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Two New Species of Astacilla (Isopoda, Arcturidae) From the Catalan Coast of Spain

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Two new species of the valviferan isopod family Arcturidae, Astacilla depressa n. sp. and A. laevis n. sp. are described from the Ebro delta, Catalan coast of Spain. A diagnosis and description of the species are presented, and they are compared with the six other species of the same genus in the Mediterranean, Iberian Peninsula, and north Africa. A. depressa n. sp. is characterized by a dorsal sculpture comprising a pair of low, rounded tubercles on the head; a small dorsal tubercle on both pereonites 2 and 3; a large, broad, dorsal arch-shaped posteriorly-facing truncate tubercle near the anterior margin of pereonite 4, and a smaller, similar tubercle near the posterior margin. A. laevis n. sp. possesses a dorsal sculpture comprising a pair of small, rounded tubercles on the head; 1 small middorsal tubercle on pereonite 2; 1 middorsal broad, low tubercle on pereonite 3; 1 tubercle at one-third the length of pereonite 4 and a second one near the posterior margin of this pereonite.

Affiliations: 1: Departament de Didàctica de les Ciències Experimentals i de la Matemàtica, Universitat de Barcelona, Passeig de la Vall d'Hebron, 171, E-08035 Barcelona, Spain; 2: Department of Crustacea, Museum of Victoria, 71 Victoria Crescent, Abbotsford, Victoria 3067, Australia


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