Sprentascaris

Abstract

Key to species of the subgenus <i>Sprentascaris</i> parasitic in Neotropical freshwater fishes <p>1 Males with caudal alae and six pairs of postanal papillae.......................................................2</p> <p>- Males without caudal alae and less than six pairs of postanal papillae.............................................3</p> <p> 2 Ventricular appendix/oesophageal length ratio in males and females is 1:0.16. Caudal alae well-developed. Vulva situated at 1.82–3.94 mm from anterior extremity, approximately at 1/3 of body length........................... <i>R.</i> (<i>S.</i>) <i>mahnerti</i></p> <p> - Ventricular appendix/oesophageal length ratio in males is 1:0.34 and in females 1:0.36. Caudal alae rudimentary. Vulva at short distance below oesophagus, at 0.40–1.06 mm from anterior extremity............................... <i>R.</i> (<i>S.</i>) <i>lanfrediae</i></p> <p>3 Lateral alae well developed (broad). In males, three pairs of postanal papillae......................................4</p> <p>- Lateral alae absent or rudimentary. In males, five pairs of postanal papillae........................................5</p> <p> 4 Symmetrical and equal lips. In males, 22 pairs of preanal papillae. In females, mature eggs embryonated, thin-shelled................................................................................................ <i>R.</i> (<i>S.</i>) <i>marano</i></p> <p> - Dorsal lips smaller than ventrolateral ones. In males, 16 pairs of preanal papillae. In females, mature eggs embryonated with rough shell and membranous striations................................................. <i>R.</i> (<i>S.</i>) <i>saltaensis</i> <b>sp. nov.</b></p> <p> 5 Narrow oesophagus. Rounded tail in both sexes. Posterior end of males with ventral cuticular ornamentation. Length of spic- ules 0.14 mm. Parasites of Pimelodidae fishes................................................... <i>R.</i> (<i>S.</i>) <i>pimelodi</i></p> <p> - Oesophagus markedly broad. Pointed tail tip in both sexes. Males with smooth posterior ventral surface. Length of spicules between 0.15–0.25 mm.................................................................... <i>R.</i> (<i>S.</i>) <i>hypostomi</i></p>Published as part of <i>Ailán-Choke, Lorena Gisela, Ramallo, Geraldine & Davies, Dora, 2017, New species of Raphidascaris (Sprentascaris) (Nematoda: Anisakidae) in Rineloricaria steinbachi (Actinopterygii: Loricariidae) from Northwest Argentina, pp. 129-136 in Zootaxa 4231 (1)</i> on page 135, DOI: 10.11646/zootaxa.4231.1.10, <a href="http://zenodo.org/record/293599">http://zenodo.org/record/293599</a&gt