The present state of the leech fauna (Annelida: Hirudinea) in Lithuania Author Šatkauskienė, Ingrida Department of Biology, Faculty of Natural Sciences, Vytautas Magnus University, Universiteto g. 10, 53361 Kaunas, Lithuania Author Rutkauskaitė-Sucilienė, Jurgita 0000-0003-4712-1865 Department of Biology, Faculty of Natural Sciences, Vytautas Magnus University, Universiteto g. 10, 53361 Kaunas, Lithuania & jurgita. rutkauskaite-suciliene @ vdu. lt; https: // orcid. org / 0000 - 0003 - 4712 - 1865 jurgita.rutkauskaite-suciliene@vdu.lt text Zootaxa 2022 2022-03-11 5115 1 47 62 journal article 20276 10.11646/zootaxa.5115.1.3 5a0c5291-d75d-4770-87d9-da7dbc45a0d0 1175-5326 6346023 87DEE6CD-8170-47B5-B570-47F5131DB25A Theromyzon tessulatum ( Müller, 1774 ) ( Figures 4J–K ) Material examined : Molėtai (Nr. 4), n=1, 8.viii.2019 ; Šilalė (Nr. 8), n=1, 5.vii.2018 ; Mūšia (Nr. 14), n=1, 18.vi.2018 ; Maišia (Nr. 15), n=2, vii–viii. 2019 ; Šventoji (Nr. 20), n=1, 7.viii.2018 ; Siesartis (Nr. 23), n=1, 8.vii.2019 ; Akmena (Nr. 26), n=1, 2.2019;Šakarvai (Nr. 29), n=1, 20.viii.2018 ; Lūšiai (Nr. 30), n=1, 20.viii.2018 . Diagnosis : Body soft and gelatinous. 30 mm maximum length, and 3–4 mm width. General color of adult leeches is greenish-brown, dorsal surface is spotted by small black dots. Yellow warts scattered on dorsal surface and light–yellow spots locate on margins of body. Four pairs of eyespots arrange straight in head region ( Fig. 4J–K ). Four annuli between gonopores. Habitat : Theromyzon tessulatum has been found mainly in ponds from May to August. Specimens bearing juveniles were observed in July. Juveniles of age of one week or more, appeared green due the intestine content ( Fig. 4K ). Distribution : Species distributed in Holarctic regions. Based on number of findings in this study ( Table 1 , Fig. 1 ), it seems, that T. tessulatum is widespread, but not forming abundant populations. Usually, only solitary individuals occurred in each site.