Description of Drilocephalobus imperator sp. n. (Nematoda: Rhabditida: Osstellidae) from the Southern Iberian Peninsula, with a reinterpretation of the structure of the stoma

A new species of the genus Drilocephalobus, D. imperator sp. n., associated with xerophytic vegetation from coastal sand dunes of the southeast Iberian Peninsula, is described. The new species is distinguished from other species by its body size (0.80–0.90 mm in females and 0.75 mm in males), the number of longitudinal incisures in the lateral fields (n = 5), the length of the post-vulval sac (about twice the body diameter), the morphology of the female and male tails (conoid with rounded terminus), and the length (32 µm) and morphology of the spicules (almost straight, with a rounded manubrium that is scarcely bent ventrally). The anatomical structure of the stoma in Drilocephalobus is also reinterpreted. In addition, the species of the genus are reviewed and updated, and a key to valid species identification is provided.http://www.zoobank.org/urn:lsid:zoobank.org:pub:2E96A407-7714-4D8E-8136-E12F7199D0E5