Rhabdostyla dixae ( Nenninger 1948 )

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 : 215

Rhabdostyla dixae ( Nenninger 1948)

— Fig. 2 , N

Epistylis (Rhabdostyla) dixae Stiller, 1933 — Stiller, 1971: 65, pl. 35, fig. I

Diagnosis: Size about 48.8–55 µm. Jar-like body, strongly protruding in the frontal third. Small stalk, about 10–11 µm to a third of the body size, quite thin. Peristomial collar with two-thirds of the body width, simple, collar-like, notched. Peristomial disc wide and arched, with a pronounced annular groove at the base. Infundibulum reaching about a third of the body’s length, which widens to a spherical shape in the lower portion. Contractile vacuole positioned at the lower left end of the infundibulum. Pellicle streaked at regular intervals. The basal part of the body with two lobes, one lobe slightly longer than the other. Macronucleus tape-shaped with folds at the ends, positioned transversely in the anterior part of the body, covering the lower end of the infundibulum, or obliquely reaching the peristomial disc. Found in freshwater environments on insect larvae of the species Dixa nigra .

Remarks: diagnosis compiled from Nenninger (1948) and Stiller (1971). According to Nenninger (1948), the contraction creates a narrow, notched collar and the pellicle striations become more apparent.

Figures

FIGURE 2. Schematic drawing of representatives of the Rhabdostyla genus. K: Rhabdostyla conipes; L: Rhabdostyla cyclopis, M: Rhabdostyla cylindrica; N: Rhabdostyla dixae; O: Rhabdostyla dubia; P: Rhabdostyla ephemerae; Q: Rhabdostyla fromentellii; R: Rhabdostyla globularis; S: Rhabdostyla hungarica.