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Sphaeromatids (Isopoda, Sphaeromatidae) from New Zealand Fresh and Hypogean Waters, with Description of Bilistra N. Gen. and Three New Species

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Bilistra gen. nov., B. millari n. sp., type species, B. mollicopulans n. sp. and B. cavernicola n. sp. are described from karst areas in the northwest of South Island, New Zealand. Bilistra millari n. sp. occurs mainly in surface waters, while B. mollicopulans and B. cavernicola are stygobiotic and troglomorphic, occurring in cave waters. The genus is related to Benthosphaeroma Bruce, 1994, Neosphaeroma Baker, 1926, and Thermosphaeroma Cole & Bane, 1978, but each of these genera exhibits its own apomorphies, mainly in brood-pouch structure and morphology of pleopods IV-V. Bilistra gen. nov., B. millari n. sp. als Typusart, B. mollicopulans n. sp. und B. cavernicola n. sp. aus Karstgebieten im Nordwesten der Südinsel von Neuseeland werden beschrieben. Bilistra millari n. sp., komt vor allem in oberirdischen Gewässern vor, während B. mollicopulans und B. cavernicola Stygobionten sind, die in Höhlengewässern vorkommen und Troglomorphien aufweisen. Die Gattung ist mit Benthosphaeroma Bruce, 1994, Neosphaeroma Baker, 1926 und Thermosphaeroma Cole & Bane, 1978, verwandt. Jede dieser Gattungen weist jedoch ihre eigenen Apomorphien auf, hauptsächlich in der Struktur des Marsupium und Morphologie der Pleopoden IV-V.


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