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Penion
''Penion'' is a genus of large sea marine snails, commonly known as siphon whelks, classified within the mollusc family Buccinidae, the true whelks. ==Description== ''Penion'' species are distributed in the Southern Hemisphere. Two extant species are currently classified in Australia〔Ponder, W.F.. 1973. A review of the Australian species of ''Penion'' Fischer (Neogastropoda: Buccinidae). Journal of the Malacological Society of Australia 2: 401–428.〕 and five extant species are documented in New Zealand.〔Powell A. W. B., ''New Zealand Mollusca'', William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1〕 Numerous fossil species are recorded in New Zealand.〔Beu, A.G. and Maxwell, P.A. 1990. Cenozoic Mollusca of New Zealand. New Zealand Geological Survey Bulletin, 58.〕 A molecular phylogeny of Buccinidae based on the complete 16S mitochondrial gene suggested that ''Penion'' is a sister clade to ''Kelletia''.〔Hayashi, S. 2005. The molecular phylogeny of the Buccinidae (Caenogastropoda: Neogastropoda) as inferred from the complete mitochondrial 16s rRNA gene sequences of selected representatives. Molluscan Research, 25: 85–98.〕
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