Hyalella

Bastos-Pereira, Rafaela & Bueno, Alessandra Angélica De Pádua, 2012, New species and new report of Hyalella S. I. Smith, 1874 (Crustacea: Amphipoda: Dogielinotidae) from Minas Gerais state, Southeastern Brazil, Zootaxa 3350, pp. 58-68 : 68

Key to the species of Hyalella from Brazil

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

- Body with flanges on some pereonites and some pleonites.................................................... 12

2. Eyes absent or reduced................................................................................ 13

- Eyes present and pigmented............................................................................. 3

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

- Uropod 1 of male with curved setae on inner ramus........................................................... 8

4. Gnathopod 2 propodus palm as long as posterior margin....................................................... 5

- Gnathopod 2 propodus palm longer or shorter than posterior margin............................................. 6

5. Peduncle of uropod 3 slightly wider than ramus..................................................... H. longistila

- Peduncle of uropod 3 as long as ramus.............................................................. H. dielaii

6. Gnathopod 2 palm shorter than posterior margin.............................................................. 7

- Gnathopod 2 palm longer than posterior margin...................................................... H. meinerti

7. Telson longer than wide....................................................................... H.warmingi

- Telson as wide as long...................................................................... H. gracilicornis

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

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

9. Gnathopod 1 propodus inner face with a row of until seven setae............................................... 10

- Gnathopod 1 propodus inner face with ten or more pappose setae......................................... H.castroi

10. Telson with two widely apart strong setae..................................................... H. carstica n. sp.

- Telson with more than two strong setae................................................................... 11

11. Gnathopod 2 dactylus shorter than propodus palm.................................................. H.brasiliensis

- Gnathopod 2 dactylus as long as propodus palm.................................................. H. curvispina

12. Flanges present on pleonite 1–3................................................................. H. pleoacuta

- Flanges present on pleonite 1–2.............................................................. H. pseudoazteca

13. Eyes absent.................................................................................... H. caeca

- Eyes reduced................................................................................. H. spelaea