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Class: GASTROPODA
--- Taxon Tree: CAENOGASTROPODA [Subclass] - LITTORINIMORPHA [Order] - LITTORINOIDEA [Superfamily]
------ Family: POMATIIDAE Newton, 1891 (Land)
--------- SubFamily: RHYTIDOPOMINAE
------------ Genus: Opisthosiphon W.H. Dall, 1905
--------------- Species: Opisthosiphon obtectum C. de la Torre & J. Henderson, 1920 - ID: 1402305013
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------------------ Sub or form: Opisthosiphon obtectum guayosense C. de la Torre & P. Bartsch, 1941 - ID: 5220000944
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------------------ Sub or form: Opisthosiphon obtectum seibaboense C. de la Torre & P. Bartsch, 1941 - ID: 5220000945
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------------------ Sub or form: Opisthosiphon obtectum tenuicostum C. de la Torre & J. Henderson, 1921 - ID: 5220000946
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