A new bathyal mysid of the family Petalophthalmidae (Crustacea: Mysida) from the Bismarck Sea (Western Tropical Pacific Ocean) Author Vicente, Carlos San Author Corbari, Laure text Zootaxa 2015 3925 2 241 256 journal article 10.11646/zootaxa.3925.2.6 76265034-a1ec-4fba-8654-84a9971e30d6 1175-5326 240618 0B30725F-0EA2-4B30-A11C-FBFC6A93F735 Key to species of Petalophthalmus Willemoës-Suhm, 1875 An identification key (modified from Panampunnayil 1982 , Wang 1998 , San Vicente et al. 2014 ) is proposed to include the new species herein described. 1. Eyes flattened and leaf-like, without eyestalks and without functional visual elements............................... 2 - Eyes not flattened, with cornea more or less globular in shape, with eyestalks and functional visual elements............. 3 2. Eyes with ocular papilla near the middle inner dorsal margin........ P. papilloculatus San Vicente , Frutos and Cartes, 2014 - Eyes without ocular papilla.................................................. P. armiger Willemoës-Suhm, 1875 3. Eye cornea globular, eyestalk shorter than the cornea, cornea with ocular papilla. Telson apex without pappose setae.......................................................................................... P. papuaensis sp.nov. - Eye cornea hemispherical or reniform, eyestalk subequal or slightly longer than the cornea, cornea without ocular papilla. Tel- son apex with pappose setae............................................................................ 4 4. Eyestalk with ocular papilla near the middle inner dorsal margin............................... P. oculatus Illig, 1906 - Eyestalk without ocular papilla........................................................................... 5 5. Eye cornea hemispherical; telson apex emarginated in the median region and lateral margins with 12–15 setae increasing in length backwards.............................................................. P. caribbeanus Tattersall, 1968 - Eye cornea reniform. Telson apex not emarginated in the median region; lateral margins with more than 15 subequal setae.. 6 6. Apex of rostral plate slightly pointed. Eyestalk subequal in length to cornea. Telson apex armed with three serrate setae.................................................................... P. macrops Tchindonova and Vereshchaka, 1991 - Apex of rostral plate blunt. Eyestalk longer than cornea. Telson apex armed with seven serrate setae..... P. liui Wang, 1998