“…Based on the definition of the six mitochondrial lineages, the primary A. pectinata lineages in Japanese waters are L1 and L2 (we refer to the lineages as mt‐L1 and mt‐L2), which correspond to the nonscaly and scaly forms of A. pectinata , respectively (Hashimoto et al, 2018, 2021). We treat hereafter the two lineages as different species, presuming that the lineage mt‐L1 represents Atrina japonica (Reeve, 1858), and the lineage mt‐L2, Atrina lischkeana (Clessin, 1891), according to suggestions by many authors (Huber, 2010; Japanese Association of Benthology, 2012; Kurozumi, 2017; Schultz & Huber, 2013; Xue et al, 2021). Both A. japonica and A. lischkeana typically occur in inner bays (low tidal zones to the depth of 30 m; Japanese Association of Benthology, 2012), but A. japonica is found in higher latitudes than is A. lischkeana with some exceptions (Hashimoto et al, 2021; Liu et al, 2011; Xue et al, 2021).…”