toxicyst

toxicyst

[′täk·sə‚sist]
(invertebrate zoology)
A type of trichocyst in Protozoa which may, upon contact, induce paralysis or lysis of the prey.
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During spore discharge, the invasion tube cinematographically resembles an extruding cnidarian nematocyst (Blanquet, 1983), a discharging capsule from a myxosporean spore (Lom and Noble, 1984; El-Matbouli et al., 1992), or a discharging toxicyst from the ciliate Loxophyllum (Hausmann, 1978).
Extrusomes are organelles common to most ciliates and dinoflagellates (Bouck and Sweeney, 1966; Dodge and Greuet, 1987; Gortz, 1988), and also found in some other taxa, that explosively release toxicysts, trichocysts, or nematocysts from the cell surface.