Periophthalmus spilotus, a new species of mudskipper from Sumatra (Gobiidae : Oxudercinae)

A new species of mudskipper, Periophthalmus spilotus, is described on the b asis of 16 specimens from Sumatra, Indonesia. It differs from other species of Periophthalmus by the following combination of characters: pelvic fins totally united into rounded disk; first dorsal fin high, greyish, no spots on fin nor elongate spines; second dorsal fin typically with 14 total eleme nts; anal fin typically with either 14 or 15 total elements; length of anal -fin base 21.8-29.0% SL; and length of second dorsal-fin base 22.5-26.7% SL . This species is most similar to, and probably most closely related to, P. chrysospilos.