Notes on the occurrence of intersex in Amphipods

It has long been assumed that intersex is common amongst the Amphipoda. An investigation of museum specimens, and a review of relevant literature were conducted with the aim of assessing how widespread intersexuality was amongst this group of Crustacea. We demonstrate that intersex is, indeed, widespread throughout the Amphipoda, occurring in at least 20 different species covering several different families, from marine to freshwater habitats, and from Arctic, Temperate and Mediterranean environments.