Arcidae belongs to the superfamily within the order Arcoida . It is a highly species-rich family, with a conservative estimate of over 300 extant species worldwide.
: Maximum species diversity occurs in the Indo-West Pacific region, where over 180 valid species in more than 30 genera are recorded. Regional Presence : Tropical West Africa : ~27 species. West Atlantic : ~20 species. Northeastern Atlantic : ~10 species. arcidae
: Though rare, some species are found at abyssal depths and in polar seas. Arcidae belongs to the superfamily within the order Arcoida
: Attached to hard surfaces (rocks, coral) via strong byssal threads . Infaunal : Buried in sand or mud. Economic and Ecological Importance Regional Presence : Tropical West Africa : ~27 species
: 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.
