taxonID	type	description	language	source
E3B41256544858E48B4587BACEC19531.taxon	description	Figs 3 A – G, 4 A – E, 7, 8 A (Idas sp. OTU- 51 mentioned earlier; Idas sp. ESU D, as mentioned by Lorion et al. (2010 ))	en	Wu, Qiong, Lin, Yi-Tao, Qiu, Jian-Wen, Xu, Mei Yu, Xing, Bing Peng (2025): Two new species of Idas (Bivalvia, Mytilidae) from sunken wood in the East China Sea: description, phylogenetic position and symbionts. Zoosystematics and Evolution 101 (2): 761-778, DOI: 10.3897/zse.101.142007
E3B41256544858E48B4587BACEC19531.taxon	diagnosis	Diagnosis. Adult specimens approximately measure 10 mm in length, resembling the general outline of Idas ghisottii Warén & Carrozza, 1990 from the Mediterranean region. Shells with an H / L ratio of about 0.36 to 0.45, maintaining a consistent overall shape across different sizes, though older individuals are slightly more elongated. Umbo located at approximately the anterior 1 / 7 to 1 / 9 of the shell length. The triangular area, from the posterior margin to the umbo, near the dorsal margin, is covered with bristles that match the external shell surface color. The base of the bristles is triangular in shape.	en	Wu, Qiong, Lin, Yi-Tao, Qiu, Jian-Wen, Xu, Mei Yu, Xing, Bing Peng (2025): Two new species of Idas (Bivalvia, Mytilidae) from sunken wood in the East China Sea: description, phylogenetic position and symbionts. Zoosystematics and Evolution 101 (2): 761-778, DOI: 10.3897/zse.101.142007
E3B41256544858E48B4587BACEC19531.taxon	etymology	Etymology. Since our comparison with DNA barcode data obtained from GenBank indicates this species to be widely distributed in the Western Pacific, the name “ pacificus ” was given to the species.	en	Wu, Qiong, Lin, Yi-Tao, Qiu, Jian-Wen, Xu, Mei Yu, Xing, Bing Peng (2025): Two new species of Idas (Bivalvia, Mytilidae) from sunken wood in the East China Sea: description, phylogenetic position and symbionts. Zoosystematics and Evolution 101 (2): 761-778, DOI: 10.3897/zse.101.142007
AE3CA7D7ED9D5480A8FF8EDE5BA769CC.taxon	description	Figs 3 H – I, 4 F – G	en	Wu, Qiong, Lin, Yi-Tao, Qiu, Jian-Wen, Xu, Mei Yu, Xing, Bing Peng (2025): Two new species of Idas (Bivalvia, Mytilidae) from sunken wood in the East China Sea: description, phylogenetic position and symbionts. Zoosystematics and Evolution 101 (2): 761-778, DOI: 10.3897/zse.101.142007
AE3CA7D7ED9D5480A8FF8EDE5BA769CC.taxon	diagnosis	Diagnosis. Shells extremely thin, with internal surface color similar to external surface. Dorsal and ventral margins nearly parallel. Bristles short, brown, mainly concentrated along both sides of ridge in posterior triangular area. Shells resemble those of I. iwaotakii, but overall outline more elliptical compared to I. iwaotakii due to more similar anterior and posterior heights.	en	Wu, Qiong, Lin, Yi-Tao, Qiu, Jian-Wen, Xu, Mei Yu, Xing, Bing Peng (2025): Two new species of Idas (Bivalvia, Mytilidae) from sunken wood in the East China Sea: description, phylogenetic position and symbionts. Zoosystematics and Evolution 101 (2): 761-778, DOI: 10.3897/zse.101.142007
AE3CA7D7ED9D5480A8FF8EDE5BA769CC.taxon	etymology	Etymology. The name sinensis – the Latinized form of China, refers to the type locality, within the Chinese EEZ of the East China Sea.	en	Wu, Qiong, Lin, Yi-Tao, Qiu, Jian-Wen, Xu, Mei Yu, Xing, Bing Peng (2025): Two new species of Idas (Bivalvia, Mytilidae) from sunken wood in the East China Sea: description, phylogenetic position and symbionts. Zoosystematics and Evolution 101 (2): 761-778, DOI: 10.3897/zse.101.142007
