Comparison between Musculus coenobitus (Vaillant, 1865) and Musculus subpictus (Cantraine, 1835) A–F Musculus coenobitus, west of Rosh HaNikra Islands, Israel, HELM project (sample S52_2L): right valve outer (A, D) and inner (B) views, living specimen with byssus (C), sculpture of the posterior (E) and anterior (F) area of the right valve G–K Musculus subpictus, Ashqelon, Israel, HELM project (sample S12_1L): right valve outer (G, I) and inner (H) views, sculpture of the posterior (J) and anterior (K) area. Scale bars: 1 mm (A, B, D, G–I), 2.5 mm (C); 0.5 mm (E, F, J, K).