Haploniscus rostratus

Brökeland, Wiebke, 2010, Redescription of Haploniscus rostratus (Menzies, 1962) (Crustacea: Peracarida: Isopoda) with observations on the postmarsupial development, size ranges and distribution, Zootaxa 2521, pp. 1-25 : 21-22

Key to the ontogenetic stages of Haploniscus rostratus

1 Pereopod 7 present........................................................................................................................................................ 3

- Pereopod 7 absent ....................................................................................................................................................... 2

2 Pleotelson processes not reaching distal tip of large uropods .......................................................................... manca I

- Pleotelson processes extending beyond uropods ............................................................................................. manca II

3 Pereopod 7 fully developed, about as long as pereopod 6 .......................................................................................... 4

- Pereopod 7 shorter than pereopod 6, without setae or unguis ........................................................................ manca III

4 Pleopod 1 present......................................................................................................................................................... 5

- Pleopod 1 absent .......................................................................................................................................................... 7

5 Pleopod 1 extending beyond posterior margin of branchial chamber, pleopods 2 separated....................................... 6

- Pleopod 1 not reaching posterior margin of branchial chamber, both pleopods 2 fused................................. male IV

6 Pleopod 1 lateral processes not separated, pleopod 2 endopod short, extending only slightly beyond exopod............. ........................................................................................................................................................................... male V

- Pleopod 1 distal part ornamented with separated lateral processes, pleopod 2 endopod longer, extending almost to distal margin of protopod .................................................................................................................................. male VI

7 Antenna 1 with four flagellar articles .......................................................................................................................... 8

- Antenna 1 with three flagellar articles........................................................................................................... female IV

8 Without marsupium ......................................................................................................................................... female V

- With marsupium.............................................................................................................................................. female VI