Adna

Adna is a genus of deep-sea, stalked barnacles (family Scalpellidae). These barnacles are characterized by their elongated, cylindrical bodies with a long, flexible peduncle. Their shells, or carinae, are typically thin and fragile, composed of a series of overlapping plates. Adna species are found in various marine environments, primarily in the deep sea, where they attach to hard substrates such as rocks, coral, and other marine organisms.

Barnacle – Adna anglica

Common Names

Adna species are often referred to as "stalked barnacles" or "goose barnacles" due to their elongated peduncle and resemblance to the neck of a goose. However, specific common names for individual Adna species are rarely used.

Characteristics

Adna barnacles possess several distinct characteristics:

  • Elongated, cylindrical body: The body is often described as elongated and cylindrical, with a long, flexible peduncle.
  • Thin and fragile shell: The shell, composed of a series of overlapping plates called carinae, is typically thin and fragile.
  • Deep-sea habitat: Adna species are primarily found in deep-sea environments, often at depths exceeding 1,000 meters.
  • Sessile lifestyle: Like other barnacles, Adna species are sessile, meaning they attach to a substrate and remain in one place for their entire life.
  • Filter feeders: Adna barnacles are filter feeders, capturing small organisms and particles from the surrounding water using their cirri, hair-like appendages located around their mouths.

Environments

Adna barnacles are primarily found in deep-sea environments, where they attach to hard substrates such as rocks, coral, and other marine organisms. Some species may also be found in shallower waters. Their ability to withstand the harsh conditions of the deep sea, including high pressure, low temperatures, and limited food availability, has contributed to their successful adaptation to this environment.

References

For further information on Adna species, refer to the following reliable sources: