Godiva quadricolor (Barnard, 1927) (Figure 4 (d)) Material examined Cala Maset caves, Sant Feliu de Guíxols (Spain), 41°47 ʹ 10.5”N, 3°2 ʹ 44.6”E, 31 December 2017, 2 m depth, 1 spc., L = 10 mm; 5 January 2018, 1.3 m depth, 1 spc., adult, L = 25 mm; 22 January 2018, 1.3 m depth, 1 spc., adult, L = 25 mm; 29 January 2018, 1.3 m depth, 1 spc., adult, L = 25 mm; Le Ponton, Étang de Thau, Sète (France), 43°25 ʹ 28.5”N, 3°42 ʹ E, 8 April 2017, 1 m depth, 5 spc., adults and egg masses, L = 20–40 mm; 20 May 2018, 1 m depth, 4 spc., juveniles, adults and egg masses, L = 5–30 mm. External morphology Body elongate, narrow, background colour light orange with whitish-blue electric marks. Oral tentacles present a whitish blue line connecting apical part with base of rhinophores. Rhinophores conical, slightly annulated, whitish-yellow apically. Cerata abundant, smooth, base red, tops orange, blue and yellow. Ecology This species has a very broad diet (Betti et al. 2015), and is commonly found eating anemones (e.g. the genera Anemonia and Aiptasia), worms (e.g. Sabella), and other heterobranchs such as Spurilla neapolitana (Delle Chiaje, 1841). Distribution This is an invasive species originally from South Africa and the Pacific Sea [e.g. Australia (Nimbs and Smith 2017), Hawaii (Gosliner 1980), now found in Italy, France, the Mediterranean Spanish coast: Andalucía (Zenetos et al. 2016; Gerovasileiou et al. 2017) and Catalonia (this study). Remarks This species is a large facelinid with a very characteristic colour pattern, making it difficult to misidentify. In the Étang de Thau, France, the species is very abundant during spring.] Family PISEINOTECIDAE Edmunds, 1970 Genus Piseinotecus Er. Marcus, 1955

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 285, DOI: 10.1080/00222933.2022.2040630, http://zenodo.org/record/6758438