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This research confirms Thracia septentrionalis in the Sea of Japan, highlighting its ecological status and taxonomic relationship with Thracia seminuda.
This paper provides first reliable data on the finding of the bivalve mollusc Thracia septentrionalis in the Sea of Japan. A live specimen (L = 24.4 mm) was collected in June 2003 in Peter the Great Bay at a depth of 70 m on medium-grained sand. The data on geographical distribution and ecology of the species in the northern Pacific Ocean are summarized. The validity of Thracia seminuda Scarlato, 1981, previously synonymized with T. septentrionalis, is confirmed. Diagnostic differences between these species are specified and illustrated.
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E. V. Kolpakov (2025) studied this question.
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