Anneissia

Anneissia is a genus of polychaete worms belonging to the family Pectinariidae. These marine invertebrates are characterized by their unique tube-dwelling habits and specialized feeding structures. The genus encompasses a small number of species, each with its own distinct features and distribution patterns. Their body is segmented, typically with a distinct head and a segmented thorax and abdomen. They are commonly referred to as “fan worms” due to their fan-shaped feeding appendages.

Bennett’s Feather Star – Anneissia bennetti

Common Names

Species within the genus Anneissia are commonly known as fan worms or "pectinarians" due to their fan-shaped feeding appendages.

Characteristics

Members of the genus Anneissia exhibit several distinct characteristics:

  • Tube-dwelling: These worms construct tubes from sand grains, mucus, and other materials, providing protection and a stable habitat.
  • Fan-shaped feeding appendages: Anneissia species possess a pair of large, fan-shaped structures called "palps" or "tentacles" used for filtering food particles from the water.
  • Segmented body: The worm's body is divided into distinct segments, with each segment bearing a pair of parapodia (fleshy, paddle-like appendages).
  • Small size: Most Anneissia species are relatively small, typically measuring a few centimeters in length.

Environments

Anneissia species are found in a variety of marine environments, including:

  • Intertidal zones: These worms are commonly found in areas that are periodically exposed to air and water.
  • Subtidal zones: Some species may inhabit deeper waters, typically on sandy or muddy bottoms.
  • Estuaries: Anneissia species are adapted to environments with fluctuating salinity levels.

References

For further information on the genus Anneissia, please refer to the following resources: