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image of Journal of Crustacean Biology

ABSTRACT Description and illustrations are presented for Sicyonia martini, a new species ranging from SW of Isla Santa Margarita, Baja California Sur, and the Gulf of California southward to SW of Punta Ana Maria, Golfo de Panama. It occurs in depths between 9 and 242 m. Its closest relatives are S. affinis and S. aliaffinis, inhabitants of the American Pacific. Sicyonia martini differs from them in possessing a longer rostrum, which in the males is less elevated and bears 3 instead of 2 teeth; although in the females the rostrum bears 2 teeth, it is usually markedly convex ventrally along the midlength. In both sexes a prominent lateral angular ridge is borne on the terga of the second and third abdominal somites, and the apical part of the tooth on the first abdominal somite is hooklike instead of straight or slightly curved. Furthermore, in males the dorsolateral lobule of the petasma is bifurcate distally with sharp tips, whereas in S. affinis and S. aliaffinis it is truncate or only slightly emarginate.

Affiliations: 1: (IPF) National Marine Fisheries Service, Systematics Laboratory, National Museum of Natural History, Washington, D.C. 20560; 2: (BBB) Georgia Department of Natural Resources, 1200 Glynn Avenue, Brunswick, Georgia 31520.


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