Abstract
Ampelisca armoricana n. sp. is described from the Bay of Morlaix, northern Brittany, France. The population (in the summer more than 30.000 individuals per m 2 ) has been destroyed by the hydrocarbon pollution from the wreck of the Amoco Cadiz. The new species is characterized (1) by its short antennae: the first antenna reaches beyond the peduncle of the second, the second is about 1/3 as long as the body; (2) the presence on the first urosome segment of a shallow rounded carina; (3) the presence of a small tooth at the posteroinferior corner of the second epimeral plate; (4) the sinuous posterior margin of the third epimeral plate; (5) the presence of marginal spines on the first and second uropods. The species is compared to its nearest relatives.
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