NEMATODES FROM ITALIAN SAND DUNES. 2. FOUR NEW AND A RARE SPECIES OF CHROMADORIDA

Abstract

Four new species and a known species of Chromadorida are described and illustrated. Achromadora arenicola sp. m. is characterized by medium size body, relatively small mouth cavity, amphids at stoma base, short rectum, absence of prerectum and of ventral precloacal papillae. Paracyatholaimus papillatus sp. n. is characterized by a rather short, conoid tail, spicules with a blunt distal end, gubernaculums lacking denticles, 6-8 ventral precloacal organs. Synonchium mediterraneum sp. n. is characterized by having mandibles with three teeth, a gubernaculums and ventral precloacal organs. Synonchium siculum sp. n. is characterized by having mandibles with three teeth, of which the apical is much larger than the lateral ones, a well developed spinneret, a gubernaculums and by lacking ventral precloacal organs. The rare species Deontolaimus papillatus de Man, 1880 is also described.