A new species of Ptychognathus Stimpson, 1858, from East and Southeast Asia, previously identified as Ptychognathus barbatus (A. Milne-Edwards, 1873) (Crustacea, Decapoda, Brachyura, Varunidae)

Ptychognathus dajie sp. nov. A–C, E, G–I, K–P. Holotype male (13.2 × 11.6 mm, ZRC 2024.0072); D, F, J, Q. Paratype female (10.6 × 9.2 mm, NCHUZOOL 17356). A. Carapace; B. Left third maxilliped; C, D. Left carpus of cheliped (dorsal view); E, F. Outer view of left cheliped; G. left third ambulatory leg (P4); H. Left forth ambulatory leg (P5); I, J. Pleon; I’. telson; K, L. Right G1 (dorsal view); M, N. Right G1 (lateral view); O, P. Right G1 (ventral view); Q. Right vulva.