Limnoterrestrial ‘ Typhloplanidae’ (Rhabdocoela, Platyhelminthes), with the description of four new species and a new genus Author Houben, Albrecht M. 47A2BBE9-0820-4E83-B8BD-B41A66C214ED Biodiversity & Toxicology, Agoralaan Gebouw D, B- 3590 Diepenbeek, Belgium. albrecht.houben@gmail.com Author Monnens, Marlies 782F71E0-EF84-48DA-BE72-8E205CB78EAC Biodiversity & Toxicology, Agoralaan Gebouw D, B- 3590 Diepenbeek, Belgium. marlies.monnens@uhasselt.be Author Proesmans, Willem 41B81434-06EE-4BD0-8DCE-4DE73F2A6B30 Agroécologie, INRAE, 17 Rue Sully, F- 21065 Dijon, France. willem.proesmans@gmail.com Author Artois, Tom J. 2EDDE35C-A2F0-4CA2-84AA-2A7893C40AC4 Biodiversity & Toxicology, Agoralaan Gebouw D, B- 3590 Diepenbeek, Belgium. tom.artois@uhasselt.be text European Journal of Taxonomy 2022 2022-03-01 798 70 102 http://dx.doi.org/10.5852/ejt.2022.798.1671 journal article 20416 10.5852/ejt.2022.798.1671 dc185c1a-2bc2-48f1-bbdd-e0ae42f852f1 2118-9773 6323040 F136E044-62C8-4FB3-8160-7DAE663D9600 Adenocerca minima Kolasa, 1981 Fig. 4 Material examined AUSTRIA • 3 specs , studied alive, one of which whole mounted and a second one horizontally sectioned; south of Graz, between Glashütten and Trahütten ; 46°49′46″ N , 15°06′09″ E ; 23 Aug. 2011 ; A.M. Houben and W. Proesmans leg.; humid moss from a small stream in a pine forest ; XIV.2.38 and XIV.3.18 ; HU . Description and discussion Specimens are about 0.6 mm long. Habitus and internal organisation correspond to the description of Kolasa (1981b) . However, the original description, based on one specimen , mentions a much smaller animal ( 0.3 mm ) (see Kolasa 1981b ). Small dermal rhabdites are present all over the body. Protonephridiopores ( Fig. 4A : pp) are situated lateral to the pharynx ( Fig. 4A–B : ph). The two small testes ( Fig. 4A–B : t) are situated caudally from the pharynx, at 65–70% of the body. Adenocerca minima clearly differs from all other representatives of Adenocerca by the orientation of the spines of its copulatory organ (see Fig. 4C–F ). Small spines are present in the distal half of the cirrus and at the distal end, where 6 µm long, distally pointing, crescent-shaped spines form a crown ( Fig. 4C : cs). Other species only possess small spines ( A. clinopharynx Reisinger, 1924 and A. teshirogii ) or have a different orientation of these spines, with the proximal spines being the biggest ( A. bresslaui Reisinger, 1924 ). Remarks Kolasa (1981b) mentioned seven crown spines while we only counted six. Both Kolasa’s and our counts were made on a single specimen. Therefore, for the time being, we prefer to designate our specimens to the same species as Kolasa’s (1981b) . Previously known distribution In wet mosses on the banks of the stream Fosso Contesora, Italy ( Kolasa 1981b ).