Sea slug night fever: 39 new records of elusive heterobranchs in the western Mediterranean (Mollusca: Gastropoda) Salvador, Xavier Fernández-Vilert, Robert Moles, Juan Journal of Natural History 2022 2022-05-18 56 5 - 8 265 310 4G6BQ (Montagu, 1803) Montagu 1803 [432,804,1234,1259] Gastropoda Philinidae Philine Animalia Cephalaspidea 5 270 Mollusca species catena  ( Figure 2(d))   Material examined   Cala Masetcaves, Sant Feliu de Guíxols( Spain), 41°47 ʹ10”N, 3°2 ʹ44”E,  13 December 2017,  1.3 mdepth, 1 spc., adults, L = 5 mm;  Punta del Romaní, L’Escala( Spain), 42°6 ʹ54”N, 3°10 ʹ9”E,  30 December 2017,  2.5 mdepth, 2 spcs, adults, L = 3–7 mm; Cala d’Aiguafreda, Begur ( Spain), 41°57 ʹ49”N, 3°13 ʹ41”E,  31 January 2018,  1.2 mdepth, 1 spc., adult, L = 5 mm.   External morphology Body elongate, narrow, white-beige or brown, with a discontinuous dark brown band over cephalic shield. Cephalic shield longer than shell. Parapodia short, not overlapping. Shell completely covered by mantle. Individuals likely hide in the sediment during the day and are active at night.   Ecology Specimens were found crawling at night on rocks with algae and sediment between rocky outcrops.   Distribution North Sea (GBIF.org 2021); Azores( Cervera et al. 2004); Portugal( Cervera et al. 2004); Italyand Croatia( Zenetos et al. 2016); Greece( Crocetta et al. 2015); Atlantic Spanish coast: Galicia and Cantabria ( Cervera et al. 2004); Mediterranean Spanish coast: Catalonia (this study).   Remarks Molecular and morphological data indicate that this species may not belong to the genus  Philine(J. Moles unpubl. data). 3819588348 2017-12-13 2018-01-31 2017-12-30 Spain 1 41.78611 Cala Maset 19 3.0455556 Sant Feliu de Guixols 5 270 1 3819588339 2017-12-30 2018-01-31 2017-12-30 Spain 3 41.96361 Punta del Romani 19 3.2280555 L'Escala 5 270 1 3819588381 2017-12-30 2018-01-31 2017-12-30 Spain 3 41.96361 Punta del Romani 19 3.2280555 L'Escala 5 270 1