Unixenus, Jones, 1944

Huynh, Cuong, 2020, Three new species of penicillate millipedes from the Con Dao Islands of southeast Vietnam (Diplopoda, Lophoproctidae and Polyxenidae), Zootaxa 4759 (1), pp. 1-30 : 25

Key to described species of Unixenus

(This key was adapted from Short and Huynh (2013). The type species from India, U. padmanabhai , is not included due to insufficient detail in the published record)

1. Setae without projecting spines on legs.................................................................... 2

- Setae with projecting spines on legs...................................................................... 6

2. One seta only on femur, no setae on tibia of legs 6–13........................................................ 3

- At least 2 setae on femur, 1 seta on tibia................................................................... 5

3. 3 bacilliform sensilla on antennomere V................................................................... 4

- 4 bacilliform sensilla on antennomere VI......................................................... U. myallensis

4. Telotarsus with more than 2 processes on claw....................................................... U. attemsi

- Telotarsus with 2 or less processes on claw...................................................... U. broelemanni

5. No seta on tarsus 1 of legs 3–13, setiform sensillum between bacilliform sensilla 1 and 2 on antennomere VI..................................................................................................... U. corringlensis

- Seta present on tarsus 1 of legs 3–13, no setiform sensillum between bacilliform sensilla 1 and 2 on antennomere VI............................................................................................ U. carnarvonensis

6. One seta only on femur, no setae on tibia................................................................... 7

- At least 2 setae on femur, 1 seta on tibia................................................................... 8

7. 4 bacilliform sensilla on antennomere VI, 5 ornamental trichomes c .................................... U. corticolus

- 3 bacilliform sensilla on antennomere VI, 3 ornamental trichomes c................................... U. vuillaumei

8. 3 bacilliform sensilla on antennomere VI................................................................... 9

- 4 bacilliform sensilla on antennomere VI....................................................... U. barrabaensis

9. 3 ornamental trichomes c per side, 2 pairs coxal glands...................................................... 10

- 5–9 ornamental trichomes c, 6 pairs coxal glands in male........................................... U. karajinensis

10. Telotarsus with robust claw.................................................................... U. mjoebergi

- Telotarsus with slender claw............................................................................ 11

11. Posterior process longer than half the claw................................................... U. intragramineus

- Posterior process shorter than half the claw.................................................. U. moniqueae n. sp.