Validation of lateral visibility of the ligament as a characteristic for fast discrimination between juveniles of Cerastoderma edule and C. glaucum (Mollusca, Bivalvia).
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Many different methods have been used to differentiate Cerastoderma edule (L., 1758) from C. glaucum (Bruguière,1789). However, very few of them are fast and valid for specimens less than 10 – 12 mm length. Although the lateral visibility of the ligament has been described as a discriminating trait, it is seldom used despite the fact that it can be applied immediately. To determine the validity of this characteristic at the juvenile stage, a group of specimens from both species was identified using both this and other methods based on the relationships between different valve sizes. In all of the specimens identified with these methods as C. glaucum, the ligament could not be detected in lateral view and vice versa, whereas the contrary is true for C. edule.
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