: Consists of two symmetrical valves connected by a flexible ligament and a "lock" (hinge).
Mouth (near the foot), stomach, liver, and intestine. They lack a radula (grating tongue). Plate-like gills (ctenidia) located in the mantle cavity. Excretory Two kidneys that open into the mantle cavity. Nervous Simplified, consisting of three pairs of ganglia. Ecological and Economic Importance gdz biologiia 7 sumatokhin klass dvukhstvorchatye molliuski
: Swan mussels ( Anodonta ), thick-shelled river mussels ( Unio ), and giant clams ( Tridacna ). : Consists of two symmetrical valves connected by
: The body is laterally compressed and divided into two main parts: the trunk and the wedge-shaped foot . Unlike gastropods, bivalves lack a head, tentacles, and eyes. thick-shelled river mussels ( Unio )
Урок 2: Классы моллюсков - Ростелеком Лицей