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New data on the genus Diadeloplax Hoare and Mapes, 1995
Published online by Cambridge University Press: 20 May 2016
Extract
Calyptraea antiqua Howse (1848, 1858), based upon a plate from the Permian of England, was included in the Polyplacophora. King (1850) questioned this assignment since Calyptraea is a gastropod. Kirkby (1859) placed C. antiquus (Howse) in the genus Chitonellus Lamarck, 1819 and described two new species from the Permian of England, C. hancockianus and C. distortus. Kirkby and Young (1867) described another taxon, C. subantiquus, from the Carboniferous of Scotland. Branson (1948) questioned the assignment of these species to the Polyplacophora. Smith and Hoare (1987) rejected them from the class. Kirkby also included other specimens in Chitonellus; these are now assigned to the polyplacophoran Glyptochiton deKoninck, 1883. Geinitz (1861) followed the assignment of Kirkby and recognized three species using Kirkby's (1859) illustrations.
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