Rhabdostyla arenaria (Cuénot 1891) — Fig. 1, E [Rhabdostyla] (Rhabdostyla) arenaria Cuénot, 1891—Kahl, 1935: 678, pl. 129, fig. 25 Diagnosis: Size about 40–56µm. Short peduncle, 10µm in length, reaching the size of the body in some cases. Posterior section of the body interrupted by a transverse groove, which has been considered to be part of the peduncle. Very long infundibulum. Contractile vacuole wide with a very distinct excretory canaliculus. Elongated and bandshaped macronucleus, with small chromatin agglomerations. Found living on the integument of echinoderms. Remarks: diagnosis compiled from Cuénot (1891), Hensen (1911) and Kahl (1935). Cuénot (1891) points to the possibility of a spherical micronucleus in the upper part of the body. (Cuenot, 1891)

Souza, Pedro Mendes De, Rossi, Mariana Fonseca & Dias, Roberto Júnio Pedroso, 2024, Systematic review of the genera Rhabdostyla Kent 1880 and Orborhabdostyla Foissner et al. 2010 (Ciliophora, Peritrichia, Epistylididae), Zootaxa 5399 (3), pp. 201-230 : 211

Rhabdostyla arenaria (Cuénot 1891) — Fig. 1, E [Rhabdostyla] (Rhabdostyla) arenaria Cuénot, 1891—Kahl, 1935: 678, pl. 129, fig. 25 Diagnosis: Size about 40–56µm. Short peduncle, 10µm in length, reaching the size of the body in some cases. Posterior section of the body interrupted by a transverse groove, which has been considered to be part of the peduncle. Very long infundibulum. Contractile vacuole wide with a very distinct excretory canaliculus. Elongated and bandshaped macronucleus, with small chromatin agglomerations. Found living on the integument of echinoderms. Remarks: diagnosis compiled from Cuénot (1891), Hensen (1911) and Kahl (1935). Cuénot (1891) points to the possibility of a spherical micronucleus in the upper part of the body.