Thalassomya
Thalassomya is a genus of deep-sea bivalve mollusks in the family Thyasiridae. These small, fragile bivalves are known for their unique morphology and ability to thrive in challenging deep-sea environments. The genus encompasses several species, including Thalassomya tenera, a particularly well-studied species found in the North Atlantic and other regions.
Common Names
Thalassomya species are commonly known as "deep-sea cockles" or "thyasirids".
Characteristics
Thalassomya bivalves are characterized by their small, thin shells with a delicate, translucent appearance. They have a distinctive, nearly circular shape with a slightly flattened ventral margin. The shells often exhibit a smooth, glossy surface, sometimes adorned with faint radial lines or growth rings. The interior of the shell is typically pearly white.
Thalassomya species possess a unique siphon structure, with two long, extensible siphons that allow them to filter food particles from the surrounding water. These siphons can be extended significantly, enabling the bivalves to reach food sources in the sediment or nearby water column.
Environment
Thalassomya species are predominantly found in deep-sea environments, typically inhabiting the continental slope and abyssal plains. They often occur in association with benthic communities, including seamounts, canyons, and hydrothermal vents. These bivalves thrive in environments characterized by low temperatures, high hydrostatic pressure, and limited light penetration.