Trichocysts

It reminds me very much of the time when I saw a paramecium use its trichocysts against another organism, back many years ago when I was a bio major. ❋ Unknown (2010)

Reddish granular pigment and trichocysts are occasionally present. ❋ Unknown (1906)

The body is usually covered uniformly with trichocysts, often of considerable size. ❋ Unknown (1906)

In many cases trichocysts are uniformly distributed. ❋ Unknown (1906)

The body is uniformly covered with fine cilia, and the periphery is uniformly studded with large trichocysts, except along the furrow. ❋ Unknown (1906)

The right side is flattened and alone provided with cilia, while the left side of the body proper is arched; on the left side of the proboscis is a row of coarse cilia resembling an adoral zone, and a row of trichocysts. ❋ Unknown (1906)

The cortical plasm contains peculiar rod-like bodies, which look more like lines or markings than like rods or trichocysts. ❋ Unknown (1906)

Its color is yellowish brown from the presence of brilliant particles of coloring matter held in the cortical plasm, and, as it slowly rolls along, these particles and the black trichocysts give to the organism a peculiar sparkling effect. ❋ Unknown (1906)

On the right edge is a small, longitudinally striped tract which is free from trichocysts and smooth in appearance. ❋ Unknown (1906)

The cuticle is firm and unyielding and marked by longitudinal and somewhat spiral rows of cilia and trichocysts. ❋ Unknown (1906)

As the baby grows, the trichocysts develop into hair follicles which produce short downy hairs after the child's birth. ❋ Unknown (2010)

Hair growth begins in the womb with the formation of trichocysts three months after conception. ❋ Unknown (2010)

The trichocysts are only ejected when it bumps into something it's interested in eating.

Paramecium, injecting trichocysts into its prey when it bumps into it.