: Swan mussels ( Anodonta ), thick-shelled river mussels ( Unio ), and giant clams ( Tridacna ).
: Like most mollusks, they have an open circulatory system where the heart pumps blood into the body cavity. Internal Anatomy Summary Characteristic Digestive gdz biologiia 7 sumatokhin klass dvukhstvorchatye molliuski
: As filter feeders, they clean bodies of water by removing organic suspension. : Swan mussels ( Anodonta ), thick-shelled river
: 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. : The body is laterally compressed and divided
Урок 2: Классы моллюсков - Ростелеком Лицей
(class Bivalvia ) are a unique group of aquatic mollusks characterized by a shell consisting of two hinged valves and, most notably, the absence of a head . In the Grade 7 Biology curriculum by Sumatohin, they are studied as essential bio-filters and members of aquatic ecosystems. Key Biological Features