A new species _Dactylospora mangrovei_ is described and illustrated and compared with _D. haliotrepha_ and _D. canariensis_, all marine inhabiting species. _Dactylospora haliotrepha_ and _D. mangrovei_ are tropical/sub-tropical mangrove species collected in Hong Kong, Malaysia, Taiwan and Thailand, while _D. canariensis_ was described from temperate waters. A map of the geographical distribution of the three marine _Dactylospora_ species is presented. ... Read more