Leptostracans (Crustacea: Phyllocarida) from mud volcanoes at the Gulf of Cadiz (NE Atlantic) with description of a new species of Sarsinebalia Dahl, 1985

Three leptostracan species (Crustacea: Phyllocarida) are reported from mud volcanoes at the Moroccan margin of Gulf Cadiz (NE Atlantic). Nebalia strausi Risso, 1826 and N. abyssicola Fage, 1929 were found in experimentally deployed organic substrates Mercator, Meknès Darwin volcanoes; was also among bathymodiolin bivalves is recorded for first time Atlantic Ocean. The third collected Gemini described herein as Sarsinebalia ledoyeri sp. nov. new characterised by having eyes provided with ommatidia lacking pigment, ventral eye concave along distal half, antennular scale more than twice long wide, second article mandibular palp bears one seta on lateral surface about 0.5 times subterminal longer article, maxilla II endopod 1.8 proximal exopod clearly pleopod I lacks setae posterodorsal border pleonites VI–VII rounded to pointed denticles.