A revision of the North Atlantic amphipod genus Normanion (Crustacea: Amphipoda: Lysianassoidea) Author Kilgallen, Niamh M. Author Myers, Alan A. Author Grath, David M text Zootaxa 2006 1363 1 21 journal article 10.5281/zenodo.174732 7d1027fd-2557-46f2-8edd-5a0ddc720d55 1175-5326 174732 Key to the genus Normanion 1. Maxilliped palp 4-articulate, article 4 rudimentary; palp reaching well beyond tip of inner plate. Gnathopod 1 propodus broader than long .................................................. 2 - Maxilliped palp 3-articulate, reaching only to tip of inner plate. Gnathopod 1 propodus subequal in length and breadth, or slightly longer than broad ...................................... 3 2. Eyes present ................................................................................................. N. amblyops - Eyes absent ....................................................................................................... N. abyssi 3. Gnathopod 1 propodus palm smooth and striated, not denticulate ............................... 4 - Gnathopod 1 propodus palm distinctly denticulate ..................................... N. chevreuxi 4. Uropod 3 rami subequal. Telson entire ............................................................. N. ruffoi - Uropod 3 rami distinctly unequal. Telson slightly emarginate ............. N. quadrimanus