Sea slug night fever: 39 new records of elusive heterobranchs in the western Mediterranean (Mollusca: Gastropoda) Author Salvador, Xavier 0000-0003-3039-7566 Author Fernández-Vilert, Robert 0000-0002-2812-4414 Author Moles, Juan 0000-0003-4511-4055 text Journal of Natural History 2022 2022-05-18 56 5 - 8 265 310 http://dx.doi.org/10.1080/00222933.2022.2040630 journal article 10.1080/00222933.2022.2040630 38f6df24-838f-409a-90df-b56087e6a9bc 1464-5262 6758438 Pneumodermopsis canephora Pruvot-Fol, 1924 ( Figure 5 (d)) Material examined Montiel , Tamariu ( Spain ), 41°54 ʹ 55.9”N , 3°12 ʹ 46.3”E , 13 February 2019 , 1 m depth , 9 spcs, adults, L = 7–10 mm ; Montiel, Tamariu ( Spain ), 41°54 ʹ 55.9”N , 3°12 ʹ 46.3”E , 12 March 2021 , 3 m depth , 1 spc., adult, L = 5 mm ; Cala Sa Tuna , 41°57 ʹ 38”N , 3°13 ʹ 52”E , 31 March 2021 , 1 m depth , 2 spcs, juvenile and adult, L = 2–10 mm . External morphology Body rounded, transparent, with numerous glands, dark chromatophores can be seen by transparency all over body. Lateral gill extremely long, posterior gill absent. Posterior end with two ciliated bands. Head with two apical tentacles. Ecology Found in open waters close to the surface and with other pteropods and pelagic salps. Distribution North Atlantic ( OBIS 2021 ); Mediterranean Sea ( Pruvot-Fol 1924 ); this is the first report of this gastropod from the Catalan coast ( Spain ). Remarks Mostly found in North Atlantic waters ( Pruvot-Fol 1924 ) . Of the eight specimens collected and housed alive in the same container, two disappeared along with some other species of pteropods, likely indicating that in stressful situations this species may be cannibalistic. Order RUNCINIDA Family RUNCINIDEA H. Adams and A. Adams, 1854 Genus Runcina Forbes [in Forbes and Hanley], 1851