From access licence JKM/MBS.1000-2/2/1 JLD.1 (223): A new species of harpacticoid copepod, Peltidium penyu, is described from a marine cave (Turtle Tomb) in Sabah, Malaysia. The Malaysian Peltidium is characterised by a combination of the following characters: the skeletal pattern of chitin struts; the armaments of the maxilliped; and the construction of the maxilla. The new species seems to be related to P. exiguum, sharing the characteristics of skeletal pattern of chitin struts and armature formula of P1-P5, but differs from the Arafuran species based on segmentation of antennule, as well as the construction and armament of the maxilla and maxilliped.