spermatobium spermatobium spermatobium is a genus of parasites of the phylum apicomplexa. it infects oligochaete worms. spermatobium scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: apicomplexa class: aconoidasida order: achromatorida suborder: babesiina family: haemohormidiidae genus: spermatobium species spermatobium eclipidrili spermatobium freundi history this genus was described by eisen in 1895. this genus has been little studied and not much is known about it. taxonomy two species in this genus have been described: spermatobium eclipidrili and spermatobium freundi. the type species is s. eclipidrili. description this parasite infects the sperm sacs of oligochaete worms. the sporogonia contain numerous sporoblasts or spores and a residuum.