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  Animalia
      Arthropoda
        Chelicerata
            Pycnogonida
                    Pantopoda
                            Ammotheidae
                                     Achelia
                                             Achelia adelpha
                                             Achelia alaskensis
                                             Achelia anomala
                                             Achelia aspera
                                             Achelia assimilis
                                             Achelia australiensis
                                             Achelia barnardi
                                             Achelia besnardi
                                             Achelia bituberculata
                                             Achelia borealis
                                             Achelia boschi
                                             Achelia brevicauda
                                             Achelia brevirostris
                                             Achelia bullosa
                                             Achelia chelata
                                             Achelia columnaris
                                             Achelia communis
                                             Achelia crurispinifera
                                             Achelia curticauda
                                             Achelia deodata
                                             Achelia discoidea
                                             Achelia dohrni
                                             Achelia echinata
                                             Achelia fernandeziana
                                             Achelia gracilipes
                                             Achelia gracilis
                                             Achelia hariettae
                                             Achelia hispida
                                             Achelia hoekii
                                             Achelia kamtschatica
                                             Achelia kiiensis
                                             Achelia kurilensis
                                             Achelia laevis
                                             Achelia lagena
                                             Achelia lagenaria
                                             Achelia langi
                                             Achelia latifrons
                                             Achelia lavrentii
                                             Achelia litke
                                             Achelia longipes
                                             Achelia megacephala
                                             Achelia megova
                                             Achelia mixta
                                             Achelia nana
                                             Achelia neotenica
                                             Achelia nudiuscula
                                             Achelia orientalis
                                             Achelia orpax
                                             Achelia oshimai
                                             Achelia ovosetosa
                                             Achelia parvula
                                             Achelia pribilofensis
                                             Achelia quadridentata
                                             Achelia salebrosa
                                             Achelia sawayai
                                             Achelia scabra
                                             Achelia segmentata
                                             Achelia serratipalpis
                                             Achelia setulosa
                                             Achelia sheperdi
                                             Achelia simplex
                                             Achelia simplissima
                                             Achelia socors
                                             Achelia spatula
                                             Achelia spinosa
                                             Achelia spinoseta
                                             Achelia sufflata
                                             Achelia superba
                                             Achelia tenuipes
                                             Achelia transfuga
                                             Achelia transfugoides
                                             Achelia turba
                                             Achelia uschakovi
                                             Achelia vulgaris
                                             Achelia watamu
                                     Acheliana
                                             Acheliana tropicalis
                                     Ammothea
                                             Ammothea alaskensis
                                             Ammothea allopodes
                                             Ammothea antipodensis
                                             Ammothea armentis
                                             Ammothea australiensis
                                             Ammothea bentartica
                                             Ammothea bicorniculata
                                             Ammothea bigibbosa
                                             Ammothea calmani
                                             Ammothea carolinensis
                                             Ammothea clausi
                                             Ammothea depolaris
                                             Ammothea dorsiplicata
                                             Ammothea gibbosa
                                             Ammothea gigantea
                                             Ammothea glacialis
                                             Ammothea gordonae
                                             Ammothea gracilipes
                                             Ammothea hedgpethi
                                             Ammothea hilgendorfi
                                             Ammothea insularis
                                             Ammothea latifrons
                                             Ammothea longispina
                                             Ammothea magniceps
                                             Ammothea makara
                                             Ammothea meridionalis
                                             Ammothea minor
                                             Ammothea ovatoides
                                             Ammothea pribilofensis
                                             Ammothea profunda
                                             Ammothea sextarticulata
                                             Ammothea spicula
                                             Ammothea spinosa
                                             Ammothea striata
                                             Ammothea stylirostris
                                             Ammothea tetrapora
                                             Ammothea tibialis
                                             Ammothea uru
                                     Ammothella
                                             Ammothella alcalai
                                             Ammothella appendiculata
                                             Ammothella bi-unguiculata
                                             Ammothella biunguiculata
                                             Ammothella cymosa
                                             Ammothella dawsoni
                                             Ammothella elegantula
                                             Ammothella exornata
                                             Ammothella gibraltarensis
                                             Ammothella hedgpethi
                                             Ammothella heterosetosa
                                             Ammothella hispida
                                             Ammothella japonica
                                             Ammothella longioculata
                                             Ammothella longipes
                                             Ammothella marcusi
                                             Ammothella menziesi
                                             Ammothella nimia
                                             Ammothella omanensis
                                             Ammothella ovalis
                                             Ammothella pacifica
                                             Ammothella paradisiaca
                                             Ammothella pilosa
                                             Ammothella prolixa
                                             Ammothella rostrata
                                             Ammothella rotundata
                                             Ammothella rugulosa
                                             Ammothella schmitti
                                             Ammothella setacea
                                             Ammothella setosa
                                             Ammothella spinifera
                                             Ammothella stauromata
                                             Ammothella stocki
                                             Ammothella symbia
                                             Ammothella symbius
                                             Ammothella thetidis
                                             Ammothella tippula
                                             Ammothella tuberculata
                                             Ammothella tubicen
                                             Ammothella uniunguiculata
                                             Ammothella vanninii
                                             Ammothella verenae
                                     Ascorhynchus
                                             Ascorhynchus abyssi
                                             Ascorhynchus agassizi
                                             Ascorhynchus antipodus
                                             Ascorhynchus arenicolum
                                             Ascorhynchus armatus
                                             Ascorhynchus athernum
                                             Ascorhynchus auchenicum
                                             Ascorhynchus bacescui
                                             Ascorhynchus birsteini
                                             Ascorhynchus breviscapus
                                             Ascorhynchus bucerus
                                             Ascorhynchus cactoides
                                             Ascorhynchus castelli
                                             Ascorhynchus castellioides
                                             Ascorhynchus colei
                                             Ascorhynchus comatus
                                             Ascorhynchus compactus
                                             Ascorhynchus cooki
                                             Ascorhynchus corderoi
                                             Ascorhynchus crenatus
                                             Ascorhynchus cryptopygius
                                             Ascorhynchus cuculus
                                             Ascorhynchus dietheus
                                             Ascorhynchus discrepans
                                             Ascorhynchus endoparasiticus
                                             Ascorhynchus foresti
                                             Ascorhynchus fragilis
                                             Ascorhynchus fusticulus
                                             Ascorhynchus glaber
                                             Ascorhynchus glaberrimus
                                             Ascorhynchus hedgpethi
                                             Ascorhynchus heuresis
                                             Ascorhynchus hippos
                                             Ascorhynchus horologius
                                             Ascorhynchus inflatus
                                             Ascorhynchus insularus
                                             Ascorhynchus ios
                                             Ascorhynchus japonicus
                                             Ascorhynchus laterospinus
                                             Ascorhynchus latipes
                                             Ascorhynchus levissimus
                                             Ascorhynchus levivani
                                             Ascorhynchus longicollis
                                             Ascorhynchus losinalosinskii
                                             Ascorhynchus mariae
                                             Ascorhynchus melwardi
                                             Ascorhynchus meteor
                                             Ascorhynchus miniscapus
                                             Ascorhynchus minutus
                                             Ascorhynchus okai
                                             Ascorhynchus ornatus
                                             Ascorhynchus orthorhynchus
                                             Ascorhynchus ovicoxa
                                             Ascorhynchus pararmatus
                                             Ascorhynchus parvituberculatus
                                             Ascorhynchus paxillus
                                             Ascorhynchus pennai
                                             Ascorhynchus petilus
                                             Ascorhynchus pilipes
                                             Ascorhynchus prosus
                                             Ascorhynchus pudicus
                                             Ascorhynchus pyrginospinum
                                             Ascorhynchus pyriginospinus
                                             Ascorhynchus ramipes
                                             Ascorhynchus serratus
                                             Ascorhynchus seticauda
                                             Ascorhynchus simile
                                             Ascorhynchus simplex
                                             Ascorhynchus somaliensis
                                             Ascorhynchus stocki
                                             Ascorhynchus tenuirostris
                                             Ascorhynchus tuberosus
                                             Ascorhynchus turritus
                                             Ascorhynchus utinomii
                                             Ascorhynchus verrucosus
                                     Austroraptus
                                             Austroraptus calcaratus
                                             Austroraptus juvenilis
                                             Austroraptus polaris
                                             Austroraptus praecox
                                             Austroraptus sicarius
                                     Bathyzetes
                                             Bathyzetes extenuata
                                             Bathyzetes setiger
                                             Bathyzetes virago
                                     Biammothea
                                             Biammothea brevipalpa
                                     Boehmia
                                             Boehmia chelata
                                             Boehmia dubia
                                             Boehmia longirostris
                                             Boehmia tuberosa
                                     Calypsopycnon
                                             Calypsopycnon georgiae
                                     Chonothea
                                             Chonothea hians
                                             Chonothea verrucosa
                                     Cilunculus
                                             Cilunculus acanthus
                                             Cilunculus achelioides
                                             Cilunculus alcicornis
                                             Cilunculus antillensis
                                             Cilunculus armatus
                                             Cilunculus ateuchus
                                             Cilunculus australiensis
                                             Cilunculus battenae
                                             Cilunculus bifidus
                                             Cilunculus cactoides
                                             Cilunculus compactus
                                             Cilunculus crinitus
                                             Cilunculus europaeus
                                             Cilunculus frontosus
                                             Cilunculus galeritus
                                             Cilunculus gracilis
                                             Cilunculus haradai
                                             Cilunculus hirsutus
                                             Cilunculus japonica
                                             Cilunculus kravcovi
                                             Cilunculus misesetosus
                                             Cilunculus pedatus
                                             Cilunculus perspicax
                                             Cilunculus profundus
                                             Cilunculus sekiguchii
                                             Cilunculus sewelli
                                             Cilunculus spinicristus
                                             Cilunculus tubicinis
                                     Dromedopycnon
                                             Dromedopycnon acanthus
                                             Dromedopycnon arthritis
                                     Elassorhis
                                             Elassorhis laterospinata
                                     Ephyrogymna
                                             Ephyrogymna circularis
                                     Eurycyde
                                             Eurycyde acanthopus
                                             Eurycyde antarctica
                                             Eurycyde arctica
                                             Eurycyde clitellaria
                                             Eurycyde curvata
                                             Eurycyde depressa
                                             Eurycyde diacantha
                                             Eurycyde flagella
                                             Eurycyde gorda
                                             Eurycyde hispida
                                             Eurycyde longioculata
                                             Eurycyde longisetosa
                                             Eurycyde muricata
                                             Eurycyde platyspina
                                             Eurycyde raphiaster
                                             Eurycyde sertula
                                             Eurycyde setosa
                                             Eurycyde spinosa
                                             Eurycyde unispina
                                     Hedgpethius
                                             Hedgpethius interstitialis
                                             Hedgpethius mamillatus
                                             Hedgpethius tridentatus
                                     Hemichela
                                             Hemichela longiunguis
                                             Hemichela micrasterias
                                     Heterofragilia
                                             Heterofragilia amica
                                             Heterofragilia brevicauda
                                             Heterofragilia fimbriata
                                             Heterofragilia hirsuta
                                             Heterofragilia major
                                     Lecythorhynchus
                                             Lecythorhynchus marginatus
                                     Megarhetus
                                             Megarhetus brevicheliferus
                                     Nymphonella
                                             Nymphonella lambertensis
                                             Nymphonella tapetis
                                     Nymphopsis
                                             Nymphopsis acinacispinatus
                                             Nymphopsis anarthra
                                             Nymphopsis armatus
                                             Nymphopsis bathursti
                                             Nymphopsis curtiscapus
                                             Nymphopsis cuspidata
                                             Nymphopsis dromedaria
                                             Nymphopsis duodorsospinosa
                                             Nymphopsis korotnewi
                                             Nymphopsis melidae
                                             Nymphopsis muscosa
                                             Nymphopsis spinosissima
                                             Nymphopsis varipes
                                     Oorhynchus
                                             Oorhynchus aucklandiae
                                     Paranymphon
                                             Paranymphon filarium
                                             Paranymphon magnidigitum
                                             Paranymphon spinosum
                                     Proboehmia
                                             Proboehmia tubirostris
                                     Prototrygaeus
                                             Prototrygaeus ammothelloides
                                             Prototrygaeus contrarius
                                             Prototrygaeus jordanae
                                     Pycnofragilia
                                             Pycnofragilia hamisetosa
                                     Scipiolus
                                             Scipiolus plumosus
                                             Scipiolus spinosus
                                             Scipiolus validus
                                     Sericosura
                                             Sericosura bifurcata
                                             Sericosura cochleifovea
                                             Sericosura cyrtoma
                                             Sericosura mitrata
                                             Sericosura venticola
                                     Trygaeus
                                             Trygaeus communis