Some nematodes from freshwater fishes in central Africa Author Moravec, František Author Jirků, Miloslav text Folia Parasitologica 2017 033 2017-10-20 64 1 39 http://dx.doi.org/10.14411/fp.2017.033 journal article 10.14411/fp.2017.033 1803-6465 8143496 Atractidae gen. sp. fourth-stage larva Fig. 3 Description ( 1 female larva). Small whitish nematode 2.2 mm long, 111 wide, with smooth cuticle; very narrow lateral alae extend along body. Cephalic end rounded, 24 wide, bearing 4 small cephalic papillae. Oesophagus 468 long; its anterior portion long, narrow, 15–18 wide; short posterior portion somewhat broader, longitudinally oval, 75 long and 33 wide, provided inside with small sclerotised apparatus ( Fig. 3A ). Intestine narrow, straight. Nerve ring and excretory pore 186 and 291, respectively, from anterior extremity. Developing vulva postequatorial, 1.5 mm from anterior end of body (at 70% of body length). Tail conical, 202 long ( Fig. 3B ). Fig. 2. Labeonema longispiculatum sp. n. from Synodontis acanthomias Boulenger , scanning electron micrographs of male. A – cephalic end, apical view (arrows indicate lateral alae); B – cephalic end, sublateral view; C – anterior end of body, sublateral view (arrow indicates lateral ala); D – posterior end, sublateral view; E – posterior end, lateral view (another specimen); F – posterior end with distinct preanal papillae arranged in two rows, ventral view; G – tail, lateral view. Abbreviations : a – amphid; b – cephalic papilla; c – cloaca. Fig. 3. A , B – Atractidae gen. sp. larva from Clarias gariepinus (Burchell) (anterior and posterior body ends, lateral views). Host: North African catfish Clarias gariepinus (Burchell) (Silu- riformes: Clariidae ). Site of infection: Intestine (distal part). Locality : Lower Congo River , Democratic Republic of the Congo – unspecified locality in Bas Congo ( Congo basin, collected 10 July 2008 ) . Prevalence and intensity: 1 fish infected/2 fish examined; 1 nematode. Deposition of voucher specimen: IPCAS N-1137. Remarks. The general morphology of this female lar- va, especially the presence of a distinct sclerotised appa- ratus inside the bulbous posterior portion of the oesoph- agus, indicates that it belongs to the Atractidae . Recently Moravec and Van As (2015a) reported a nongravid female designated as Atractidae gen. sp. from the intestine of the catfish Schilbe intermedius Rüppel ( Schilbeidae ) in Botswana , which, however, differs from the present specimen in a larger body, a distinct pharyngeal portion of the oe- sophagus and isthmus and in the location of the vulva in the anterior part of the body.