Migmarma modestum (De Man, 1902)

(Figs. 45, 46)

Sesarma (Sesarma) modesta De Man, 1902: 511, pl. 19 fig. 8; Tesch, 1917: 175; Roux, 1917: 619.

Sesarma (Sesarma) modestum – Serène, 1968: 105.

Pseudosesarma modestum – Serène & Soh, 1970: 400; Ng et al., 2008a: 222.

Material examined. Holotype: male (25.0 × 20.9 mm) (SMF 1989), Ternate, Moluccas, Indonesia, coll. W. Kükenthal, 26 December 1893 – 11 June 1894.

Diagnosis. Carapace trapezoidal, wider than long; dorsal carapace surface uneven but not setose; epibranchial tooth distinct, separated by deep notch; posterolateral margins slightly divergent; outer surface of chela covered with rounded granules, those on margins relatively larger, outer surface almost flat, ventral margin of palm almost straight; suture between male thoracic sternites 3 and 4 distinct; ambulatory merus short, broad; male pleon triangular, telson relatively elongate, not sunken into distal margin of somite 6; male pleonal somite 6 relatively broader; G1 relatively stout, almost straight, chitinous distal part relatively short, stout, tip subtruncate.

Remarks. The identity of this species has long been uncertain. Serène & Soh (1970) referred it to Pseudosesarma where it has remained since, and the type has never been redescribed or refigured. Roux (1917) identified a female specimen from New Guinea to this species, but this cannot be confirmed until it can be re-examined. It is also possible that his specimen belongs to M. lustrum, new species, which is close to M. modestum but differs markedly in the form of the G1 (see next species).