Halearcturus, a new genus of Antarcturidae Poore, 2001 (Crustacea: Isopoda: Valvifera) with a key to genera of the family

Abstract

Poore, G.C.B. 2015. Halearcturus, a new genus of Antarcturidae Poore, 2001 (Crustacea: Isopoda: Valvifera) with a key to genera of the family. Memoirs of Museum Victoria 73: 13–18. A new genus Halearcturus is erected for a single species, Arcturus serrulatus Whitelegge, 1904. It differs from all other antarcturid genera in the combination of having an antennal flagellum of one major article plus a short curved tapering article (all other genera have either three or four articles, or about nine, plus a terminal one) and is unusual in lacking a uropodal exopod. Halearcturus has unique complex ornamentation; it lacks both a strong medial posterior spine and a pair of prominent sublateral spines on the pleotelson, typical of other antarcturids. The genus has a single species from south-eastern Australia. A key to genera of Antarcturidae is presented.