Eupilumnus globosus (Dana, 1852)

Eupilumnus globosus (Dana, 1852) View in CoL [Jn: Marumi-kebukagani]

( Fig. 6E–F View Fig )

Pilumnus globosus Dana, 1852a, p.81 ; 1852b, p. 236; 1855, pl. 13 fig. 10. — Miers, 1886, p. 155. —De Man, 1890, p. 59, pl. 3 fig. 3. — Rathbun, 1907, p. 56.

Pilumnus ovalis A. Milne-Edwards, 1867, p. 280 .

Pilumnus margaritatus Ortmann, 1893, p. 436 .

Actumnus globosus : Borradaile, 1902, p. 248.

Globopilumnus globosus View in CoL : Balss, 1933, p.7, pl. 1 figs. 1–2. — Sakai, 1939, p.514, pl. 98 fig. 3; 1976, pp.470 (in English), 287 (in Japanese), pl. 171 fig. 3. — Holthuis, 1953, p.21. — Forest & Guinot, 1961, p.121. — Guinot-Dumortier, 1961, p. 99, figs. 1–2, 5–6. — Edmondson, 1962, p. 285, figs. 24d–e, 25d. — Takeda & Nagai, 1983, p.48 (in key). — Dai et al., 1986, p.324, fig. 171B, pl. 46 fig. 6. — Dai & Yang, 1991, p.348, fig. 171B, pl. 46 fig. 6.

Globopilumnus globosus spinosus Balss, 1933, p. 7 View in CoL .

Eupilumnus globosus View in CoL : Ng et al., 2001, p.24 (in list). — Ng et al., 2008, p.65 (in list).

Material examined. Chichi-jima Is. —Ototojima I., 1 Ə (NSMT-Cr 31650; cb 8.9×cl 7.6 mm), 1 ovig.8 (NSMT-Cr 31651; cb 13.6× cl 11.9 mm), 1 8 (NSMT-Cr 31652; cb 10.4×cl 7.6 mm), 10-VII-1969, M. Imajima leg.

Remarks. Guinot-Dumortier (1961) reviewed the genus Globopilumnus Balss, 1933 , and established two West African and three Indo-West Pacific species. Since this contribution, Globopilumnus is widely used for the Indo-West Pacific species, but Rathbun (1930) has already made Pilumnus (Eupilumnus) Kossmann, 1877 , as a senior synonym of Globopilumnus . The name of the genus Globopilumnus is nomenclatorially invalid, being explained as such by Ng et al. (2001).

On describing a new species of the genus Globopilumnus , now Eupilumnus, Takeda and Nagai (1983) made a key to distinguish five known and one new species. Among them, E. globosus (Dana, 1852) and E. actumnoides (A. Milne-Edwards, 1873) are morphologically close to each other, and the other species may be easily separated from the congeners. In these two species, the carapace is thickly covered with stiff setae, with four or five anterolateral tubercles in E. globosus ( Fig. 6E View Fig ) and six or seven tubercles in E. actumnoides . Otherwise, the ambulatory legs are unarmed in E. globosus , but armed with a distal spine on each propodus of first three pairs in E. actumnoides . It is said that the carapace posterolateral margins of both sides are subparallel in E. globosus and convergent toward the lateral ends of the carapace posterior margin in E. actumnoides . However, the difference of the carapace contour thus mentioned may be not always a reliable character to distinguish the two species in question.

Eupilumnus fragaria ( Yang, Dai and Ng, 1998) View in CoL was described from the Nansha Islands as a close relative of E. globosus View in CoL . According to the description and the key prepared by the original authors ( Yang et al., 1998), the carapace anterolateral margin is armed with 3 small granules (vs. 4–5 granules), the carapace posterolateral margin is gently converging towards the carapace posterior margin (vs. distinctly converging), the granules on the palm outer surface are well spaced (vs. densely arranged), the G1 tip is not flared (vs. flared), and the G2 tip is about half length of the basal segment (vs. longer than half length of the basal segment). The additional specimens should be examined.

Distribution. Laccadive Islands and Mergui Archipelago in the central Indian Ocean; South China Sea, Micronesian islands, Philippines, Japan, Hawaii, Tahiti and Tuamotu Islands in the Pacific Ocean. New to the Ogasawara Islands.