title: Description of a mirror-image doublet from a Brazilian strain of Gastrostyla setifera (Engelmann, 1862) Kent, 1882 (Ciliophora: Stichotrichia).
abstract: The present work describes a mirror-image doublet morph found in a Brazilian strain of the stichotrich ciliate Gastrostyla setifera (Engelmann, 1862) Kent, 1882, obtained from a sample of water and sediment from an urban freshwater stream in the city of Juiz de Fora (Minas Gerais, Brazil). The doublet measured 63 x 49 microm, and had two components where the right one has upside-down arranged adoral membranelles with a set of small oblique membranelles at its proximal (posterior) end. The fronto-ventral-transverse ciliature comprised 34 cirri, mostly related to the left component, as well as two marginal rows. On the dorsal surface there were eight dorsal kineties and six caudal cirri. Dorsomarginal kineties were lacking. The macronucleus comprised one irregular-shaped transverse nodule and two smaller roughly ellipsoid longitudinal nodules.
authors.affiliation: Laboratório de Protozoologia, Programa de Pós-graduação em Ciências Biológicas - Comportamento e Biologia Animal, Universidade Federal de Juiz de Fora - UFJF, CEP 36036-900 Cidade Universitária, Juiz de Fora, MG, Brazil. rjuniodias@hotmail.com
authors.forename: Roberto Júnio Pedroso
authors.initials: RJ
authors.lastname: Dias
authors.forename: Thiago
authors.initials: T
authors.lastname: da Silva Paiva
authors.forename: Inácio Domingos
authors.initials: ID
authors.lastname: da Silva-Neto
authors.forename: Marta
authors.initials: M
authors.lastname: D'Agosto
mesh_terms: D000818:Animals; D001938:Brazil; D016798:Ciliophora / Q000145:classification* / Q000254:growth & development / Q000302:isolation & purification / Q000648:ultrastructure*; D019015:Geologic Sediments / Q000469:parasitology*; D045483:Rivers / Q000469:parasitology*