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Distribution of Retropinna semoni.
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Retropinna tasmanica, sp. nov.. Holotype, 67 mm. long, from the Huon River, Tasmania
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Retropinna retropinna. Cotype
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Retropinna semoni, Weber. A specimen 41 mm. long, from Ithaca Creek, Brisbane
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Retropinna retropinna.
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Retropinna semoni, Weber. A specimen 55 mm. long, from Sackville, Hawkesbury River, New South Wales
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Retropinna semoni.