Nematodes From West Bengal (India) XIII. Four New Species of Dorylaimidae, With a Key To the Species of Laimydor Us Siddiqi, 1969 (Dorylaimoidea)

Four new species of the family Dorylaimidae de Man, 1876 are described here: two each belonging to Laimydorus Siddiqi, 1969 and Calodorylaimus Andrassy, 1969. Laimydorus siddiqii n. sp., 1.99-2.85 mm long, has a lip region marked by a depression, odontostyle 26-31 μm, odontophore 29-37 μm, female tail 12-13 anal body-widths, male with a series of 21-26 contiguous ventromedian supplements and 53-57 μm spicules. Laimydorus baldus n. sp., 1.83-2.44 mm long, has a lip region marked by a depression, odontostyle 24-25 μm, odontophore 29-30 μm, female tail 7-8 anal body-widths, male with a series of 24 contiguous ventromedian supplements and 53 μm spicules. Calodorylaimus andrassyi n. sp., 2.60-3.47 mm long, has a lip region offset by a constriction, odontostyle 25-29 μm, odontophore 25-31 μm, female tail 12-15 anal body-widths, male with 16-18 ventromedian supplements arranged in two groups and 50-59 μm spicules. Calodorylaimus simplex n. sp., 1.79-2.74 mm long, has a rounded lip region marked by depression, odontostule 23-27 μm, odontophore 30-34 μm, female tail 17-19 anal body-widths, male with 20-22 ventromedian supplements arranged in two groups and 43-46 μm spicules. A key to the species of Laimydorus is provided.