Rhabdostyla sessilis Penard 1922

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 : 222

Rhabdostyla sessilis Penard 1922

— Fig. 4 , l’

[ Rhabdostyla] (Rhabdostyla) sessilis Penard, 1922 — Kahl, 1935: 677, pl. 129, fig. 3

Epistylis (Rhabdostyla) sessilis Penard, 1922 — Stiller, 1971: 65, pl. 34, fig. B

Diagnosis: Size about 43–45µm. Body elongated, cylindrical or vaguely urceolate, with a more rounded back. Extremely short peduncle, almost invisible, apparently consisting only of the adhesive disk. Pellicle with very thin and indistinct striations. Relatively wide peristomial disc, very low, with an almost flat surface. Large and deep infundibulum, reaching the middle of the body. Very large contractile vacuole, positioned just below the vestibule. Very light macronucleus, longitudinally positioned, sausage-shaped and strongly thickened at its posterior end. Individuals found on Cyclops copepods.

Remarks: diagnosis compiled from the works of Penard (1922), Kahl (1935) and Stiller (1971).

Figures

FIGURE 4. Schematic drawing of representatives of the Rhabdostyla genus. F’: Rhabdostyla porculus: G’: Rhabdostyla pristinis; H’: Rhabdostyla ringens; I’: Rhabdostyla similis; J’: Rhabdostyla scyphidiformis; K’: Rhabdostyla scyphoides; L’: Rhabdostyla sessilis; M’: Rhabdostyla spheroides; N’: Rhabdostyla taboadai; O’: Rhabdostyla tritora; P’: Rhabdostyla tubificis; Q’: Rhabdostyla vernalis.