Accalathura hastata, 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 : 2101-2103

Accalathura hastata sp. nov.

(Figure 30)

Type material. HOLOTYPE: USNM 253138 , ovigerous m 13.7 mm, sta F3-85, rubble from intertidal reef ¯at, Picard Is., Aldabra, 15 March 1985 . PARATYPES: USNM 253129 , one pre- l11.0 mm, sta F7-85, rubble from intertidal reef ¯at, Picard Is., Aldabra, 18 March 1985 . USNM 153140 , three non-ovigerous m, 12.8±14.9 mm, 12 juveniles, sta F8-87, rubble from intertidal reef, Passe Hoareau, Aldabra, 11 April 1987 .

Other material examined. USNM 253141 , 12 non-ovigerous m, 21 juveniles , from 11 stations on Aldabra, rubble, intertidal, 16 m. USNM 253142 , one ovigerous FIG. 30. Accalathura hastata sp. nov.: (A) ldorsal view; (B) pleotelson; (C) pereopod 1; (D) pereopod 1, propodal lobe enlarged; (E) pereopod 2; (F) uropodal exopod; (G) uropodal protopod and endopod; (H) lpleopod 2; (I) pereopod 4 .

m, ®ve non-ovigerous m, eight juveniles, from seven stations on Aldabra, rubble, intertidal, 2 m, coll. K. Fauchald. USNM 253143 , one non-ovigerou s m, two juveniles, rubble from three stations on outer reef slope oOE Picard Is., Aldabra, 10 m, coll. J.D. Thomas.

Diagnosis. Dorsally pigmented. Telson parallel-sided for much of length, tapering posteriorly to apical angle of about 90 ss. Pereopod 1, propodus with proximal palmar lobe or`thumb’ at right angle to rest of palm, lobe broadly digitiform. Pereopod 2, propodus 2.5 times longer than wide, with ®ve robust setae on palm. Pereopod 4, carpus with four setae, propodus with seven robust setae on posterior margin; propodus 3.6 times longer than wide. Pereopod 7, uropodal exopod 3.7 times longer than wide, reaching end of peduncle, latter reaching 85% along telson length, mesiodistal projection slight; endopod distally rounded, reaching beyond telson by half its length, about 1.5 times longer than wide. Pleopod 2 of pre-male, copulatory stylet articulating at proximal third of mesial margin of endopod, distally somewhat expanded.

Remarks. With no mature male and only a premale available, in which the copulatory stylet is distally expanded, (suggesting a more complex structure in the mature male), it is di cult to assign the present species to any of the previously described forms.

Etymology. The speci®c name, from the Latin for a spear, refers to the shape of the telson.