Egg-shaped ciliate
Tiarina fusus
Tiarina fusus is a marine ciliate characterized by its egg-shaped to spindle-shaped body. The cell is covered by a firm pellicle with plate-like structures arranged in longitudinal and transverse rows. It moves through the water with a rotating motion and serves as an important component of the microbial food web in oceans and brackish water environments.
Details
Identification
Egg-shaped to spindle-shaped body; pellicle with distinct longitudinal and transverse ridges (plate pattern); apical oral region; rotating swimming pattern.
Social behavior
Lives as a solitary organism in the pelagic zone of the seas.
Diet
Feeds predatorily on other unicellular organisms, with a particular preference for dinoflagellates.
Hunting strategy
Raptorial predator that detects its prey through direct contact and engulfs it using specialized cellular structures.
Overwintering
Survival through cyst formation or reduction of metabolic activity at low temperatures.
Ecology
Ecological role
Important trophic link between primary production of phytoplankton and larger consumers.
Natural predators
Larger zooplankton such as copepods as well as larvae of fish and crustaceans.
Competitor species
Other heterotrophic ciliates and predatory dinoflagellates in the same habitat.
Ecosystem service
Regulation of algal populations and contribution to the marine nutrient cycle.
Threats
Changes in salinity, eutrophication of coastal waters, and ocean warming.
Scientific profile
Profile
Habitat
Marine pelagic zones; widely distributed in coastal waters, estuaries, and shelf seas worldwide (e.g., North Sea, Baltic Sea, North Atlantic, Mediterranean).
Reproduction
Asexual reproduction via binary transverse fission.
Ecological role
Important regulator of phytoplankton populations within the microbial loop. Tiarina fusus can control dinoflagellate blooms through selective grazing and is capable of engulfing prey nearly reaching its own body size.