Amakusanthura cosmoledo, Kensley & Schotte, 2000

Kensley, B. & Schotte, M., 2000, New species and records of anthuridean isopod crustaceans from the Indian Ocean, Journal of Natural History 34, pp. 2057-2121 : 2062-2065

Amakusanthura cosmoledo sp. nov.

(Figures 3, 4)

Type material. HOLOTYPE: USNM 253185 , non-ovigerous m 7.5 mm, sta K-AL-110, coarse sand and rubble from reef slope, Cosmoledo Is., 3±5 m, 26 March 1986 . PARATYPES: USNM 253186 , four non-ovigerous m 4.8±5.5 mm, four juveniles, sta K-AL-110, same data as holotype . USNM 253187 , one l 5.5 mm, eight nonovigerous m 4.8±6.0 mm, sta K-AL-101, coral rubble and algal turf from edge of channel Passe Hoareau, Malabar Is., Aldabra, 1 m, 18 March 1986 . USNM 253188 , three non-ovigerous m 4.5±4.8 mm, nine juveniles, sta K-AL-124, coral rubble from reef slope oOE Picard Is., Aldabra, 22 m, 13 April 1987 . USNM 253189 , one m 5.0 mm, one pre- l5.0 mm, ®ve non-ovigerou s m 5.0± 5.7 mm, eight juveniles, sta F8-87, intertidal coral rubble from Passe Hoareau, Malabar Is., Aldabra, 11 April 1987 .

Other material examined. USNM 253190 , one non-ovigerous m, 3 juveniles, sta K-AL-85, coarse sediment and rubble, Anse Var, Picard Is., Aldabra, 10±12 m, 26 March 1985. One non-ovigerous m, K-AL-87, coarse coral rubble, outer reef slope oOE Picard Is., Aldabra, 15 m, 12 March 1986. One juvenile, sta K-AL-106, coralline algal turf, lagoon near Passe du Bois, Aldabra, 0.2 m, 21 March 1986. One non-ovigerous m, two juveniles, sta K-AL-107, coral rubble between patch reefs, Grande Passe, Aldabra, 5±8 m, 21 March 1986. Two juveniles, sta K-AL-108, coarse sand on outer reef slope, Picard Is., Aldabra, 3±5 m, 22 March 1986. One nonovigerous m, nine juveniles, sta K-AL-115, coarse coral rubble in lagoonal patch reefs, Grande Passe, Aldabra, 2±3 m, 6 March 1987. One non-ovigerous m, four juveniles, sta K-AL-117, coarse rubble, outer reef slope, Picard Is., Aldabra, 12±18 m, FIG. 3. Amakusanthura cosmoledo sp. nov.: (A) lanterior segments in lateral view; (B) pleon lateral view; (C) pleon dorsal view; (D) mandible; (E) pleotelson; (F) pleopod 1; (G) maxilliped; (H) uropodal protopod and endopod; (I) uropodal exopod; (J) l

pleopod 2.

7 April 1987. Two non-ovigerous m, two juveniles, sta K-AL-118, coral rubble, outer reef slope, Picard Is., 12 m, 7 April 1987. Two non-ovigerous m, sta K-AL-119, intertidal coralline algal turf, Passe Hoareau, Aldabra, 12 April 1987. Two nonovigerous m, sta F-7-85, coarse intertidal rubble from reef crest, Picard Is., Aldabra,

FIG. 4. Amakusanthura cosmoledo sp. nov.: (A) m pereopod 1; (B) lpereopod 1; (C) pereopod 7; (D) pereopod 2; (E) pereopod 3.

18 March 1985. One non-ovigerous m, sta F-1-87, intertidal reefcrest rubble, Picard Is., Aldabra , 27 March 1987. One pre-, l two non-ovigerous m, sta F-4-87, intertidal rubble, Picard Is., Aldabra , 3 April 1987. Three non-ovigerous m, three juveniles, sta F-7-87, coral rubble from patch reefs, Grande Passe, Aldabra, 2 m , 6 April 1987. Two non-ovigerous m, four juveniles, sta F-11-87, coral rubble, reef crest, Picard Is., Aldabra, 0.3 m , 13 April 1987.

Diagnosis. Non-ovigerous female: Pleotelson ovate, widest at about midlength, posterior margin notched, bearing cluster of three pairs of setae, dorsal surface of posterior half bearing about 12±15 scattered elongate simple setae at right angles to surface. Lamina dentata of mandible having four marginal serrations; palp with article 2 longer than 1, article 3 short, with two distal setae. Maxillipedal endite reaching to suture between articles 2 and 3 of palp, with single terminal seta. Pereopod 1, carpus triangular, posterodistally acute; propodus palm with blunt process, with few scattered setae on mesial face; unguis about as long as remainder of dactylus, with short squat accessory seta at base. Pereopods 2 and 3, carpus posterodistally rounded, lacking free anterior margin; propodus with strong serrate setae at posterodistal angle. Pereopod 7, carpus with short free anterior margin, with short rigid seta posterodistally; propodus roughly rectangular, posterior margin lined with fringed setae. Pleopod 1, endopod slightly shorter than exopod, bearing ®ve plumose marginal setae distally. Uropodal exopod ovate, with shallow notch in laterodistal margin, distally acute; endopod distally rounded, bearing numerous simple setae, length about 1.5 times basal width.

Male: Cephalon with eyes enlarged, well pigmented. Antennular ¯agellum of 15 articles bearing whorls of aesthetascs. Pereopod 1, carpus with posterodistal margin like a slightly oOEset tooth; propodus with band of setae near palm on mesial surface, palm bearing triangular tooth and about eight simple setae. Pleopod 1, endopod having seven distal plumose marginal setae, copulatory stylet rod-like, reaching beyond apex of ramus.

Remarks. Amakusanthura angophora Poore and Lew Ton, 1988b , from Queensland resembles the present species in having numerous erect setae on the telson, but the latter has a distinct lateral`shoulder’, unlike A. cosmoledo .

Etymology. The speci®c name, used as a noun in apposition, is taken from the holotype locality, Cosmoledo Island, one of the Aldabra group of islands.