Abstract
We described the infraciliature of Opisthotrichum janus, Epidinium ecaudatum, and Ophryoscolex purkynjei, belonging to the family Ophryoscolecidae, from pyridinated silver carbonate impregnated specimens. The adoral polybrachykinety is C-shaped in Opi. janus, whereas it is spiral-shaped in Epi. ecaudatum and Oph. purkynjei. The vestibular polybrachykinety is slender and short in Opi. janus, whereas slender and long in Epi. ecaudatum and Oph. purkynjei. The paralabial kineties are composed of several short kineties along the adoral polybrachykinety. The dorsal polybrachykinety is displaced posteriorly. This study provides information on the diagnostic features of the subfamily Ophryoscolecinae to which Opi. janus, Epi. ecaudatum, and Oph. purkynjei belong. A C-shaped or spiral-shaped adoral polybrachykinety and slender vestibular polybrachykinety are the diagnostic features of the subfamily Ophryoscolecinae in addition to their general features of a cylindrical body, tubular vestibulum, dorsal ciliary zone considerably displaced posteriorly, well developed skeletal plates, and macronucleus beneath the right body surface. Opi. janus, Epi. ecaudatum, and Oph. purkynjei show the basic form of morphogenesis of the ciliature, similar to that in the subfamily Diplodiniinae, with four primordia developing into the oral and dorsal ciliature.
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