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| Actinoptychus kymatodes var. radiolata Forti 1913 |
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| Actinoptychus kymatodes var. tetramera Forti 1913 |
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| Actinoptychus minutus f. major Forti 1913 |
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| Actinoptychus sculptilis var. tetramera Forti 1913 |
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| Actinoptychus sculptilis f. tetramera Forti 1913 |
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| Actinoptychus stella f. fenestrata Forti 1913 |
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| Actinoptychus undulatus var. inaequisculpta Forti 1913 |
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| Actinoptychus undulatus var. labyrinthiformis Forti 1913 |
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| Actinoptychus undulatus var. parallelistriata Forti 1913 |
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| Arachnoidiscus ornatus var. obscurus Forti 1913 |
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| Asterolampra acutiloba Forti 1913 |
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| Asterolampra affinis var. cellulosa Forti 1913 |
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| Aulacodiscus italicus Forti 1913 |
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| Aulacodiscus petersii var. trimera Forti 1913 |
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| Auliscus elegans var. pantocseckii Forti 1913 |
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| Auliscus lóczyi f. major Forti 1913 |
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| Biddulphia acanthoceros Forti 1913 |
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| Biddulphia fortiana Tempère in Forti 1913 |
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| Biddulphia tabellariaeformis Forti 1913 |
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| Biddulphia tuomeyi var. centrospinosa Forti 1913 |
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| Biddulphia tuomeyi var. contorta Forti 1913 |
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| Biddulphia tuomeyi var. distenta Forti 1913 |
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| Biddulphia tuomeyi f. margaritifera (Shadbolt) Forti 1913 |
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| Biddulphia tuomeyi var. media Forti 1913 |
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| Cocconeis lanzii Forti 1913 |
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| Cocconeis praecellens f. ellipticostriata Forti 1913 |
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| Cocconeis praecellens f. paucistriata Forti 1913 |
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| Cocconeis praecellens f. subellipticostriata Forti 1913 |
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| Cocconeis vitrea var. minor Forti 1913 |
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| Coscinodiscus biangulatus var. reducta Forti 1913 |
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| Coscinodiscus denarius var. subtilissima Forti 1913 |
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| Coscinodiscus lewisianus var. minor Tempère in Forti 1913 |
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| Coscinodiscus moronensis var. latilimba Forti 1913 |
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| Coscinodiscus pseudoactinocyclus Forti 1913 |
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| Coscinodiscus rhombicus var. crassipunctata Forti 1913 |
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| Coscinodiscus rhombicus var. lanceolata Forti 1913 |
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| Coscinodiscus symbolophorus var. intactus Forti 1913 |
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| Hyalodiscus radiatus var. parva Forti 1913 |
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| Leudugeria epithemioides (epithemoides) var. brevis (Tempère & Peragallo) Forti 1913 |
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| Leudugeria janischiana Forti 1913 |
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| Leudugeria janischiana var. obtusata Tempère in sched. in Forti 1913 |
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| Leudugeria janischiana var. subarcuata (Tempère in Tempère & Peragallo) Forti 1913 |
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| Lithodesmium ehrenbergii f. quadrigona dicentrica Forti 1913 |
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| Melosira clavigera var. crassiradiata (Forti in Tempère & Peragallo; Forti) Forti 1913 |
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| Melosira ornata var. reducta Forti 1913 |
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| Navicula aemilia Forti 1913 |
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| Navicula hennedyi var. aemilia Forti 1913 |
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| Navicula hennedyi (hennedii) var. brachypleura Forti 1913 |
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| Sceptroneis caduceus (caducea) var. abbreviata Forti 1913 |
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| Stephanogonia polyacantha (Forti) Forti 1913 |
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| Stephanogonia polyacantha var. inermis Forti 1913 |
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| Stephanogonia reticulata Forti 1913 |
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| Stephanopyxis eutycha (Ehrenberg) Forti 1913 |
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| Stephanopyxis grunowii f. monstrosa Forti 1913 |
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| Stictodiscus parallelus var. kinkerianus (Truan & Witt) Forti 1913 |
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| Triceratium cellulosum var. italica (italicum) Forti 1913 |
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| Triceratium exornatum var. gigantea Forti 1913 |
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| Triceratium flos var. intermedia Forti 1913 |
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| Triceratium flos var. italica Forti 1913 |
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| Triceratium latum var. dissimilis (Grunow) Forti 1913 |
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| Triceratium latum var. inglorium (Greville) Forti 1913 |
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| Triceratium stokesianum (stockesianum) f. anomala Forti 1913 |
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| Triceratium subcapitatum var. spinosa Forti 1913 |
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| Triceratium subrotundatum f. italica Forti 1913 |
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| Triceratium trisulcum var. miocenica Forti 1913 |
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| Triceratium wittii f. quadrata major Forti 1913 |
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| Triceratium wittii f. trigona Forti 1913 |
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| Xanthiopyxis biscoctiformis Forti 1913 |
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| Xanthiopyxis hystrix Forti 1913 |
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| Xanthiopyxis panduraeformis var. soleiformis Forti 1913 |
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