Key to species of Myolaimus 1a Female body more than 1 mm ........................................................................... 2 1b Female body less than 1 mm ........................................................................... 3 2a Stoma three times longer than wide; male tail with papillae G1–G4 closely-grouped............................ rahmi 2b Stoma as long as wide; male tail with papillae GP1 visibly separated from the others........................ stammeri 3a Posterior stomatal chamber (behind the dorsal tooth) as big as the anterior one; larger amphid aperture, occupying one-third of the corresponding body diameter................................................................. amicitiae 3b Posterior stomatal chamber (behind the dorsal tooth) smaller than the anterior one or absent; smaller amphid aperture, occupy- ing one-fourth of the corresponding body diameter.......................................................... 4 4a Longer female tail (c’ = 7–10).......................................................................... 5 4b Shorter female tail (c’ = 2–6).......................................................................... 6 5a Dorsal tooth in stoma not prominent; shorter female rectum (1.5–2.0 times anal body diameter).................. indicus 5b Stoma with prominent dorsal tooth; longer female rectum (2.5–3.0 times anal body diameter)................... maupasi 6a Stoma with anterior stomatal chamber ca twice longer than wide; female tail very short, conoid (c’ = 2.0–2.5); male tail with

Published as part of Abolafia, Joaquín & Peña-Santiago, Reyes, 2016, Myolaimus ibericus sp. n. (Nematoda, Rhabditida, Myolaimidae) from southern Iberian Peninsula, with a key to species of the genus, pp. 365-380 in Zootaxa 4208 (4) on page 378, DOI: 10.11646/zootaxa.4208.4.4, http://zenodo.org/record/208353