Thecacera pennigera,also known as the winged thecacera, is a species ofsea slugin the familyPolyceridae.It has acosmopolitan distribution,being found in temperate waters on either side of the NorthAtlantic Ocean,in theMediterranean Sea,around South and West Africa, Brazil, Japan, Korea, Pakistan and more recently in Australia and New Zealand. There is a significant difference in colouring between Atlantic populations and Pacific specimens, however.Thecacera pennigerahas a typical adult length between 15 millimetres (0.6 in) and 30 millimetres (1.2 in), featuring a short, wide head with two lateral flaps and two sheathed olfactory organs calledrhinophores.The body is wedge shaped, being wide at the front and ending in a slender foot with a lateral keel on either side. The general colour of the body is translucent white and the upper side is covered with orange splotches and small black spots. Like other sea slugs,T. pennigerais ahermaphroditewith internal fertilisation and a mating mechanism whereby pairs of animals exchange packets of sperm. ThisT. pennigerawas photographed in the Mar Piccolo ofTaranto,Italy.
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