Abstract
A new species Tetracyclus chankaicus Dubrovina, Usoltseva, Pushkar & Likhacheva is described from Middle Miocene sediments of the Novokachalinskaya formation on the western coast of Khanka Lake in Primorye, Russian Far East. This species differs from T. clypeus (Ehrenberg) Li by the irregular stria density on the valve face, the absence of secondary ribs at the poles, different girdle band structure and the number of rimoportulae.
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