Beets, C., 1983. Preangerian (Miocene) Mollusca from the lower Sangkulirang Marl Formation, Kari Orang, Kalimantan (East Borneo). Scripta Geologica, 67: 55 -57 .
New Species-Group Names:
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kutaiensis Beets, 1983. p. 55. pl. 4. f. 8-10.
