Eleutherolaimus Filipjev 1922

Genus Eleutherolaimus Filipjev, 1922 Diagnosis (emended from Leduc and Zhao 2023) Body slender and cylindrical. Anterior sensilla are usually arranged in three circles: six inner labial papillae and two successive circles of four setae located lateroventrally and latero-dorsally. The pattern may be supplemented with two mediolateral setae in pre- or postamphidial positions as well as one medioventral seta and one mediodorsal seta, resulting in 4 + 2 + 4, 4 + 6, or 6 + 4. Amphidial fovea circular, usually interrupted posteriorly. Buccal cavity cylindrical, with parallel cuticularised walls. Pharynx slender, without a distinct posterior bulb. Cardia elongate. Excretory pore in vicinity of nerve ring. Female reproductive system didelphic, with two opposed outstretched ovaries. Male reproductive system with two opposed testes, spicules ventrally curved, gubernacular apophyses dorsocaudally oriented. Tail conical with rounded tip, conico-cylindrical or cylindrical.