.taxon	description	Description. Based on male holotype 8.7 mm, THNHM-lv- 20866. Head. Eye large (> 1 / 3 head length). Antenna 1 (Fig. 3, A 1) short, rarely longer than article 4 of antenna 2 peduncle. Antenna 2 (Fig. 3, A 2) <1 / 2 body length, peduncular articles slender, article 5 longer than article 4. Upper lip (Fig. 4, UL) without robust setae, broad, rounded apex, apical marginal with fine setule. Lower lip (Fig. 4, LL) without inner plate, with fine setule on apex and inner margin. Left mandible (Fig. 4, LMD) incisor 5 - dentate; left lacinia mobilis 4 - dentate and five pappose setae type I in one row; molar strong with 20 striations and one pappose setae type II on the distal of molar. Right mandible (Fig. 4, RMD) incisor 5 - dentate; lacinia mobilis with numerous cusps; molar strong with 26 striations and 1 distal pappose seta. Maxilla 1 (Fig. 4, MX 1) inner plate slender with 2 apical papposerrate setae type I; outer plate with 9 robust serrate setae type I and small palp 2 - articulate on outer lateral margin. Maxilla 2 (Fig. 4, MX 2) inner plate slightly shorter than outer plate, subapical margin with 19 robust setae, with one mediolateral papposerrate seta type I: outer plate with 18 apical robust setae in two rows. Maxilliped (Fig. 4, MP) inner plate apical and subapical margins with papposerrate setae type II, and two large conical robust setae; outer plate subapical margin with robust setae and two pappose setae; palp article 2 distomedial lobe well developed; article 4 reduced, button shaped. Pereon. Gnathopod 1 (Fig. 3, G 1) sexually dimorphic; subchelate; coxa smaller than coxa 2, anterior margin slightly convex distally; basis slightly expanded posteriorly, anterior margin with four robust setae, posterior margin with two marginal robust setae and two terminal robust setae; ischium subquadrate, shortest, anterior lobe slightly rounded; posterior margin of merus, carpus and propodus each with lobe covered in palmate setae; carpus longer than propodus, carpus 1.27 × as long as propodus, carpus 1.9 × as long as broad; propodus ‘ subtriangular’ with well-developed posterodistal lobe, anterior margin with three groups of robust setae, lateral surface with four cuspidate setae, posterolateral surface with three serrate setae, medial surface with five cuspidate setae, posterior margin without cuspidate setae, with three serrate setae; palm transverse, with five serrate setae; dactylus longer than palm, without spine patch on posterodistal corner. Gnathopod 2 (Fig. 3, G 2) sexually dimorphic; subchelate; coxal gill simple (or slightly lobate); basis slightly expanded; ischium with distally rounded posterodistal lobe on medial surface; posterior margin of merus, carpus and propodus each without lobe covered in palmate setae; carpus reduced, enclosed by merus and propodus, posterior absent, not projecting between merus and propodus; propodus subovate, 1.4 × as long as wide; palm acute, reaching ~ 33 % along posterior margin, smooth, evenly rounded, lined with robust setae, posteromedial surface of propodus with groove, without cuticular patch at corner of palm; dactylus longer than palm, without anteroproximal bump, posterior margin smooth, attenuate distally; gill lobate. Pereopods 3 – 4 (Fig. 5, P 3 – P 7) coxae wider than deep. Pereopods 3 – 7 cuspidactylate; dactyli without anterodistal patch of many rows of tiny setae. Pereopod 3 (Fig. 5, P 3) coxa wider than deep, ventral margin with four robust setae, posterior margin with acute process; basis slightly expanded, anterior margin slightly straight and naked, posterior margin with four robust setae; ischium subrectangular, shortest; merus longer than carpus and propodus, distally expanded, anterior margin with four robust setae, posterior margin with four robust setae; carpus as long as propodus, anterior margin with three setae, posterior margin with four robust setae; propodus slender, anterior margin with three robust setae, posterior margin with eight robust setae; dactylus without notch on posterior margin, anterior corner with one robust seta and posterior inner view with two robust setae. Pereopod 4 (Fig. 5, P 4) significantly shorter than pereopod 3; coxa wider than deep, posterior margin with acute process; basis slightly expanded distally, anterior margin distally convex, posterior margin with five robust setae; ischium shortest, subquadrate, distally convex; merus longer than carpus and propodus; carpus significantly shorter than carpus of pereopod 3; propodus slender, anterior margin with three groups of robust setae, posterior margin with three groups of robust setae; dactylus thickened proximally with a notch midway along posterior margin, dactylus without anterodistal setal patch. Pereopod 5 (Fig. 5, P 5) coxa bilobed, anterior lobe distinctly larger than posterior lobe, posterior lobe with setae on ventral margin; basis ovate, anterior margin with eight robust setae, posterior margin with five minute setae; ischium shortest, subrectangular, posterior margin distally convex; merus as long as carpus, distally expanded, anterior margin with five robust setae; carpus shorter than propodus, anterior margin with seven robust setae, posterior margin with one marginal robust seta and three robust setae distally; propodus distinctly longer than carpus; dactylus without anterodistal setal patch. Pereopods 6 – 7 (Fig. 5, P 6 and P 7) not sexually dimorphic. Pereopod 6 (Fig. 5, P 6) subequal in length to pereopod 7; coxa posterior lobe larger than anterior lobe, inner view posteroventral corner rounded, posterior margin perpendicular to ventral margin, posterior lobe without ridge, without marginal setae; basis ovate, anterior margin with eight robust setae, posterior margin with nine or ten minute setae; ischium shortest; merus slightly expanded, anterior margin crenulate with six robust setae, posterior margin convex with three robust setae; carpus as long as merus, anterior margin crenulate with eight robust setae, posterior margin with six robust setae in three groups; propodus longer than carpus, slender, anterior margin with eight robust setae in four groups, posterior margin with nine robust setae; dactylus slender with setae in posterior corner. Pereopod 7 (Fig. 5, P 7) coxa reduced; basis sub ovate, lateral sulcus absent, posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present, shallow, broadly rounded; ischium shortest, subrectangular with posterior rounded process; merus posterior margin expanded distally, subtriangular; propodus slightly longer than carpus, anterior margin with seven robust setae, posterior margin with eight robust setae and three terminal minute setae; dactylus slender and with subapical setae. Pleon. Pleopods 1 – 3 well developed, biramous; peduncle ventral margin without robust setae; rami without ventral robust setae. Pleopod 1 (Fig. 6, PL 1) peduncle longer than rami; inner ramus subequal in length to outer ramus, with eight articles; outer ramus with nine articles. Pleopod 2 (Fig. 6, PL 2) peduncle longer than rami; inner ramus with eight robust setae; outer ramus with eight robust setae. Pleopod 3 (Fig. 6, PL 3) peduncle longer than rami; inner ramus with nine robust setae; outer ramus with seven robust setae. Epimeron 1 (Fig. 6, EP) posterior corner slightly projecting, and without slits. Epimera 2 and 3 each with slits above ventral margin; posterior ventral corner and ventral margin smooth. Uropod 1 (Fig. 6, U 1) peduncle slightly longer than ramus with 6 robust setae, distolateral robust seta present, small (<1 / 4 length of outer ramus), with simple tip; inner ramus subequal in length to outer ramus, inner ramus with three marginal robust setae (1 row), with four apical robust setae; outer ramus without marginal robust setae. Uropod 2 (Fig. 6, U 2) not sexually dimorphic; peduncle shorter than rami with 3 robust setae; inner ramus subequal in length to outer ramus, with marginal robust setae, with one lateral robust seta; outer ramus with marginal robust setae in one row. Uropod 3 (Fig. 6, U 3) peduncle longer than ramus with one robust seta; ramus not fused to peduncle; ramus 1.6 × as long as broad. Telson (Fig. 6, T) longer than broad, apically incised, dorsal midline less than halfway, with one apical robust seta, and two lateral robust setae. Female (Fig. 6) (sexually dimorphic characters). Based on allotype, female 4.7 mm. THNHM-lv- 20867. Pereon. Gnathopod 1 (Fig. 6, G 1 ♀) parachelate; coxa anterior margin straight, anteroventral margin with three robust setae; basis slender, anterior margin straight, posterior margin slightly expanded distally with two subterminal robust setae; ischium shortest, subrectangular, anterior margin slightly convex; posterior margin of merus, carpus and propodus without lobe covered in palmate setae; merus triangular with two groups of robust setae on posterior margin; carpus subtriangular, anterior margin curved with four terminal setae, posterior margin slightly convex with three robust setae; propodus slender, anterior margin crenulate with two marginal robust setae and four terminal setae, posterior margin crenulate with three lateromedial robust setae; dactylus slender, anterior corner with one robust seta, posterior margin with one seta and two lateromedial robust setae. Gnathopod 2 (Fig. 6, G 2 ♀) mitten-shaped; coxa as long as deep, anterior margin straight, posterior margin straight, ventral margin with minute setae; basis expanded, anterior margin naked, posterior margin straight with one seta; ischium as long as merus, anterior margin with rounded lobe, posterior margin straight with one terminal seta; merus shorter than carpus, anterior margin with rounded lobe, posterior margin with rounded lobe; carpus and propodus each with lobe covered in palmate setae; carpus subtriangular, longer than propodus; propodus subovate, lateromedial corner with three robust setae; dactylus slender, shorter than palm, anterior margin with one robust seta, posterior margin with two robust setae.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
8745F25B0E4654F6A8990C4E118215D6.taxon	distribution	Distribution. Thailand. Trat town Municipality, Trat.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
8745F25B0E4654F6A8990C4E118215D6.taxon	etymology	Etymology. Named for the character of three robust setae on each telsonic lobe.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
E37C7474080E5EAAB81BC594F65D4612.taxon	description	Figs 8, 9, 10, 11, 12	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
E37C7474080E5EAAB81BC594F65D4612.taxon	diagnosis	Diagnosis. Male antenna 2 and pereopod 7 strongly sexually dimorphic. Male gnathopod 1 rudimentary cusp on dactylus. Male gnathopod 2 propodus without notch on palmar margin. Coxa 6 posterior lobe with anterodistal corner subquadrate, with process, one or two marginal setae, posterior margin perpendicular to ventral margin, outer surface with ridge. Pleopod 2 with two marginal robust setae; pleopod 3 with three marginal robust setae. Uropod 1 peduncle with nine or ten robust setae in two rows. Uropod 3 ramus with one marginal robust seta.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
E37C7474080E5EAAB81BC594F65D4612.taxon	description	Description. Based on holotype, male, 8.72 mm, THNHM-lv- 20869. Head. Eye medium ~ 1 / 3 – 1 / 5 of head length. Antenna 1 (Fig. 8, A 1) short, slightly longer than article 4 of antenna 2. Antenna 2 (Fig. 8, A 2) slightly incrassate, shorter than half body length; peduncular articles occasionally expanded, with small setae along the peduncle; article 4 shorter than article 5; flagellum with 15 articles, final article cone-shaped with apical cluster of setae. Upper lip (Fig. 9, UL) broad, deep, apex round, without robust setae, apical margin with fine setules. Lower lip (Fig. 9, LL) present; without inner plate, with fine setules on the apex and inner margins. Left mandible (Fig. 9, LMD) incisor 5 - dentate; lacinia mobilis 5 - dentate, with six pappose setae type I in one row; molar strong and concave, with 22 striations, with cluster of fine setae on anterior side and one pappose setae type II on the dorsal side of molar. Right mandible (Fig. 9, RMD) incisor 5 - dentate; lacinia mobilis with numerous cusps and four pappose setae type I in one row; molar strong and convex, with 22 striations, with cluster of fine setae on anterior side and one pappose seta type II on the dorsal side. Maxilla 1 (Fig. 9, MX 1) inner plate slender with two apical papposerrate setae type I; outer plate with seven robust serrate setae type I; outer margin with small 2 - articulate palp. Maxilla 2 (Fig. 9, MX 2) inner plate slightly shorter than outer plate; with 25 subapical setae, one papposerrate seta type I and 15 simple slender setae on inner margin; outer plate with 12 simple setae type I and one papposerrate seta type I, inner margin with four robust setae. Maxilliped (Fig. 9, MP) inner plate with apical papposerrate setae type II and three large conical robust setae; outer plate with apical papposerrate setae; palp article two distomedial lobe well developed with numerous simple setae; article 4 present, reduced. Pereon. Gnathopod 1 (Fig. 8, G 1) sexually dimorphic; subchelate, coxa smaller than coxa 2, ventral margin with eight robust setae, anterior margin straight; basis expanded posteriorly, anterior margin with six robust setae, posterior margin with four robust setae; posterior margin of carpus and propodus each with lobe covered in palmate setae; ischium shortest; merus and carpus triangular; carpus 1.3 × longer than propodus; propodus subtriangular with well-developed posterior lobe, palm straight with four robust setae in one row; dactylus cuspidactylate, shorter than palm. Gnathopod 2 (Fig. 8, G 2) sexually dimorphic; subchelate; coxa as wide as deep without posterior process, ventral margin convex with 13 robust setae; basis expanded, anterior margin straight with six robust setae, posterior margin slightly concave with six robust setae; ischium subrectangular, anterior margin without notch; merus subequal in length to carpus, convex on posterior margin; carpus triangular; reduce; enclosed by merus and propodus, posterior lobe absent; propodus subovate, palm acute and reaching 34.5 – 35 % along posterior margin, 1.5 × as long as wide, posteromedial surface of propodus with groove, anterior margin with one distal robust seta, palmar margin slightly convex with 14 robust setae; dactylus longer than palm and fitting in facial groove of propodus, attenuated distally. Pereopod 3 (Fig. 10, P 3) coxa wider than deep without posterior process, ventral margin slightly convex and with 15 robust setae, anterior margin straight, anterior and posterior margins naked; basis slightly expanded distally, anterior margin straight with six robust setae, posterior margin slightly crenulate, with four groups of robust setae; ischium shortest, anterior margin with rounded process; merus slightly expanded, longer than carpus and propodus, anterior margin slightly rough and with seven robust setae, posterior margin slightly straight and with ten robust setae; carpus as long as propodus, anterior margin with three robust setae, posterior margin with five robust setae; propodus anterior margin with three groups of two robust setae in each group, posterior margin with three groups of three robust setae in each group, with two distal robust setae; dactylus posterior margin with one seta on anterior margin. Pereopod 4 (Fig. 10, P 4) similar to pereopod 3 but shorter; coxa subrectangular, wider than deep, posterior margin with posterior process, ventral margin with 13 robust setae; basis slightly expanded distally, anterior margin with group of distal robust setae; ischium shortest, anterior margin convex, posterior margin straight with two robust setae; merus slightly expanded, longer than carpus and propodus, anterior margin crenulate with six robust setae, posterior margin crenulate with four groups of robust setae with two robust setae in each group; carpus as long as propodus, anterior margin straight with three robust setae, posterior margin slightly crenulate with seven robust setae; propodus slender, anterior margin with seven robust setae, posterior margin with three groups of robust setae; dactylus slender and longer than pereopod 3, thickened proximally with notch along posterior margin. Pereopod 5 (Fig. 10, P 5) coxa bilobed, anterior lobe distinctly larger than posterior lobe, ventral margin with minute setae; basis ovate, anterior margin with seven robust setae, posterior margin with eight minute setae; ischium subrectangular, shortest, posterior margin notched; merus expanded distally, subequal in length to carpus, anterior margin slightly concave with seven robust setae, posterior margin convex with seven robust setae; carpus anterior margin crenulate with three groups of robust setae with three robust setae in each group, posterior margin slightly straight; propodus slender, longer than merus and carpus, anterior margin with four groups of robust setae with three robust setae in each group, posterior margin crenulate with five robust setae; dactylus with two robust setae on anterior margin. Pereopod 6 (Fig. 10, P 6) coxa bilobed, anterior lobe very small, anterior margin straight, posterior lobe inner view posteroventral corner rounded, posterior margin perpendicular to ventral margin, ventral margin serrate and with minute setae; basis ovate, anterior margin with eight robust setae, posterior margin with six minute setae; ischium shortest; anterior margin straight, posterior margin with rounded process; merus slightly expanded, anterior margin crenulate, with nine robust setae, posterior margin convex and with six robust setae; carpus as long as merus, anterior margin crenulate and with four groups of robust setae, posterior margin crenulate with four groups of robust setae; propodus longer than merus and carpus, anterior margin slightly crenulate with 13 robust setae, posterior margin slightly crenulate with 16 robust setae; dactylus slender with subapical robust setae. Pereopod 7 (Fig. 10, P 7) not sexually dimorphic, coxa reduced, ventral margin with minute setae; basis expanded without lateral sulcus, posterodistal lobe present, anterior margin with ten robust setae, posterior margin serrate with minute setae, ischium shortest with posterior process; merus as long as carpus, anterior margin slightly crenulate with ten robust setae, posterior margin with posteroventral lobe and five robust setae; carpus oblong; anterior margin slightly crenulate with eight robust setae, posterior margin crenulate with six robust setae; propodus slender, longer than merus and carpus, 1.17 × as long as carpus anterior margin with 13 robust setae, posterior margin with eight robust setae; dactylus slender, apically acute without robust setae. Pleon. Pleopods 1 – 3 well developed, biramous; Pleopod 1 (Fig. 11, PL 1) peduncle longer than rami, without marginal robust setae; inner ramus as long as outer ramus, with 15 articles; outer ramus with 14 articles. Pleopod 2 (Fig. 11, PL 2) peduncle slightly longer than rami, with marginal robust setae on posterior margin; inner ramus as long as outer ramus, with 12 articles; outer ramus with 12 articles. Pleopod 3 (Fig. 11, PL 3) peduncle longer than rami, posterodistal margin with 3 robust setae; inner ramus longer than outer ramus. with 11 articles; outer ramus with ten articles. Epimera 1 – 3 posterior margin slightly serrate, posteroventral corners of epimera 2 and 3 reduced. Uropod 1 (Fig. 11, U 1) peduncle 1.5 × longer than rami, with seven robust setae in two rows, without distolateral robust setae; inner ramus subequal in length to outer ramus, with four marginal robust setae and three apical robust setae; outer ramus without marginal robust setae and with three apical robust setae. Uropod 2 (Fig. 11, U 2) peduncle 1.3 × longer than rami, with four marginal robust setae; inner ramus with four marginal robust setae and 3 apical robust setae; outer ramus with one or two marginal robust setae and three apical robust setae. Uropod 3 (Fig. 11, U 3) peduncle subequal in length to ramus, with three robust setae; ramus slender, more than 3.5 × longer than broad, with one marginal robust seta and four apical robust setae. Telson (Fig. 11, T) longer than broad, apically incised, with three marginal robust setae and three apical robust setae per lobe; dorsal midline entire. Male (minor form). Based on paratype, male 7.9 mm. THNHM-lv- 20871. Head. Antenna 2 (Fig. 12, A 2) peduncle not incrassate, peduncle slender. Pereon. Gnathopod 1 (Fig. 12, G 1); basis slightly expanded posteriorly, anterior margin with two robust setae, posterior margin with two robust setae; carpus 1.4 × longer than propodus; propodus anterior margin with two groups of robust setae; dactylus subequal to palm. Gnathopod 2 (Fig. 12, G 2) coxa ventral margin with ten robust setae; basis anterior margin slightly concave with two robust setae, posterior margin expanded with four robust setae; ischium subrectangular, anterior margin with lobe; merus longer than carpus, convex on posterior margin; carpus triangular; reduced; enclosed by merus and propodus, posterior lobe absent; propodus subovate, palm acute reaching 45 % along posterior margin, 1.4 × as long as wide, palmar margin slightly convex with six robust setae; dactylus longer than palm and fitting in facial groove of propodus, attenuated distally. Female (sexually dimorphic characters) based on allotype type, female 7.8 mm. THNHM-lv- 20870. Pereon. Antenna 2 (Fig. 12, A 2 ♀) peduncle slender. Gnathopod 1 (Fig. 12, G 1 ♀) parachelate; posterior margin of merus, carpus and propodus without lobe covered in palmate setae; basis slightly expanded with posterodistal rounded process, anterior margin with six robust setae, posterior margin with three robust setae; ischium shortest, anterior margin with rounded lobe; merus triangular, posterior margin with six robust setae; carpus subtriangular, anterior margin straight with four robust setae, posterior margin convex with six robust setae in two groups, propodus subrectangular, palm acute, anterior margin with nine robust setae, posterior margin with 11 robust setae; dactylus much longer than palm, posterior margin with three robust setae. Gnathopod 2 (Fig. 12, G 2 ♀) mitten-shaped, coxa posterior margin with acute process, ventral margin with minute setae; basis expanded, anterior margin convex with minute setae; ischium subrectangular, anterior margin with round lobe, posterior margin with four robust setae; merus, carpus, and propodus each with lobe covered in palmate setae; merus posterior lobe well developed with seven robust setae; carpus subtriangular; propodus subovate, palm obtuse, laterodistal corner with six robust setae in one line; dactylus slender, not longer than palm.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
E37C7474080E5EAAB81BC594F65D4612.taxon	distribution	Distribution. Thailand. Klong Mai, Bang Pu, Samut Prakan.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
E37C7474080E5EAAB81BC594F65D4612.taxon	etymology	Etymology. Named for the freshwater habitat where the species was collected.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
E620BDBD67E25CBA99F6A0D4BE772DB8.taxon	type_taxon	Type species. Platorchestia platensis (Krøyer, 1845), original designation.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
E620BDBD67E25CBA99F6A0D4BE772DB8.taxon	description	Diagnostic description. (modified from Myers and Lowry 2023) Antenna 1 short, not longer than article 4 of antenna 2 peduncle. Antenna 2 peduncular article 3 without ventral plate; articles 4 and 5 occasionally incrassate in males. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Gnathopod 1 sexually dimorphic; subchelate; posterior margin of carpus and propodus each lobe covered in palmate setae; dactylus cuspidactylate. Gnathopod 2 subchelate in male, mitten-shaped in female; basis narrow or slightly expanded; propodus palm posterodistal corner without protuberance. Pereopods 3 – 7 cuspidactylate. Pereopod 7 occasionally incrassate in male. Uropod 1 outer ramus without marginal robust setae. Telson with apical and marginal robust setae.	en	Suklom, Anotai, Keetapithchayakul, Tosaphol Saetung, Rahim, Azman Abdul, Wongkamhaeng, Koraon (2025): Two new species of riparian hoppers (Amphipoda, Talitridae) from Trat and Samut Prakan provinces, Thailand. ZooKeys 1234: 369-396, DOI: 10.3897/zookeys.1234.140645
