Nematodes of the order Dorylaimida from Andalucia Oriental, Spain. The genus Mesodorylaimus Andrassy, 1959. IV. Two relatively small sized new species with a compendium of their relatives

Two new species of the genus Mesodorylaimus Andrássy, 1959 are described from natural areas from southeastern Spain. M. brzeskii sp. nov. is distinguished by its body 1.14-1.44 mm long, quite thin cuticle, lip region continuous or offset by weak depression, odontostyle 11-13 µm or 0.9-1.2 times as long as the lip region width, pharyngeal bulb 79-105 µm long, V = 50-55, uterus 70.4 (55-87) µm or 2.1 (1.8-2.4) body diameters long, female tail first tapering abruptly and then gradually (53-80 µm, c = 16-28, c’ = 2.4-4.1) with its slender portion usually dorsad bent, male tail rounded conoid (18-22 µm, c = 58-65, c’ = 0.7-0.9), spicules 33-38 µm long and 7-8 (rarely 9) regularly spaced ventromedian supplements. M. malacitanus sp. nov. is characterized by having body 1.00-1.39 mm long, lip region slightly angular and offset by depression, odontostyle 11-13 µm long or almost equal to the lip region width, pharyngeal bulb 109-132 µm, junction between pharyngeal bulb and cardia with a weak ring-like structure, V = 48.5-56.1, peculiar morphology of the vagina-vulva area (vulva preceded of a funnel-like cavity, pars proximalis vaginae involved by developed musculature, pars refringens vaginae with two somewhat separated sclerotizations), uterus 49 (39-71) µm or 1.3 (0.9-1.9) times as long as the corresponding body width, female tail elongated (80-126 µm, c = 9.5-16.9, c’ = 3.2-5.1), and males unknown. A compendium of their relatives and comparison of the new species with them are also provided.