A new species of Japanese Chama (Bivalvia: Heterodonta) with a calcitic outermost layer
2005
Hamada, N.(Kumamoto Univ. (Japan)) | Matsukuma, A.
4040 A new species of the Chamidae from Japan is described under the name of Chama cerinorhodon n. sp. Chama cerinorhodon has hitherto been misidentified as Chama fragum Reeve, 1846, from its superficial morphological characters. However, it is here revealed that this species is sufficiently distinct from true C. fragum in shell mineralogy and shell structure to warrant separate status. Chama cerinorhodon has a calcitic outermost shell layer in addition to aragonitic inner and median shell layers, whereas C. fragum has only aragonitic inner and outer shell layers. Chama cerinorhodon is closely related to the eastern Pacific species Chama arcana Bernard, 1976, and Chama pellucida Broderip, 1835, in shell morphology, mineralogy, and structure.
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