title: Erpobdellid leeches (Annelida, Clitellata, Hirudinida) from Tunisia: new records with the description of a new Trocheta species.
abstract: Up to now in Tunisia, freshwater Hirudinida are represented by two mainly haematophagous families: Hirudinidae and Glossiphonidae, and a predatory one: the family Erpobdellidae. The present study provides new information on the diversity and taxonomy of erpobdellid leeches. Identification was based, in addition to morphological data, on the length of sperm ducts and the lengths of ovisacs in relation to the neurosomite (ns) and on the shape and size of the male atrium. Five taxons are found. Two subspecies are reported for the first time in the country: Dina punctata punctata Johansson, 1927 and Dina punctata maroccana Nesemann and Neubert, 1994. Tunisian populations of two species, Erpobdella testacea (Savigny, 1820) and Trocheta africana Nesemann and Neubert, 1994, are described, with records of new localities. The new Trocheta tunisiana n. sp. is discovered and described in detail. Trocheta species live in springs in elevated areas while Erpobdella seem to prefer low altitude reservoirs. A comprehensive comparison of the three genera is presented. The disparity between the actual systematics and phylogeny is discussed. This study gives also a detailed distribution of the five species in the north of Tunisia with notes on ecological preference of the genus Dina. Finally a key for the determination of freshwater erpobdellid species from Tunisia is proposed.
authors.forename: Raja
authors.initials: R
authors.lastname: Ben Ahmed
authors.forename: Aleksander
authors.initials: A
authors.lastname: Bielecki
authors.forename: Joanna M
authors.initials: JM
authors.lastname: Cichocka
authors.forename: Saïda
authors.initials: S
authors.lastname: Tekaya
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Gorzel
authors.forename: Abdul Halim
authors.initials: AH
authors.lastname: Harrath
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D017753:Ecosystem; D005260:Female; D007865:Leeches / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D008297:Male; D014416:Tunisia