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  Chromista
      Heterokontophyta
            Coscinodiscophyceae
                    Hemiaulales
                            Hemiaulaceae
                                     Abas
                                             Abas wittii
                                     Ailuretta
                                             Ailuretta cerataulinoides
                                             Ailuretta rotunda
                                     Baxteriopsis
                                             Baxteriopsis brunii
                                     Bicornis
                                             Bicornis kittonii
                                                   [Hemiaulus kittonii]
                                     Briggera
                                             Briggera ornithocephala
                                     Cerataulina
                                             Cerataulina bergonii
                                               Cerataulina bergonii var. elongata
                                             Cerataulina bicornis
                                                   [Cerataulina compacta]
                                                   [Cerataulina daemon]
                                             Cerataulina chapmanii
                                             Cerataulina cretacea
                                             Cerataulina curvata
                                             Cerataulina dentata
                                             Cerataulina mediterranea
                                             Cerataulina pelagica
                                                   [Cerataulus bergonii]
                                             Cerataulina praebergonii
                                             Cerataulina velifera
                                     Climacodium
                                             Climacodium biconcavum
                                             Climacodium frauenfeldianum
                                     Cylindrospira
                                             Cylindrospira simsiae
                                                   Cylindrospira simsiae f. homannii
                                     Eucampia
                                             Eucampia antarctica
                                                   [Eucampia antarctica f. spiralis]
                                                   [Eucampia balaustium f. aestiva]
                                                   [Eucampia balaustium f. hiberna]
                                                   [Eucampia balaustium var. minor]
                                                   [Eucampia balaustium]
                                                   [Moelleria antarctica]
                                               Eucampia antarctica var. recta
                                                     [Eucampia antarctica f. recta]
                                                     [Hemiaulus antarctica]
                                                     [Hemiaulus antarcticus]
                                             Eucampia biconcava
                                             Eucampia cornuta
                                                   [Moelleria cornuta]
                                             Eucampia groenlandica
                                                   Eucampia groenlandica f. atlantica
                                             Eucampia hemiauloides
                                             Eucampia minor
                                             Eucampia payeri
                                             Eucampia recta
                                             Eucampia striata
                                               Eucampia striata var. maxima
                                             Eucampia virginica
                                             Eucampia zodiacus
                                                   [Eucampia britannica]
                                                   [Eucampia nodosa]
                                                   Eucampia zodiacus f. cylindrocornis
                                               Eucampia zodiacus var. cornigera
                                             Eucampia zoodiacus
                                     Fontigonium
                                             Fontigonium rectangulare
                                     Hemiaulus
                                             Hemiaulus affixus
                                             Hemiaulus alatus
                                             Hemiaulus algidus
                                             Hemiaulus altar
                                             Hemiaulus alter
                                             Hemiaulus altus
                                             Hemiaulus ambiguus
                                             Hemiaulus amplectans
                                               Hemiaulus amplectans var. major
                                             Hemiaulus andrewsi
                                             Hemiaulus angularis
                                             Hemiaulus angustus
                                             Hemiaulus antiquus
                                             Hemiaulus applanatus
                                             Hemiaulus arcticus
                                                   Hemiaulus arcticus f. crenulatus
                                               Hemiaulus arcticus var. bornholmiensis
                                             Hemiaulus armatus
                                             Hemiaulus asymmetricus
                                             Hemiaulus australis
                                             Hemiaulus barbadensis
                                             Hemiaulus biddulphia
                                             Hemiaulus biharensis
                                             Hemiaulus bipons
                                             Hemiaulus bombus
                                             Hemiaulus californicus
                                             Hemiaulus capitatus
                                             Hemiaulus caracteristicus
                                             Hemiaulus caverna
                                             Hemiaulus centralitenuis
                                             Hemiaulus chinensis
                                             Hemiaulus circularis
                                             Hemiaulus claviger
                                             Hemiaulus coronatus
                                             Hemiaulus crenatus
                                             Hemiaulus curvatulus
                                             Hemiaulus danicus
                                             Hemiaulus danosuecicus
                                                   Hemiaulus danosuecicus f. compressa
                                             Hemiaulus dissimilis
                                             Hemiaulus diversus
                                             Hemiaulus dubius
                                             Hemiaulus echinulatus
                                             Hemiaulus elegans
                                               Hemiaulus elegans var. intermedia
                                             Hemiaulus exiguus
                                             Hemiaulus exsculptus
                                             Hemiaulus februatus
                                             Hemiaulus florifer
                                             Hemiaulus fragilis
                                             Hemiaulus giganteus
                                             Hemiaulus glacialis
                                             Hemiaulus gleseri
                                             Hemiaulus gondolaformis
                                             Hemiaulus grassus
                                             Hemiaulus grunowii
                                             Hemiaulus haitensis
                                             Hemiaulus hastatus
                                             Hemiaulus hauckii
                                                   [Hemiaulus delicatulus]
                                             Hemiaulus heibergii
                                               Hemiaulus heibergii var. affinis
                                             Hemiaulus hostilis
                                               Hemiaulus hostilis var. polaris
                                             Hemiaulus hungaricus
                                             Hemiaulus hyalinus
                                             Hemiaulus hyperboreus
                                               Hemiaulus hyperboreus var. polaris
                                             Hemiaulus immanis
                                             Hemiaulus inaequilaterus
                                             Hemiaulus incisus
                                             Hemiaulus includens
                                             Hemiaulus incurvus
                                             Hemiaulus indicus
                                             Hemiaulus klushnikovii
                                             Hemiaulus kondai
                                             Hemiaulus laevissimus
                                             Hemiaulus latus
                                             Hemiaulus lobatus
                                             Hemiaulus longicornis
                                             Hemiaulus longispinosus
                                             Hemiaulus loricatus
                                             Hemiaulus lyriformis
                                             Hemiaulus malleolus
                                             Hemiaulus marplatensis
                                             Hemiaulus membranaceus
                                             Hemiaulus menisculus
                                             Hemiaulus minimus
                                             Hemiaulus minutus
                                             Hemiaulus mirus
                                             Hemiaulus mitra
                                               Hemiaulus mitra var. areolata
                                               Hemiaulus mitra var. bergii
                                             Hemiaulus monicae
                                             Hemiaulus moniliformis
                                             Hemiaulus mucronatus
                                             Hemiaulus novocastrensis
                                             Hemiaulus nudus
                                             Hemiaulus obtusus
                                             Hemiaulus originalis
                                             Hemiaulus ornithocephalus
                                               Hemiaulus ornithocephalus var. nicobarica
                                             Hemiaulus orthoceras
                                             Hemiaulus pacificus
                                             Hemiaulus payeri
                                             Hemiaulus peripterus
                                             Hemiaulus perlongus
                                             Hemiaulus petasiformis
                                             Hemiaulus pileolus
                                               Hemiaulus pileolus var. baccata
                                             Hemiaulus plicatus
                                             Hemiaulus podagricus
                                             Hemiaulus polycystinorum
                                               Hemiaulus polycystinorum var. brevicornis
                                               Hemiaulus polycystinorum var. dissonus
                                               Hemiaulus polycystinorum var. mesolepta
                                               Hemiaulus polycystinorum var. siberica
                                               Hemiaulus polycystinorum var. simbirskiana
                                             Hemiaulus polymorphus
                                               Hemiaulus polymorphus var. charkovianus
                                               Hemiaulus polymorphus var. frigida
                                               Hemiaulus polymorphus var. glacialis
                                               Hemiaulus polymorphus var. morsiana
                                               Hemiaulus polymorphus var. pusilla
                                               Hemiaulus polymorphus var. virginica
                                             Hemiaulus pra-elegans
                                             Hemiaulus prolongatus
                                             Hemiaulus proschkinae-lavrenkoae
                                             Hemiaulus proteus
                                             Hemiaulus pulvinatus
                                             Hemiaulus punctatus
                                             Hemiaulus pungens
                                             Hemiaulus pyxilloides
                                             Hemiaulus rapax
                                             Hemiaulus rectus
                                               Hemiaulus rectus var. twista
                                             Hemiaulus reflexispinosus
                                             Hemiaulus regina
                                             Hemiaulus reticularis
                                             Hemiaulus reticulatus
                                             Hemiaulus robustus
                                             Hemiaulus rossicus
                                             Hemiaulus rostratus
                                             Hemiaulus saratovianus
                                             Hemiaulus schmidti
                                             Hemiaulus sibericus
                                             Hemiaulus simplex
                                             Hemiaulus simulacrum
                                             Hemiaulus sinensis
                                             Hemiaulus solenoceros
                                             Hemiaulus speciosus
                                             Hemiaulus spinosus
                                             Hemiaulus sporalis
                                             Hemiaulus stabilus
                                             Hemiaulus subacutus
                                             Hemiaulus subsymmetricus
                                             Hemiaulus symmetricus
                                             Hemiaulus szaboi
                                             Hemiaulus taurus
                                             Hemiaulus tenuicornis
                                             Hemiaulus tschestnovii
                                             Hemiaulus tubulosus
                                             Hemiaulus tumidocornus
                                             Hemiaulus undulatus
                                             Hemiaulus unicornutus
                                             Hemiaulus velatus
                                             Hemiaulus verrucosus
                                             Hemiaulus vitreus
                                             Hemiaulus vulgaris
                                             Hemiaulus walfishii
                                             Hemiaulus weissflogii
                                             Hemiaulus weissii
                                             Hemiaulus wittii
                                     Keratophora
                                             Keratophora nitida
                                             Keratophora robusta
                                             Keratophora russica
                                     Kittonia
                                             Kittonia barboi
                                             Kittonia deflexa
                                             Kittonia elaborata
                                                   [Biddulphia elaborata]
                                             Kittonia gigantea
                                             Kittonia granulata
                                             Kittonia grevilleana
                                             Kittonia hannai
                                             Kittonia hillabyana
                                             Kittonia morenoensis
                                             Kittonia pentagona
                                             Kittonia ruski
                                             Kittonia tenuicornis
                                             Kittonia tesrapoda
                                             Kittonia tripedia
                                             Kittonia virgata
                                     Monobrachia
                                             Monobrachia simplex
                                             Monobrachia unicornuta
                                     Pseudorutilaria
                                             Pseudorutilaria monile
                                             Pseudorutilaria monomembranacea
                                     Riedelia
                                             Riedelia alata
                                             Riedelia altar
                                             Riedelia clavigera
                                             Riedelia longicornis
                                             Riedelia lyriformis
                                             Riedelia mirabilis
                                             Riedelia sublevata
                                             Riedelia tenuicornis
                                     Rymariopsis
                                             Rymariopsis akibae
                                     Sphynctolethus
                                             Sphynctolethus monstrosus
                                             Sphynctolethus pacificus
                                     Strelnikovia
                                             Strelnikovia antiqua
                                                   [Rutilaria antiqua]
                                             Strelnikovia incerta
                                             Strelnikovia inclinata
                                             Strelnikovia reniformis
                                             Strelnikovia tumida
                                     Trinacria
                                             Trinacria acuminata
                                             Trinacria altar
                                             Trinacria anisimovae
                                             Trinacria anissimovae
                                             Trinacria antiqua
                                             Trinacria aries
                                             Trinacria barronii
                                                   Trinacria barronii f. barronii
                                                   Trinacria barronii f. tetragona
                                             Trinacria cancellata
                                             Trinacria caudata
                                             Trinacria chenevierei
                                             Trinacria conifera
                                             Trinacria cornuta
                                                   Trinacria cornuta f. pentagona
                                             Trinacria coronata
                                             Trinacria cristata
                                             Trinacria deciusi
                                               Trinacria deciusi var. summaria
                                             Trinacria deciusii
                                             Trinacria ecostata
                                             Trinacria excavata
                                                   Trinacria excavata f. cretacea
                                                   Trinacria excavata f. inflata
                                               Trinacria excavata var. archangelskiana
                                               Trinacria excavata var. producta
                                               Trinacria excavata var. pulchra
                                               Trinacria excavata var. simbirskiana
                                             Trinacria exsculpta
                                             Trinacria fimbriata
                                             Trinacria fragilis
                                             Trinacria grevillei
                                             Trinacria grunowii
                                             Trinacria heibergii
                                                   Trinacria heibergii f. kittoniana
                                               Trinacria heibergii var. sparsimpunctata
                                             Trinacria hystrix
                                             Trinacria indefinita
                                             Trinacria insipiens
                                               Trinacria insipiens var. intermedia
                                               Trinacria insipiens var. obtusangula
                                               Trinacria insipiens var. robusta
                                             Trinacria insolita
                                             Trinacria interlineata
                                             Trinacria jeremiae
                                             Trinacria jordanii
                                             Trinacria kittoniana
                                             Trinacria lecointei
                                             Trinacria limpida
                                             Trinacria lingulata
                                             Trinacria media
                                             Trinacria mertzii
                                             Trinacria mucronata
                                             Trinacria muelleri
                                               Trinacria muelleri var. russica
                                             Trinacria nitescens
                                             Trinacria pachtii
                                             Trinacria palmipes
                                             Trinacria pantocsekii
                                             Trinacria paradoxa
                                               Trinacria paradoxa var. valida
                                             Trinacria pileolus
                                               Trinacria pileolus var. josefina
                                               Trinacria pileolus var. juetlandica
                                               Trinacria pileolus var. media
                                               Trinacria pileolus var. seticulosa
                                               Trinacria pileolus var. spinosa
                                               Trinacria pileolus var. tetragona
                                             Trinacria praecellens
                                             Trinacria praetenuis
                                               Trinacria praetenuis var. perminuta
                                               Trinacria praetenuis var. simbirskiana
                                             Trinacria princeps
                                             Trinacria racovitzae
                                                   Trinacria racovitzae f. excavata
                                             Trinacria regina
                                               Trinacria regina var. obtusa
                                               Trinacria regina var. punctulata
                                               Trinacria regina var. tetragona
                                             Trinacria rossica
                                             Trinacria semseyi
                                             Trinacria senta
                                             Trinacria simulacroides
                                             Trinacria simulacrum
                                             Trinacria sparsa
                                             Trinacria subcapitata
                                               Trinacria subcapitata var. siberica
                                             Trinacria subcoronata
                                             Trinacria tessela
                                             Trinacria tripedalis
                                             Trinacria tristictia
                                             Trinacria tschestnovii
                                             Trinacria venosa
                                                   Trinacria venosa f. major
                                             Trinacria ventricosa
                                             Trinacria vetustissima
                                             Trinacria weissflogii
                                             Trinacria wittii