Helobdella stagnalis (Linnaeus, 1758). (Figures 3G–H–I). Material examined: Raseika (Raseiniai) (Nr. 1) n=12, 9.viii.2019; Klibiai (Kretinga) (Nr. 7), n=15, 4.vii.2018; Grūšlaukė (Palanga) (Nr. 9), n=9, 5. vii. 2019; Tūbinė (Šilalė) (Nr. 10), n=10, 15.vii. 2018; Kirneilė (Molėtai) (Nr. 13), n=11, 4.viii.2018; Maišia (Garliava) (Nr. 15), n=12, vii–viii. 2019; Ronžė (Palanga) (Nr. 17), n=9, 2.viii.2018; Šventoji (Kretinga) (Nr. 20), n=10, 7.viii.2018; Ilgis (Ignalina) (Nr. 33), n=5, 21.viii.2018. Diagnosis: Body flat, leaf–shape. 10 mm length, and 2–4 mm width. Body whitish with numerous tawny spots on dorsal surface. One pair of eyespots and a chitinous nuchal scute (Tiberti and Gentilli 2010, Ben Ahmed et al. 2015a) on dorsal surface in anterior region are clearly visible (Figs. 3G, H). Habitat: Common leech in ponds and small slow flowing rivers. Specimens with developing cocoons and juveniles attached to the ventral surface were found from May to August (Fig. 3I). Juveniles were about 1 mm length in May, and their number on the adults varied from 1 to 12. Distribution: Helobdella stagnalis (Linnaeus, 1758), is one of the most widely distributed species of freshwater leeches, it has been reported from all continents except Australia (Platt et al. 1993; Ben Ahmed et al. 2015b) however it may represent a complex of multiples species (see Iwama et al 2019). Previously, this species was recorded in Curonian lagoon, Lithuania (Szidat 1926; Gasiūnas 1959; Zettler and Daunys 2007) and based on our results, (Table 1) it is clear that H. stagnalis is widespread throughout the country.
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