TERRESTRIAL AMPHIPODA (TALITRIDAE) FROM ASCENSION AND SAINT-HELENA (SOUTH CENTRAL ATLANTIC)

Three species of Talitridae have been found well above sea-level (335- 853 m) of the islands of Ascension and St Helena in the South Central Atlantic: (1) Platorchestia platensis (Kroyer, 1845), collected on Asc ension only, represented by a morphologically and ecologically aberran t morph, provisionally called P. platensis f. monodi (Mateus et al., 1 986); (2) Talitriator insularis nov. sp., collected on both islands, a nd closely related to T cylindripes K. H. Bamard, 1940 from South Afri ca; (3) Talitroides alluaudi (Chevreux, 1896), likewise found on both islands, undoubtedly accidentally introduced with vegetation as in man y other areas of the world. Remarks are provided on Floresorchestia an d on Platorchestia joi nom. nov. (pro P. crassicomis (Derzhavin, 1937) , a preoccupied name).