Floresorchestia Bousfield, 1984

Floresorchestia Bousfield, 1984 View in CoL

Orchestia floresiana View in CoL group: Bousfield 1971: 267.

Floresorchestia Bousfield, 1984: 205. Miyamoto and Morino 2008: 838. Lowry and Springthorpe 2009: 121. Lowry and Springthorpe 2015: 7. View in CoL

Type species.

Orchestia floresiana Weber, 1892 , original designation.

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.

Species composition.

Floresorchestia includes 29 species: F. amphawaensis Suklom, Keetapithchayakul, Abdul Rahim & Wongkamhaeng, 2022 ; F. andrevo Lowry & Springthorpe, 2015 ; F. anomala (Chevreux, 1901) ; F. anoquesana ( Bousfield, 1971) ; F. anpingensis Miyamoto & Morino, 2008 ; F. boonyanusithii Wongkamhaeng, Dumrongrojwattana & Pattaratumrong, 2016 ; F. buraphana Wongkamhaeng, Dumrongrojwattana & Pattaratumrong, 2016 ; F. floresiana ( Weber, 1892) ; F. hanoiensis Hou & Li, 2003 ; F. kalili Lowry & Springthorpe, 2015 ; F. kongsemae Suklom, Danaisawadi & Wongkamhaeng, 2021 ; F. laurenae Lowry & Springthorpe, 2015 ; F. malayensis (Tattersall, 1922) ; F. mkomani Bichang’a & Hou in Bichang’A et al., 2021; F. odishi Bhoi, Myers, Kumar & Patro, 2024 ; F. oluanpi Lowry & Springthorpe, 2015 ; F. palau Lowry & Myers, 2013 ; F. papeari Lowry & Springthorpe, 2015 ; F. pohnpei Lowry & Myers, 2013 ; F. poorei Lowry & Springthorpe, 2009 ; F. pongrati Suklom, Keetapithchayakul, Abdul Rahim & Wongkamhaeng, 2022 ; F. samoana ( Bousfield, 1971) ; F. seringat Lowry & Springthorpe, 2015 ; F. thienemanni (Schellenberg, 1931) ; F. trisetosa sp. nov.; F. vitilevana (J. L. Barnard, 1960) ; F. xueli Tong, Hao, Liu, Li & Hou, 2021 ; F. yap Lowry & Springthorpe, 2015 ; F. yehyuensis Miyamoto & Morino, 2008 .

Remarks.

The subfamily Floresorchestiinae is comprised of three genera ( Austropacifica , Floresorchestia , and Gazia ) and is defined by vertical slits on the ventral margin of epimera 1–3, 2 and 3, or only 2. Floresorchestia differs from Gazia in having a palmate lobe on the merus carpus and propodus of male gnathopod 1, whereas Gazia lacks a palmate lobe on the merus of male gnathopod 1. Floresorchestia differs from Austropacifica in not having the mid-medial robust setae with a modified tip on the outer ramus of uropod 1.