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Peristichia
''Peristichia'' is a genus of sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2010). ''Peristichia''. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=415795 on 31 January 2012〕 ==Taxonomy== In his original paper, Dall proposed ''Peristichia'' as a genus of dubious affinities and placed it later in the family Pyramidellidae. Paul Bartsch, his collaborator, later thought it was a subgenus of ''Turbonilla''.〔P. Bartsch (1904), Proc. Biol. Soc. Washington, vol. 17. p. 9〕 Johannes Thiele does not even mention this genus in his ''Handbuch der Systematischen Weichtierkunde''. (1929). Wilhelm August Wenz in his ''Handbuch der Paläozoologie, Band 6, Gastropoda'', also thought it was probably a subgenus of ''Turbonilla'', but added a question mark. However, a close examination shows that it belongs in the family Pyramidellidae, close to ''Tryptichus'' Mörch, 1875, differing from it only in having one (instead of two) basal entral spiral cords and having no columellar fold.
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