Brevitalitrus, Bousfield, 1971

Tomikawa, Ko, Nakano, Takafumi, Ross Othman, B. H. & Morino, Hiroshi, 2018, A New Species of Brevitalitrus (Crustacea: Amphipoda: Talitridae) from Malaysia, Species Diversity 23 (1), pp. 51-59 : 58-59

Key to Species of Brevitalitrus

1 Outer rami of uropods 1 and 2 with marginal robust setae......................................... 2

— Outer rami of uropods 1 and 2 without marginal robust setae.................................... 6

2 Posterodistal corners of epimeral plates 1–3 with prominent rounded tooth; telson with dorso-lateral marginal robust setae............... B. stephenseni

— Posterodistal corners of epimeral plates 1–3 sub-acute and slightly produced; telson without dorso-lateral marginal robust setae.......................... 3

3 Inner distal corner of pleopod 2 with seta......... 4

— Inner distal corner of pleopod 2 without seta...... 5

4 Inner ramus of uropod 1 with 3 marginal robust setae........................................ B. wolffi

— Inner ramus of uropod 1 with 5 marginal robust setae................................... B. hortulanus

5 Outer margin of inner ramus of uropod 2 with 1 robust seta; inner rami of pleopods 1 and 2 relatively long and 0.7–0.9 times as long as peduncles; robust seta on peduncle of uropod 3 reaching distal part of ramus....................................... B. pangkorensis

— Outer margin of inner ramus of uropod 2 with 2 robust setae; inner rami of pleopods 1 and 2 short and 0.5 times as long as peduncles; robust seta on peduncle of uropod 3 not reaching distal part of ramus................................................ B. strinatii

6 Distal lobe of basis of pereopod 7 rounded below; rami of pleopods 1 and 2 7- to 9-articulate, longer than respective peduncles......................... B. toli

— Distal lobe of basis of pereopod 7 emarginate; rami of pleopods 1 and 2 2- to 6-articulate, shorter than respective peduncles............................. 7

7 Antenna 2 long, flagellum 25- to 28-articulate; ramus of uropod 3 with 1 seta................ B. dyaulanus

— Antenna 2 short, flagellum 12- to 16-articulate; ramus of uropod 3 with 2–3 setae...................... 8

8 Posterodistal lobe of basis of pereopod 7 distinctly incised at junction with ischium; posterior margin of epimeral plate 3 sinuous; distolateral robust seta of uropod 1 having a projecting terminal capillary and a terminal cap............................. B. nesius

— Posterodistal lobe of basis of pereopod 7 barely incised at junction with ischium; posterior margin of epimeral plate 3 gently convex; distolateral robust seta of uropod 1 simple............................. B. kumanoi