Arcotheres excussus

Arcotheres excussus (Dai, Feng, Song & Chen, 1980) Pinnotheres obscurus — Pregenzer and Morton 1990: 653 [part], fig. 3C, D. Arcotheres excussus — Ng and Ngo 2022: 276, figs. 4, 5. Taxonomy: Dai et al. (1980), Ng and Ngo (2022). Type: Holotype ñ and paratype ññ HN 5803132 in IZASB (now IZCAS). Type locality: Xincun Bay, Hainan, China. Distribution: Vietnam and East Asia: South China, and Taiwan (Ng and Ngo 2022). Habitat: Intertidal to subtidal; commensal with or parasite of bivalves, including Gafrarium sp. and Marcia hiantina (Lamarck, 1818) (Dai et al. 1980), and Anadara kagoshimensis (Tokunaga, 1906) (Arcidae) (Ng and Ngo 2022); on muddy or sandy substrates. Remarks: Ng and Ngo (2022) examined the types of Pinnotheres excussus and referred the species to Arcotheres Manning, 1993 (sensu Manning 1993b; Ng and Ahyong 2022). See also Remarks under P. obscurus.