Polycelis nigra (Müller, 1774)

Material examined

ZMA V. Pl. 6909.1, Oued El Akarit located in the governorate of Gabes, Tunisia, 5 March 2010, coll. A. H. Harrath, sagittal sections on 10 slides ; V. Pl. 6909.2, ibid., sagittal sections on 9 slides ; V. Pl. 6909.3, ibid., horizontal sections on 6 slides ; V. Pl. 6909.4, ibid.,sagittal sections on 12 slides