Migmarma lorentzi, new species

(Figs. 50–52)

Material examined. Holotype: male (15.8 × 14.0 mm) (NMBA 625IIa), Noord River (= present day Lorentz River), New Guinea, ca. 4°15′S 138°40′E, coll. Lorentz Expedition 1909 (donated Zoological Museum Amsterdam, 1920). Paratype: 1 female (13.4 × 11.8 mm) (NMBA 625 IIa), same data as holotype .

Diagnosis. Carapace squarish, slightly longer than wide; dorsal carapace surface smooth, glabrous; epibranchial tooth distinct, separated by deep notch; posterolateral margins subparallel; outer surface of chela gently rugose, smooth flattened granules, outer surface gently convex, not flat, ventral margin of palm gently concave; suture between male thoracic sternites 3 and 4 distinct; ambulatory merus short, broad; male pleon subrectangular, telson rounded, slightly sunken into distal margin of somite 6; G1 slender, gently curved, chitinous distal part long, tapering, relatively slender, subspatuliform, tip appears bifurcated.

Etymology. The species is named after Hendrikus Albertus Lorentz, the Dutch explorer for whom its type locality river is also named.

Remarks. In having the male telson only slightly sunken into somite 6, Migmarma lorentzi, new species, superficially resembles species of Bresedium, notably B. laevimanum, but can easily be separated by the male telson being rounded and the pleonal somite 6 less broad (Fig. 50E) (versus telson more elongate and somite 6 is wider and more rectangular in shape in B. laevimanum; Figs. 31F–H, 42A); and the G1 is also proportionately stouter and the tip of the chitinous distal part is tapering and sharp (Figs. 50F–K, 51A–E) (versus G1 proportionately more slender and the tip of the chitinous distal part is flared in B. laevimanum; Fig. 42B–E).