L. Forró szerk.: Miscellanea Zoologica Hungarica 9. 1994 (Budapest, 1994)

Nesemann, H.; Neubert, E.: New data to the leeches of the subfamily Trochetinae (Hirudinea, Erpobdellidae)

Trocheta africana sp. n. Description: small leeches, preserved specimens reach a length of 15 - 28 mm (holotype 28 mm), dorsally flattened, lateral fringes lacking, the cranial sucker rounded (Fig. 8); in its habit, this species resembles Dina lineata (O. F. Müller, 1774). Annulation: somites with 8 annuli, the two first narrow, followed by three wide and another three narrow annuli. Superficially, five narrow annuli are followed by three wide-spaced annuli. Annulation formula of the postclitellar region: cl, c2, b2, a2, b5, ell, d23, d24 (Fig. 13). The annulation type resembles Trocheta bykowskii Gedroyc, 1813. Dorsal part of the cranial sucker less elongated than in all other Trocheta-species, paragnaths small (Fig. 11). Colour of living specimens dark reddish brown, preserved specimens pale grey. Dorsally, four dark narrow longitudinal stripes are visible. The area between the inner paramedian stripes less pigmentated. This character is very well displayed in the cranial region (Figs 10, 13). Caudal sucker of preserved specimens narrower than the maximum body width. Genital pores separated by two annuli, male porus in the furrow XII b2/a2, the female porus in XII b5/cll (Fig. 12). Genital atrium small, rounded. The cornua are short and slender, bended outwards. The cornua reach the annulus c2 (Figs 14, 15). Locus typicus: Tunisia, Kroumirie 140 km W of Tunis, stream near Hammam Bourguiba, 27. 02. 1993, leg. W. Graf. Type material [the type lot contained 5 specimens]: The holotype is preserved in the collection of the Department of Zoology, Hungarian Natural History Museum, Budapest; 1 paratype in the Senckenberg Museum Frankfurt, remaining three paratypes in coll. Nesemann. Additional records: Tunisia, Monts de Téboursouk, mountain stream between Thibar and Téboursouk (Road 75), 28. 02. 1993, 1 specimen, leg. W. Graf; mountain stream near Ded Melah, 27. 02. 1993, 1 specimen, leg. W. Graf. Etymology: This species is named africana, for it is hitherto the only known species of the genus Trocheta from Africa. Habitat: little streams in the higher regions of North Tunisia and Algeria. Aquatic rheophilic species. The specimens were found under stones in the middle of the streams. Distribution: only known from the localities cited and from one locality in Algeria, published as Dina lineata (O. F. Müller, 1774) by Johansson (1914). Most probably, the localities given by Blanchard (1908) as Dina quadristriata (Grube, 1850) belong to the new species of Trocheta. The records of Blanchard (1908) came exactly from the same area, which was investigated in 1993 by Wolfram Graf. Dina punctata Johansson, 1927 1927 Dina lineata var. punctata et var. notata Johansson, Abh. Senckenberg. naturf. Ges., Frankfurt, 39 (3): 229, Fig. 5-6. Dina punctata belongs together with D. apathyi and D. stschegolewi to the group of larger, dark coloured and yellowish spotted species, which was described as Dina apathyi complex (Nesemann 1990). Dina punctata ranges from South Western Europe, D. apathyi from the Pannonian Basin and D. stschegolewi from the Near East and Black Sea area. These species can be distinguished by their constant morphological and anatomical characters. In some areas, the species show sympatric distributional patterns. The colour of D. punctata varies to a great extent. The description by Johansson was based on specimens from the Northern Ebro basin in Spain. The type material was checked, a detailed description was given by Nesemann (1990, 1993a, b). Based on additional material from this area, further information can be added (Fig. 16-21, 28). Up to now, two species of the genus,