Piseinotecus soussi Tamsouri, Carmona, Moukrim and Cervera, 2014

Salvador, Xavier, Fernández-Vilert, Robert & Moles, Juan, 2022, Sea slug night fever: 39 new records of elusive heterobranchs in the western Mediterranean (Mollusca: Gastropoda), Journal of Natural History 56 (5 - 8), pp. 265-310 : 286

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https://doi.org/ 10.1080/00222933.2022.2040630



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Piseinotecus soussi Tamsouri, Carmona, Moukrim and Cervera, 2014


Piseinotecus soussi Tamsouri, Carmona, Moukrim and Cervera, 2014 View in CoL View at ENA

( Figure 4 View Figure 4 (e))

Material examined

Cala Maset caves, Sant Feliu de Guíxols ( Spain), 41°47 ʹ 10”N, 3°2 ʹ 44”E, 22 January 2018, 1.8 m depth, 7 spcs, juveniles, adults and egg masses, L = 4–25 mm; 29 January 2018, 1.6 m depth, 9 spcs, adults and egg masses, L = 12–25 mm GoogleMaps .

External morphology

Body elongate, narrow, background colour violet or pink. Rhinophores and oral tentacles smooth, white apically with degraded white punctuation. Cerata smooth, long, translucent, with digestive gland visible in orange; white apically, presenting profuse white punctuation.


Specimens found mating and laying the egg masses on unidentified species of hydrozoans at night, and inactive at the base of the colonies during the day.


Morocco ( Tamsouri et al. 2014); Italy (Ballesteros et al. 2012–2021), Catalonia ( Ballesteros et al. 2016; this study).


Originally described from Morocco, it is quite widespread on the Catalan coast. Differs from similar-looking species, such as Edmundsella pedata (Montagu, 1816) , by the presence of abundant white spots in the cerata, rhinophores and oral tentacles.