Raphidiophrys contractilis

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Raphidiophrys contractilis
Raphidiophrys contractilis
Scientific classification
Domain:
Eukaryota
Order:
Centrohelida
Family:
Genus:
Species:
R. contractilis
Binomial name
Raphidiophrys contractilis

Raphidiophrys contractilis is a species of freshwater centrohelid.

Discovery

This species was first isolated from a brackish pond in Shukkeien Garden, Naka-ku, Hiroshima City, Japan.[1]

Description

Raphidiophrys contractilis is a spherical organism measuring between 7 and 19 µm in diameter and has several

silica. These scales are oblong, with curved edges and with the surface always facing the cell body.[1]

Feeding behavior

Raphidiophrys contractilis preys on other protists, such as flagellates and ciliates, and captures them with its axopodia. The axopodia contain many organelles called kinetocysts, which are released on the prey's surface and probably have a paralyzing effect.[2] After the prey is attached to the axopodium, the axopodium contracts rapidly, at a velocity of about 1 mm/s, this being the reason for the species being named Raphidiophrys contractilis.[1]

Although R. contractilis is not a colonial species, several individuals can cooperate in the capture of larger prey. In this case, the individuals gather around the prey and fuse into a larger structure with partially joined cytoplasms and build a common food vacuole to ingest and digest the prey organism.[2]

References

External links