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Reference.org
Peritrich
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<p>The peritrichs are a large and distinctive group of <a href="/facts/Ciliate/UREaeHEc">ciliates</a>. </p><p>The peritrichs were first defined by <a href="/facts/Friedrich_von_Stein/BVR6wWd6">Friedrich von Stein</a> in 1859. Initially they were considered <a href="/facts/Spirotrich/nkNmNDmv">spirotrichs</a>, then treated as a separate category, before receiving their modern placement. </p>