Acanthonyx sanctaehelenae

Acanthonyx sanctaehelenae Chace, 1966:648, figs. 12,13e–h

MATERIAL.—Manning 1971 Collection: Sta ASC-12, South West Bay: 4 males [2.1–3.9], 2 ovig. females [3.5–3.7].—Sta ASC-13, Georgetown: 6 males [5.3–6.9], 1 female [3.3].—Sta ASC-15, English Bay: 1 male [2.5], 1 female [3.2],3 juveniles [1.7–2.0].—Sta ASC-21.English Bay: 1 male [4.9],3 females [3.1–3.8],2 ovig. [3.1–3.8].—Sta ASC-23, South West Bay: 1 male [4.3].

Smithsonian 1976 Collection: Sta lB–76, McArthur Point: 1 ovig. female [3.6].

SIZE.—Carapace lengths of males, 2.1–6.9 mm; of females, 3.1–3.8 mm; of ovigerous females, 3.1–3.8 mm; of juveniles, 1.7–2.0 mm. These specimens are considerably smaller than those reported by Chace (1966) from Saint Helena, which ranged to 18 mm in carapace length.

HABITAT.—On Ascension this species was collected by using a formalin wash of calcareous algae on rocks, and of green algal clumps, colonies of filamentous green algae, Padina, and Sargassum found intertidally on rocks.

DISTRIBUTION.—Known only from Saint Helena and Ascension islands; littoral and sublittoral.