1887

Abstract

Morphology of the urostylid ciliate Stokes, 1886, the type of Stokes, 1886, is investigated based on live and protargol-impregnated specimens from a Brazilian population. The absence of transverse cirri, which has been considered the main diagnostic feature of , separating it from Borror, 1972, was found to vary within the studied population, with 50 % of the specimens exhibiting inconspicuous and/or rudimentary transverse cirri. A redefinition of was possible based on combined features of interphase and divisional morphogenesis: Retroextendia Berger, 2006, with bi- or multicoronal frontal cirral pattern; fronto-terminal cirri present; multiple left and right marginal cirral rows that replicate independently via within-row development, each parental row producing one primordium per divider; caudal cirri lacking; and presence/absence of transverse cirri may be intrapopulationally variable. Phylogenetic analyses of the 18S rDNA marker unambiguously placed as sister group of Foissner, 1987, which is herein transferred to as comb. nov.

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2012-01-01
2019-12-13
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