veloxidium veloxidium veloxidium is a genus of parasitic alveolates in the phylum apicomplexa. species in this genus infect marine invertebrates. veloxidium scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: apicomplexa class: conoidasida subclass: gregarinasina order: archigregarinorida family: selenidioididae genus: veloxidium species veloxidium leptosynaptae taxonomy this species was described in 2012 by wakeman and leander. there is one species in this genus - veloxidium leptosynaptae. description this species infects the sea cucumber leptosynapta clarki. life cycle the parasite infects the gastrointestinal tract and is presumably transmitted by the orofaecal route but the details of this mechanism are presently unknown.