Systematic review of the genera Rhabdostyla Kent 1880 and Orborhabdostyla Foissner et al. 2010 (Ciliophora, Peritrichia, Epistylididae) Author Souza, Pedro Mendes De ¹ Laboratório de Protozoologia, Programa de Pós-Graduação em Biodiversidade e Conservação da Natureza, Universidade Federal de Juiz de Fora, Martelos, 36036 - 900, Juiz de Fora, Brazil Author Rossi, Mariana Fonseca ¹ Laboratório de Protozoologia, Programa de Pós-Graduação em Biodiversidade e Conservação da Natureza, Universidade Federal de Juiz de Fora, Martelos, 36036 - 900, Juiz de Fora, Brazil Author Dias, Roberto Júnio Pedroso ¹ Laboratório de Protozoologia, Programa de Pós-Graduação em Biodiversidade e Conservação da Natureza, Universidade Federal de Juiz de Fora, Martelos, 36036 - 900, Juiz de Fora, Brazil text Zootaxa 2024 2024-01-12 5399 3 201 230 http://dx.doi.org/10.11646/zootaxa.5399.3.1 journal article 10.11646/zootaxa.5399.3.1 1175-5326 10516774 2134D857-542C-40A6-9557-CB8E042E4271 Rhabdostyla annulata ( Stokes 1886 ) nov. comb. — Fig. 1 , D Opisthostyla annulata Stokes, 1886 (b): 565, fig. 12, 13. [ Rhabdostyla ] ( Opisthostyla ) annulata Stokes,1886 — Kahl, 1935: 679 , pl. 129. Fig. 20 Epistylis ( Rhabdostyla ) annulata Stokes, 1886 — Stiller, 1971: 70 , pl. 36, fig. 6 Diagnosis: Size about 22–35 µm. Conical body, less than twice long as wide. Slightly changeable in shape, somewhat bumpy or with almost straight side margins. Zooid located obliquely or vertically over the peduncle, which has the same size as the body and a slight curve in the distal portion. Pellicle strongly transversely striated. Revoluted peristomial collar, with ciliary circles. Infundibulum reaches a third of the body’s length. Contractile vacuole found on the right margin of the infundibulum in the upper quarter of the body. Macronucleus, thin and horseshoe-shaped, located in the middle of the body, positioned horizontally. Found in freshwater lakes living on algae. Remarks: diagnosis compiled from Stokes (1886) , Kahl (1935) and Stiller (1971) .