Figure 2 in The biology and functional morphology of the high-energy beach dwelling Paphies elongata (Bivalvia: Mactroidea: Mesodesmatidae). Convergence with the surf clams (Donax: Tellinoidea: Donacidae)

Figure 2. Paphies elongata. (a) Lateral and (b) posterior views of the left shell valve. Also illustrated in (c) and (d) are the same views of Donax columbella drawn to approximately the same scale. a–b, the dorsoventral axis of the shell; x–y, the greatest shell width; small arrow indicates the position of the umbones; the angles suggest that the posterior face of the shell of P. elongata is slightly more elongate than in D. columbella. L, ligament of D. columbella.