Arcidae

Complete mitochondrial genome of Anadara vellicata (Bivalvia

: Though rare, some species are found at abyssal depths and in polar seas.

: Unlike most mollusks, Arcidae often contain hemoglobin in their hemocoel, giving them a red-colored body and the name "blood cockles". This adaptation may aid survival in low-oxygen environments like mud. arcidae

: A long, straight hinge line with numerous small teeth.

: Common genera include Anadara (often called blood cockles due to the presence of hemoglobin), Arca , and Barbatia . Morphological and Biological Characteristics : A long, straight hinge line with numerous small teeth

Ark shells are distinguished by several unique biological features that allow them to thrive in varied benthic environments:

: Many species possess numerous small pallial eyes along their mantle margin, particularly on the posterior side, providing light sensitivity. Lifestyles : They exhibit two main ecological habits: Lifestyles : They exhibit two main ecological habits:

: Attached to hard surfaces (rocks, coral) via strong byssal threads . Infaunal : Buried in sand or mud. Economic and Ecological Importance