aconoidasida aconoidasida the aconoidasida are a class of apicomplexan parasites created by mehlhorn et al in 1980. aconoidasida haemoproteus ilanpapernai (haemoproteidae) scientific classification domain: eukaryota clade: diaphoretickes clade: tsar clade: sar clade: alveolata phylum: apicomplexa class: aconoidasidamehlhorn et al., 1980 orders haemospororida piroplasmida synonyms hematozoa vivier, 1982 description organisms in this class bear a tip at one end of their outer membrane. this apical complex includes vesicles called rhoptries and micronemes, which open at the anterior of the cell. these secrete enzymes that allow the parasite to enter other cells. the tip is surrounded by a band of microtubules, called the polar ring. as the name indicates, aconoidasida (from greek: negative prefix a- = "lacking") lack a conoid (they do have one only during the ookinete stage) in contrast to the class conoidasida which have one throughout their life cycle.