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

Published as part of Salvador, Xavier, Fernández-Vilert, Robert & Moles, Juan, 2022, Sea slug night fever: 39 new records of elusive heterobranchs in the western Mediterranean (Mollusca: Gastropoda), pp. 265-310 in Journal of Natural History 56 (5 - 8) on page 292, DOI: 10.1080/00222933.2022.2040630, http://zenodo.org/record/6758438