Meet the Comb Bittersweet!
Tucetona pectinata (Gmelin, 1791) is the most common out of two locally found species of the bittersweet family, the Glycymerididae. Its shell may reach 30 mm (about 1.2 inches), and is circular, with a sculpture of 20–35 relatively wide ribs that are flat in cross-section. As the image above shows, the ribs are overlaid with a microscopic sculpture of regularly spaced, commarginal (“concentric”) threads. The shell hinge (below) has about 20–24 small “teeth” that ensure that