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Abstract
The detailed study of general features and rib structure on numerous specimens of the subfamily Trachycardiinae from the Indo-West Pacific, generally identified as Acrosterigma elongatum, A. enode, A. serricostatum, A. okinawaense and A. wilsoni, and comparison between them, shows that they are conspecific and belong to a polytypic species: Acrosterigma elongatum (Bruguière, 1789). Although there are numerous intermediate forms, six geographically distinct subspecies can be defined.