NEMATODES FROM ITALIAN SAND DUNES. 5. TWO NEW SPECIES OF DORYLAIMIDA AND THREE KNOWN SPECIES OF ENOPLIDA

Abstract

Two new species of Dorylaimida, found in coastal sand dunes in Sicily (Italy), are described and illustrated. Iotonchus paracutus sp. n. is characterised by its large and wide mouth cavity with basal dorsal tooth, didelphic reproductive apparatus, elongate-conoid tail with finely rounded terminus, absence of spinneret, gubernaculum without lateral processes, ten to eleven ventral precloacal papillae. Nygolaimus capitellus sp. n. is characterised by its relatively small size, expanded and low lip region, odontostyle 5.0 5.5 µm long, with wide lumen, expanded part of pharynx enveloped by a thin sheath, vulva pre-equatorial, tail conoid with blunt terminus. Three known species are also described: Trischistoma gracile Andrássy, 1985, the male of which is found for the first time, and the marine species of Enoplida Oncholaimus oxyuris Ditlevsen, 1911 and Tripyloides acherusius Gerlach, 1952.