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Data improving the characterization of the marine Euplotes species, E. petzi Wilbert and Song, 2008, were obtained from morphological, ecological and genetic analyses of Antarctic and Arctic wild-type strains. This species is identified by a minute (mean size, 46 μm × 32 μm) and ellipsoidal cell body which is dorsally decorated with an argyrome of the double-patella type, five dorsal kineties (of which the median one contains 8-10 dikinetids), five sharp-edged longitudinal ridges, and a right anterior spur. Ventrally, it bears 10 fronto-ventral, five transverse, two caudal and two marginal cirri, 30-35 adoral membranelles, and three inconspicuous ridges. Euplotes petzi grows well at 4 °C on green algae, does not produce cysts, undergoes mating under the genetic control of a multiple mating-type system, constitutively secretes water-borne pheromones, and behaves as a psychrophilic microorganism unable to survive at >15 °C. While the α-tubulin gene sequence determination did not provide useful information on the E. petzi molecular phylogeny, the small subunit rRNA (SSU rRNA) gene sequence determination provided solid evidence that E. petzi clusters with E. sinicus Jiang et al., 2010a, into a clade which represents the deepest branch at the base of the Euplotes phylogentic tree., (Copyright © 2014 Elsevier GmbH. All rights reserved.)