A new species of Medicorophium Bousfield, M. longisetosum n. sp. from the western Mediterranean, coast of Spain Author Myers, Alan A. Author De-La-Ossa-Carretero, Jose Antonio Author Dauvin, Jean-Claude text Zootaxa 2010 2450 53 60 journal article 10.5281/zenodo.195185 225c2249-283e-4c52-942a-894f7bc75360 1175-5326 195185 Key to the Corophiini of the Mediterranean coast of Spain 1. Urosome segments coalesced ....................................................................................................................................... 2 - Urosome segments free................................................................................................................................................. 8 2. Uropods inserted in notches in lateral margins of urosome.......................................................................................... 3 - Uropods inserted in ventral surface of urosome ......................................................................... Apocorophium acutum 3. Antenna 2 article 4 with large terminal spine or spines (males)................................................................................... 4 - Antenna 2 article 4 with robust setae, but lacking spines (females)............................................................................. 6 4. Rostrum elongate, 1/3 length of antenna 1 article 1 ......................................................... Monocorophium insidiosum - Rostrum short, less than 1/3 length of antenna 1 article 1............................................................................................ 5 5. Antenna 2 article 4 without robust setae........................................................................ Monocorophium acherusicum - Antenna 2 article 4 with 2–3 robust setae.............................................................................. Monocorophium sextonae 6. Antenna 2 article 4 with solitary robust setae only................................................................ Monocorophium sextonae - Antenna 2 article 4 with some paired robust setae ....................................................................................................... 7 7. Antenna 2 article 5 with two or more robust setae ........................................................ Monocorophium acherusicum - Antenna 2 article 5 with one robust seta only................................................................... Monocorophium insidiosum 8. Uropod 3 ramus short, spatulate ................................................................................................... Corophium orientale – Uropod 3 ramus elongate, parallel-sided ............................................................................................. ……………….9 9. Antenna 2 peduncular article 4 with an array of long robust setae................................ Medicorophium longistetosum – Antenna 2 peduncular article 4 with a few short robust setae, or no robust setae ..................................................... 10 10. Rostrum triangular .............................................................................................................. Medicorophium runcicorne – Rostrum truncate ................................................................................................................. Medicorophium annulatum