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  Chromista
                            Calyptrosphaeraceae
                                     Anthosphaera
                                             Anthosphaera coronata
                                             Anthosphaera fragaria
                                                   [Calyptrolithina fragaria]
                                                   [Helladosphaera fragaria]
                                             Anthosphaera lafourcadei
                                             Anthosphaera lafourcadii
                                                   [Helladosphaera lafourcadei]
                                             Anthosphaera periperforata
                                     Balaniger
                                             Balaniger balticus
                                     Calicasphaera
                                             Calicasphaera blokii
                                             Calicasphaera concava
                                             Calicasphaera diconstricta
                                     Calyptrolithina
                                             Calyptrolithina divergens
                                             Calyptrolithina isselii
                                             Calyptrolithina lafourcadii
                                             Calyptrolithina magnaghii
                                                   [Helladosphaera fastigata]
                                                   [Helladosphaera magnaghii]
                                             Calyptrolithina multipora
                                                   [Corisphaera multipora]
                                                   [Helladosphaera dalmatica]
                                             Calyptrolithina wettsteinii
                                                   [Corisphaera wettsteinii]
                                                   [Homozygosphaera wettsteinii]
                                                   [Zygosphaera wettsteinii]
                                     Calyptrolithophora
                                             Calyptrolithophora catillifera
                                                   [Calyptrosphaera catillifera]
                                             Calyptrolithophora galea
                                             Calyptrolithophora gracillima
                                                   [Calyptrosphaera gracillima]
                                                   [Sphaerocalyptra gracillima]
                                             Calyptrolithophora hasleana
                                                   [Corisphaera hasleana]
                                                   [Sphaerocalyptra hasleana]
                                             Calyptrolithophora papillifera
                                                   [Calyptrosphaera papillifera]
                                                   [Sphaerocalyptra papillifera]
                                     Calyptrosphaera
                                             Calyptrosphaera glabra
                                             Calyptrosphaera globosa
                                             Calyptrosphaera oblonga
                                             Calyptrosphaera sanlucari
                                             Calyptrosphaera sphaeroidea
                                               Calyptrosphaera sphaeroidea var. minor
                                     Corisphaera
                                             Corisphaera amplior
                                             Corisphaera coriolis
                                             Corisphaera corona
                                             Corisphaera fagei
                                             Corisphaera fibula
                                             Corisphaera fournieri
                                             Corisphaera gracilis
                                                   [Helladosphaera gracilis]
                                             Corisphaera magnifica
                                             Corisphaera margaritacea
                                             Corisphaera perennis
                                               Corisphaera perennis var. alpha
                                             Corisphaera stellulata
                                             Corisphaera strigilis
                                             Corisphaera tenax
                                             Corisphaera tyrrheniensis
                                             Corisphaera vivesii
                                     Crystallolithus
                                     Daktylethra
                                             Daktylethra pirus
                                                   [Calyptrolithophora pirus]
                                                   [Calyptrosphaera pirus]
                                             Daktylethra punctulata
                                     Flosculosphaera
                                             Flosculosphaera calceolariopsis
                                             Flosculosphaera sacculus
                                     Gliscolithus
                                             Gliscolithus amitakarenae
                                             Gliscolithus amitakareniae
                                     Helladosphaera
                                             Helladosphaera arethusae
                                             Helladosphaera cornifera
                                                   [Syracosphaera cornifera]
                                             Helladosphaera halldalii
                                             Helladosphaera pienaarii
                                             Helladosphaera richardii
                                             Helladosphaera strigilis
                                             Helladosphaera strigillata
                                             Helladosphaera vavilovii
                                                   [Homozygosphaera vavilovii]
                                     Holococcolithophora
                                             Holococcolithophora cialdii
                                                   [Calyptrosphaera cialdii]
                                             Holococcolithophora dentata
                                                   [Calyptrosphaera dentata]
                                             Holococcolithophora galea
                                                   [Calyptrosphaera galea]
                                             Holococcolithophora heimdaliae
                                                   [Calyptrosphaera heimdalae]
                                             Holococcolithophora radiata
                                                   [Calyptrosphaera radiata]
                                             Holococcolithophora sphaeroidea
                                     Homozygosphaera
                                             Homozygosphaera arethusae
                                                   [Corisphaera arethusae]
                                             Homozygosphaera spinosa
                                                   [Corisphaera spinosa]
                                             Homozygosphaera strigilis
                                             Homozygosphaera tholifera
                                                   [Calyptrosphaera tholifera]
                                             Homozygosphaera triarcha
                                             Homozygosphaera vercelli
                                     Periphyllophora
                                             Periphyllophora mirabilis
                                                   [Calyptrosphaera mirabilis]
                                     Poricalyptra
                                             Poricalyptra aurisinae
                                                   [Helladosphaera aurisinae]
                                             Poricalyptra gaarderae
                                                   [Calyptrolithina gaarderae]
                                                   [Helladosphaera gaarderae]
                                             Poricalyptra isselii
                                                   [Helladosphaera isselii]
                                             Poricalyptra magnaghii
                                     Poritectolithus
                                             Poritectolithus maximus
                                             Poritectolithus poritectum
                                                   [Calyptrolithina poritectum]
                                                   [Helladosphaera poritectum]
                                             Poritectolithus tyronus
                                     Quaternariella
                                             Quaternariella obscura
                                     Sphaerocalyptra
                                             Sphaerocalyptra adenensis
                                             Sphaerocalyptra quadridentata
                                                   [Calyptrosphaera quadridentata]
                                     Syracolithus
                                             Syracolithus bicorium
                                             Syracolithus bicorius
                                             Syracolithus catilliferus
                                                   [Syracosphaera catillifera]
                                             Syracolithus dalmaticus
                                                   [Homozygosphaera halldalii]
                                                   [Homozygosphaera quadriperforata]
                                                   [Syracosphaera dalmatica]
                                             Syracolithus globula
                                             Syracolithus ossa
                                             Syracolithus ponticuliferus
                                                   [Corisphaera ponticulifera]
                                             Syracolithus schilleri
                                                   [Discolithina macropora]
                                                   [Discolithus macroporus]
                                                   [Homozygosphaera Schilleri]
                                                   [Syracosphaera schilleri]
                                             Syracolithus scutatus
                                             Syracolithus verruca
                                               Syracolithus verruca var. isra?lus
                                               Syracolithus verruca var. isra‘lus
                                     Turrisphaera
                                     Zygosphaera
                                             Zygosphaera acuta
                                             Zygosphaera amoena
                                             Zygosphaera aurea
                                             Zygosphaera bannockii
                                                   [Sphaerocalyptra bannockii]
                                             Zygosphaera brytika
                                             Zygosphaera debilis
                                             Zygosphaera divergens
                                                   Zygosphaera divergens f. tuberosa
                                             Zygosphaera hellenica
                                             Zygosphaera marsilii
                                                   [Sphaerocalyptra marsilii]
                                             Zygosphaera minor
                                             Zygosphaera minuta
                                             Zygosphaera regalis