Moch. Affandi, .- and Sucipto Hariyanto, .- and Agoes Soegianto, .- (2017) The Distinctive Character of Shell Morphology Rectidens sumatrensis (DUNKER, 1852) Against Elongaria orientalis (LEA, 1840) (Two Local species, Bivalvia: Unionidae) from the Brantas River, Indonesia. In: 6th International Conference and Workshops on Basic and Applied Sciences. AIP Publishing, Erbil, Kurdistan Iraq.

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Abstract

Abstract. This research is directed to recognize the main characters of shell morphology that can easily be used to distinguish the two local species of Bivalia Unionidae in the Brantas River in East Java (Indonesia) which are very similar, namely Rectidens sumatrensis and Elongaria orientalis. A total of 49 individuals sampled specimens of both species were characterized based on identification guide Jutting (1953). About of 30 of shell morphological characters were observed, there are three characters identified in specimens Rectidens sumatrensis that can be used to distinguish from the specimen Elongaria orientalis, namely the presence of wrinkles noticeable on the surface structure of the interior of the shell; anteriorly of the greatest diameter of the shell, there is generally a shallow concavity in the flanks; and the two cardinal teeth in each valve shells left and right are relatively undeveloped.

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