Trivia arctica (Pulteney, 1799)
Northern Norway to W. Mediterranean.
Predator on sessile preys (mostly Ascidians) in the upper infralittoral. Mediterranean specimens are said to bear less ribs than atlantic ones. – Shallow water among rocks along the jetty, Cassis, Provence, S. France. 10mm.
Synonyms: anglica, europaea, hispania, norvegica… and also mollerati for mediterranean specimens. Under subtidal rock, Spernec Point, Groix Island, S. Brittany, NW. France. 8mm.
On muddy sands, near rocks, at extreme low tide, north of Saint-Céran harbour, Baie de la Fresnaye, Côtes d’Armor, N. Brittany. 12mm.
In crevices on rocks at extreme low tide, zone of red algae (Sphaerococcus coronopifolius Stackhouse), Petit Bey islet, Saint-Malo, N. Brittany. 9-11mm.
Egg-laying near Zierikzee, south coast of Schouwen-Duiveland island, Zeeland, SW. Netherlands. Original picture provided by V_S_ for iNaturalist – (CC BY-NC).
A specimen observed by night near Saint-Suliac, Rance Basin, N. Brittany. Original picture provided by P. Corbrion for iNaturalist – (CC BY-NC-SA).

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