(A and B). Spondylus nicobaricus, west of Rosh HaNikra Islands, Israel: (A) left valve outer and (B) inner view. (C) Spondylus nicobaricus, Vavvaru Island, Maldives: left valve outer view. (D) Spondylus spinosus (juvenile), Caesarea, Israel: left valve outer view. (E and F) Spondylus spinosus (juvenile), Caesarea, Israel: (E) left valve outer and (F) inner views. (G and H) Spondylus spinosus (juvenile in ethanol), west of Rosh HaNikra Islands, Israel: (G) left and (H) right valve outer views; note the presence of flattened, orange spines near the ventral margin of the left valve. (I and J) Spondylus spinosus (reddish juvenile in ethanol), west of Rosh HaNikra Islands, Israel: (I) left and (J) right valve outer views. (K) Spondylus (?) nicobaricus (juvenile), Caesarea, Israel: left valve outer view. L. Juvenile specimen of either Spondylus nicobaricus or spinosus (in ethanol) attached to a coralligenous concretion, west of Rosh HaNikra Islands, Israel: left valve outer view. Scale bars: (A–D) 10 mm, (E, F and K) 3 mm, (G and H) 1 mm, (I, J and L) 2 mm.