stylocephaloidea stylocephaloidea stylocephaloidea is a superfamily of parasitic alveolates of the phylum apicomplexia stylocephaloidea scientific classification domain: eukaryota (unranked): sar (unranked): alveolata phylum: apicomplexa class: conoidasida subclass: gregarinasina order: eugregarinorida suborder: septatorina superfamily: stylocephaloidea families actinocephalidae stylocephalidae taxonomy there are two families in this taxon. history this superfamily was established by clopton in 2009. description species in this taxon infect insects. syzygy is frontal or frontolateral. the gametocysts form an epicyst (ectocyst). the epicyst may rupture or dissolve. the sporocysts are released either singly or in chains.