Cheliplana uruguayensis Van Steenkiste, Volonterio, Schockaert & Artois 2008

Cheliplana uruguayensis Van Steenkiste, Volonterio, Schockaert & Artois, 2008 Material examined. 2 whole mounts, including the holotype (HU IV.1.33; SMNH Type 7497) and 4 serially sectioned specimens (HU IV.1.34–IV.1.37) Known distribution. La Coronilla, Departamento de Rocha, Uruguay (Van Steenkiste et al. 2008). Remarks. Our observations and measurements correspond to those of Van Steenkiste et al. (2008). Van Steenkiste et al. (2008) report a maximum body length of 0.8 mm. A single testis is situated ventrally from the cylindrical pharynx. A pair of vasa deferentia connects the testis to the posterior body region, where the copulatory system is located. One vas deferens is thin-walled and widens distally to form a seminal vesicle; the other vas deferens is enlarged and surrounded by strong longitudinal muscles. The seminal vesicle and modified vas deferens enter the proximal end of the copulatory bulb together. The copulatory bulb consists of a proximal prostate vesicle, the ejaculatory duct and a very short, tubular stylet of ~11 μm long. The gonopore is situated in the caudal part of the body, at about 4/5 of the body length. The dorsally positioned ovary merges with a vitellarium, essentially forming an ovovitellarium. Bursal tissue connects the bursa to the ovary. A separate spermatic duct is absent. The bursa leads to a vagina externa with a thick, sclerotised wall. Where the vagina connects to the bursa, an elliptical seminal vesicle surrounded by circular muscles is present. The vaginal opening is situated anterior to the gonopore.
Published as part of Gobert, Stefan, Diez, Yander L., Monnens, Marlies, Reygel, Patrick, Van Steenkiste, Niels W. L., Leander, Brian S. & Artois, Tom, 2021, A revision of the genus Cheliplana de Beauchamp, 1927 (Rhabdocoela: Schizorhynchia), with the description of six new species, pp. 453-494 in Zootaxa 4970 (3) on pages 484-485, DOI: 10.11646/zootaxa.4970.3.2, http://zenodo.org/record/4766692
{"references":["Van Steenkiste, N., Volonterio, O., Schockaert, E. & Artois, T. (2008) Marine Rhabdocoela (Platyhelminthes, Rhabditophora) from Uruguay, with the description of eight new species and two new genera. Zootaxa, 1914 (1), 1 - 33. https: // doi. org / 10.11646 / zootaxa. 1914.1.1"]}