Globosolembos rimatara, Alan A Myers, 2005

Alan A Myers, 2005, Aoridae (Amphipoda: Corophioidea) from the Austral Isles, Records of the Australian Museum 57, pp. 355-360 : 358-360

Globosolembos rimatara n.sp.

Figs. 3–4

Material examined. HOLOTYPE AM P54523 3. 4.2 mm. Small lagoon near Mutua Ura, Rimatara, Austral Isles, 1.5 m depth, coarse sand, J.K. Lowry & J.M. Poupin, 9 August 1991 . PARATYPES, AM P54523, (233, 1♀), same data as holotype .

Other material. AM P54530 (733, 11♀♀), near edge of lagoon at Rairua , Raivavae, Austral Isles, 1 m, rubble and sand, 14 August 1991, J.K. Lowry ; AM P54533 (1033, 9♀♀, 1 immature) Point Maomao , Ha’urei Bay , Rapa, Austral Isles, 0.5– 2 m depth, rubble and sand, 17 August 1991, J.K.Lowry ; AM P54535 (13) same locality, date and collector, no depth or substrate given .

Description. Male. Head lateral cephalic lobes apically truncate; eyes clear (in alcohol). Head anteroventral margin moderately excavate, moderately recessed. Body with sternal spines on pereon segments 1–5. Antenna 1 and 2 unknown. Mandible palp article 3 10% longer than article 2, weakly falcate, setae of variable lengths. Maxilla 1 inner plate with one long pectinate apical seta. Labium outer plate with long mandibular processes and with both fine and stout distal setae. Maxilliped palp without wing-like flanges. Gnathopod 1 coxa twice as long as broad; propodus one and one half times length of carpus, palm excavate, the excavation broad, shallow and terminating proximally in a subacute spine; dactylus elongate, greatly overlapping palm. Gnathopod 2 basis stout, anterior margin with a few long setae; carpus subequal in length with propodus; carpus and propodus anterior margins densely clothed in long setae; dactylus slender, fitting palm. Pereopod 6 basis with long setae on both anterior and posterior margins. Pereopod 7 unknown. Epimeron 3 rounded. Uropod 1 peduncle about 20% longer than rami, interramal spine about one quarter length of peduncle. Uropod 2 peduncle interramal spine absent; peduncle and rami subequal. Uropod 3 rami subequal; inner ramus subequal with peduncle. Telson with fine setae only.

Female dimorphic characters:. Gnathopod 1 coxa one and one half times as long as broad; propodus palm not excavate, defined by a small obtuse process.

Remarks. In having a deeply excavate palm on the male gnathopod 1, G. rimatara resembles G. excavatus (Myers) (also known from the Austral Isles), G. indicus (Ledoyer) and G. lunatus Myers , but in those species, the excavation does not terminate proximally in a subacute process. In addition, G. excavatus differs from the present species in having mandible palp article 3 long (about 140% length of article 2), male gnathopod 2 propodus elongate, pereopod 6 basis with setae on posterior margin only, uropod 1 interramal spine one third length of peduncle, uropod 3 inner ramus significantly longer than outer and uropod 3 rami one and one half times length of peduncle. Globosolembos rimatara differs from both G. indicus and G. lunatus in the absence of an interramal spine on the peduncle of uropod 2. It also differs from G. indicus in the non-falcate mandible palp article 3, and from G. lunatus in the weakly spinose uropods 1–2 and the non-sinuous palm of the female gnathopod 1.

Habitat. In sand and rubble.

Distribution. Known only from the Austral Isles. Etymology. Named after the type locality.

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Myers, A.A., 1997. Amphipoda from the South Pacific: Western Samoa. Records of the Australian Museum 49(1): 99–109.

Myers, A.A., 1998. The Amphipoda (Crustacea) of New Caledonia: Aoridae . Records of the Australian Museum 50(2): 187–210.

Pirlot, J., 1938. Les amphipodes de l’expédition du Siboga. Deuxième partie: III(2): Dexaminidae-Podoceridae. Siboga Expéditie. Monographie 33f: 329–359.

Manuscript submitted 3 September 2001, revised 21 September 2004 and accepted 2 August 2005.

Associate Editor: G.D.F. Wilson.