Hepingdao, Keelung City, 26 Aug 2008: 76 specimens (BD 7.82-32.71 mm) (CEL- BB-119).
Parietes green, with 4 plates, plates tubiferous, base membranous, radii solid. Scutum triangular, occludent margin with fine teeth; tergum broad, higher than wide, apex not produced as a beak, spur sharp, basi scutal angle smaller compared to that of T. squamosa.
Coloration.—Parietes deep-green to green.
BD to 40 mm.
Due to the similar external morphology with T. squamosa, the green-shell Tetraclita from Japan was considered to be T. squamosa in many previous studies. From a molecular DNA sequence analysis, Tetraclita from Japan and Taiwan was proven to be a separate species from T. squamosa, as T. kuroshioensis. The major difference between T. squamosa and T. kuroshioensis is in the shape of the tergum. The tergum of T. squamosa is narrower and with a beak produced at the apex, while that of T. kuroshioensis is broader and the apex is more blunt compared to T. squamosa.
Japan (including Okinawa), Taiwan (Chan et al., 2008b), Palau.