Sakaina incisa

Sakai, 1969

A tiny species like other congeners. In general view the new species is closely related to Sakaina japonica Serène and also to Sakaina asiatica (Sakai). The carapace is transversely quadrilateral. The front protrudes slightly beyond the eyes and is medially notched. Just behind the frontal lobes the anterior surface of the carapace is defined by a rim of pubescence.
The anterior half of the antero-lateral border is evenly rounded, with a thick rim of marginal pubescence which, however, does not reach the external orbital portion, unlike that of Sakaina asiatica or Sakaina japonica. The dorsal surface is smooth and glabrous.
The chelipeds are symmetrical, the merus small, and the carpus swollen with its upper inner angle very slightly produced. The propodus is also swollen and its upper inner edge is slightly cristate; the fingers are unarmed.
The anterior two pairs of ambulatory legs are subequal in length and thickness; the third pair is shorter and more slender, and the last pair is strikingly reduced. The abdomen is peculiar in that the terminal segment of the male is oblong and incised at the distal end. In Sakaina japonica it is truncate and in Sakaina asiatica it is rounded.
Measurements: Length of carapace 2.5 mm, width of same 4 mm. (T. Sakai, 1969)

Type locality: Manazuru, Sagami Bay, Japan.
Range: Japan - Manazuru, Sagami Bay (Sakai, 1969, 1976), Otsuchi Bay, Iwate Prefecture (Takeda & Konishi, 1991).

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