Genus Neoleanira Pettibone, 1970b

Type species. Sigalion tetragonum Örsted, 1845

Diagnosis. (modified after Aungtonya 2002; Eibye-Jacobsen et al. 2022). Sigalioninae with oval prostomium. Median antenna with long style; median antennal ceratophore with a pair of auricles; lateral antennae rather long, fused with dorsal side of segment 1. Without facial tubercle. Segment 1 with dorsal ctenidial pads and inner tentacular lobes. Segment 3 with a long dorsal cirrus. Lateral lips of mouth aperture without labial lobes. Elytra colorless, smooth, or with tubercles and papillae. Neuropodia in median and posterior segment with three neuropodial lobes, one prechaetal and two postchaetal. Neurochaetae compound, with canaliculate blades; spines and simple chaetae might be present in upper position.