Members of the Amblyoponinae (especially Amblypone silvestrii) are called Dracula ants, after Count Dracula, the fictional vampire, referring to their unusual feeding habits; queens and workers practice a form of "non-destructive cannibalism", chewing holes into and feeding on the haemolymph (insect "blood") of the colony's own larvae.
Capsaspora is a monotypic genus containg the single species Capsaspora owczarzaki, a single-celled eukaryote which is a symbiont in the haemolymph of the tropical freshwater snail Biomphalaria glabrata.
In the freshwater Planorbid snails, however, the haemocyanin is replaced by haemoglobin, and thus their haemolymph is red rather than blue.