Eurydice

Jones, David Alan & Nithyanandan, Manickam, 2012, Taxonomy and distribution of the genus Eurydice Leach, 1815 (Crustacea, Isopoda, Cirolanidae) from the Arabian region, including three new species, Zootaxa 3314, pp. 45-57 : 47

Key to species of Eurydice from the Arabian region

1. Uropod endopod twice or almost twice (1.8–2.3) width of exopod and exceeding length of exopod by up to 1.25 times; posterior margin of pleotelson with 2 or 4 robust setae........................................................ 2

- Uropod endopod less than twice (1.5–1.7) width of exopod and exceeding length of exopod by over 1.4 times; posterior margin of pleotelson without robust setae at most simple or plumose setae............................................... 5

2. Antennal flagellum reaching at least to pereonite 5, antennal peduncle article 3 with 6–17 setae; posterior margin of pleotelson with 4 robust setae.................................................................................... 3

- Antennal flagellum reaching only to mid-length of pereonite 1; antennal peduncle article 3 with 5 setae; posterior margin of pleotelson with 2 robust setae.............................................................. Eurydice paxilli

3. Antennal flagellum not reaching beyond pereon; antennal peduncle article 3 with 6–9 setae; posterior margin of pleotelson with 4 robust setae..................................................................................... 4

- Antennal flagellum reaching beyond second pleonite; antennal peduncle article 3 with 17 setae; posterior margin of pleotelson narrow with 4 robust and 8 simple setae............................ Eurydice indicis ( India not Arabian region as yet)

4. Antennal flagellum reaching to mid seventh pereonite; posterior margin of pleotelson one third of pleotelson width with 4 robust setae and circa 15 plumose setae................................. Eurydice peraticis ( India and Arabian Gulf)

- Antennal flagellum reaching fifth pereonite; antennal peduncle article 3 with 6 setae; posterior margin of pleotelson one fifth of width of pleotelson width with 4 robust setae and 6 plumose setae........... Eurydice arabica (Red Sea–Arabian Gulf)

5. Antennal flagellum reaching mid pleon or beyond; peduncle article 3 with 5 setae; pleotelson posterior margin truncate without robust setae but with 6 plumose and 2 simple seta; tip of appendix masculina pointed............................... 6

- Antennal flagellum reaching end of pereon; pedunclular article 3 with 3 setae; pleotelson posterior margin slightly rounded without robust setae but with 6 plumose and 8 simple setae; tip of appendix masculina blunt........................................................................................... Eurydice marzouqui sp. nov. (Arabian Gulf)

6. Antennal flagellum reaching pleonite 2, antennule flagellum reaching pereonite 1; hind margins of pleonites serrated; pleotelson posterior margin with 5 equal apical teeth; appendix masculina with lateral terminal point........................................................................................ Eurydice marisrubri sp. nov. (Red Sea)

- Antennal flagellum reaching beyond mid pleotelson, antennule flagellum reaching pereonite 3, hind margins of pleonites smooth; pleotelson posterior margin with 7 apical teeth, central 3 pronounced; appendix masculina with terminal point straight...................................................................... Eurydice tridentata sp. nov. (Red Sea)