Hyalella

Rodrigues, Stella Gomes, Bueno, Alessandra Angélica De Pádua & Ferreira, Rodrigo Lopes, 2014, A new troglobiotic species of Hyalella (Crustacea, Amphipoda, Hyalellidae) with a taxonomic key for the Brazilian species, Zootaxa 3815 (2), pp. 200-214 : 211-212

Key to the species of Hyalella from Brazil

1 Body surface smooth.................................................................................. 2

– Body with flanges on some peraeonites and some pleonites.................................................. 14

2 Eyes absent or reduced............................................................................... 16

– Eyes present and pigmented............................................................................ 3

3 Uropod 1 of male without curved seta on inner ramus....................................................... 4

– Uropod 1 of male with curved seta on inner ramus.......................................................... 9

4 Dorsal margin of uropod 3 without setae.................................................................. 5

– Dorsal margin of uropod 3 with setae.............................................................. H. dielaii

5 Gnathopod 2 with propodus much less than twice its width................................................... 6

– Gnathopod 2 with propodus almost twice its width................................................. H. longistila

6 Slender setae on apical margin of telson.................................................................. 7

– Strong setae on apical margin of telson........................................................... H. meinerti

7 Inner face of gnathopod 1 with a row of five or less serrate setae............................................... 8

– Inner face of gnathopod 1 with a row of 10 or more serrate setae...................................... H. warmingi

8 Flagellum of antenna 2 with 14–17 articles........................................................ H. minensis

– Flagellum of antenna 2 with 19–25 articles..................................................... H. gracilicornis

9 Sternal gills present on segments 2–7................................................................... 10

– Sternal gills present on segments 3–7....................................................... H. montenegrinae

10 Telson with more than two apical setae.................................................................. 11

– Telson with only two strong apical setae.......................................................... H. carstica

11 Gnathopod 2 dactylus shorter than propodus palm......................................................... 12

– Gnathopod 2 dactylus as long as propodus palm........................................................... 13

12 Rami of uropod 3 with only cuspidate setae distally................................................. H. xakriaba

– Rami of uropod 3 with cuspidate and simple setae distally.......................................... H. brasiliensis

13 Peduncle of uropod 3 with four to six cuspidate apical setae........................................ H. curvispina

– Peduncle of uropod 3 with more than seven cuspidate apical setae....................................... H. castroi

14 Uropod 1 of male with curved seta on inner ramus......................................................... 15

– Uropod 1 of male without curved seta on inner ramus........................................... H. pseudoazteca

15 Flanges present only on pleonite 1–2............................................................ H. kaingang

– Flanges present on peraeonite 7 and pleonite 1–3.................................................. H. pleoacuta

16 Sternal gills present on segments 3–7................................................................... 17

– Sternal gills present on segments 2–7............................................................. H. spelaea

17 Antenna 1 longer than antenna 2....................................................................... 18

– Antenna 1 shorter than antenna 2.................................................................. H. caeca

18 Posterior lobe of carpus with a row of serrate setae.................................................... H. imbya

– Posterior lobe of carpus with a row of simple setae........................................... H. epikarstica n. sp.