6 NEW SPECIES OF THE GENUS LAIMYDORUS SIDDIQI, 1969 (NEMATODA, DORYLAIMOIDEA)

Six new species of Laimydorus are described. L. coroniceps n. sp. from Brazil is characterized mainly by very strongly offset, separate lips and odontostyle 40-44 mm long. L. vacillans n. sp. from Venezuela is characterized by the irregular shape of the male tail, ranging from co noid to spicate; the odontostyle is 31-34 mm long. L. uterinus n. sp. from Nigeria is characterized by the very short oviduct and the presen ce of a well developed pars musculosa uteri; the odontostyle is 25-30 mm long. The three other species were found in the Netherlands. L. bon gersi n. sp, is extremely slender (a = 66-90), with lip region continu ous and odontostyle 19-23 mm long. L. flevensis n. sp. is also very sl ender (a = 60-80); it differs from L. bongersi by shorter body, shorte r odontostyle (15-17 mm), longer female tail, and offset lip region. L . constrictus n. sp. is characterized by a constriction between the tw o parts of the female tail; the odontostyle is 20-24 mm long. Dorylaim us filiformis Bastian, 1865 and D. polyblastus Bastian, 1865 are consi dered species inquirendae and also incertae sedis.