A revision of the genus Cheliplana de Beauchamp, 1927 (Rhabdocoela: Schizorhynchia), with the description of six new species Author Gobert, Stefan 0000-0003-1949-9174 Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Universitaire Campus Gebouw D, B- 3590 Diepenbeek, Belgium. & stefan. gobert @ uhasselt. be; https: // orcid. org / 0000 - 0003 - 1949 - 9174 stefan.gobert@uhasselt.be Author Diez, Yander L. 0000-0001-8741-4799 Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Universitaire Campus Gebouw D, B- 3590 Diepenbeek, Belgium. & University of Oriente, Departement of Biology and Geography, Avenida Patricio Lumumba s / n, CP 90500, Santiago de Cuba, Cuba. Beaty Biodiversity Research Centre, Departments of Botany and Zoology, University of British Columbia, 3529 - 6270 University Blvd, Vancouver, BC, V 6 T 1 Z 4 Canada. & yander @ uo. edu. cu; https: // orcid. org / 0000 - 0001 - 8741 - 4799 yander@uo.edu.cu Author Monnens, Marlies 0000-0002-9133-1512 Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Universitaire Campus Gebouw D, B- 3590 Diepenbeek, Belgium. & marlies. monnens @ uhasselt. be; https: // orcid. org / 0000 - 0002 - 9133 - 1512 marlies.monnens@uhasselt.be Author Reygel, Patrick 0000-0001-8721-6290 Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Universitaire Campus Gebouw D, B- 3590 Diepenbeek, Belgium. & patrick. reygel @ uhasselt. be; https: // orcid. org / 0000 - 0001 - 8721 - 6290 patrick.reygel@uhasselt.be Author Van Steenkiste, Niels W. L. 0000-0002-2676-7862 niels. vansteenkiste @ botany. ubc. ca; https: // orcid. org / 0000 - 0002 - 2676 - 7862 niels.vansteenkiste@botany.ubc.ca Author Leander, Brian S. 0000-0003-0798-0470 bleander @ mail. ubc. ca; https: // orcid. org / 0000 - 0003 - 0798 - 0470 bleander@mail.ubc.ca Author Artois, Tom Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Universitaire Campus Gebouw D, B- 3590 Diepenbeek, Belgium. text Zootaxa 2021 2021-05-17 4970 3 453 494 journal article 6258 10.11646/zootaxa.4970.3.2 281c9017-f55b-47bf-bea0-e511a7173605 1175-5326 4766692 FEABE248-E1EA-48F5-A1AF-0077FE40C257 Cheliplana orthocirra Ax, 1959 Material examined. New material. ITALY • 1 whole mount; Sardinia , Asinara National Park , Cala del Bianco ; 41°04’27”N , 8°20’12”E ; 25 Sep. 2014 ; medium-grained sand between Posidonia sp. , at 2.5 m deep; HU X.2.40 . Note. No reference material was available to us at the time of this study. Known distribution . Florya, Sea of Marmara, Turkey ( Ax 1959 ). Southern and Western Sweden ( Atherton & Jondelius 2020 ). Remarks . The proboscis hooks are smooth, fairly straight and ~11 μm long in the specimen from Sardinia . Ax (1959) does not give any measurements except those pertaining to the cirrus. Cheliplana orthocirra has a pair of partially fused testes, positioned on one side of the pharynx. The copulatory bulb is positioned in the posterior half of the body and contains a proximal prostatic vesicle, which connects directly to the distal cirrus. A pair of large, globular seminal vesicles and prostatic glands enter the proximal end of the copulatory bulb. The cirrus is armed with very fine spines over its entire length. These spines decrease in size towards the distal end of the cirrus. A single gonopore and bursa are present near the caudal end of the specimen. In the specimen from Sardinia , the cirrus is 35 μm long, which is significantly shorter than the ~56 μm reported by Ax (1959) . Nevertheless, given the cirrus shape and generally similar internal morphology, we feel confident in ascribing this specimen to C. orthocirra .