Abstract Three known species, Aphelenchus avenae , Ditylenchus myceliophagus and Tylenchorhynchus aduncus (Rhabditida, Tylenchomorpha), are described from sand coastal dunes in Spain associated to the rhizosphere of xerophilic plants. A. is characterized by having stylet with 16–22 µm long, pharyngeal dorsal gland overlapping intestine, postvulval uterine sac about 2.5 times body diameter, fema...