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Nematodes of the order Dorylaimida from Andalucía Oriental, Spain. The genus Mesodorylaimus Andrássy, 1959. V.Two new species close to M. bastiani with a compendium of its relatives

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Two new species belonging to the genus Mesodorylaimus Andrássy, 1959 are described and illustrated from natural areas in south-eastern Spain. M. nevadensis sp.n. is characterised by a medium sized body (L = 1.40-1.67 mm in females and 1.27-1.63 mm in males), angular lip region offset by a more or less marked depression, odontostyle 12.5-14.0 μ m long or 1.1-1.3 times as long as the lip region width, pharyngeal bulb 106-155 μ m long, V = 48-55, pars refringens vaginae with two divergent, triangular to dropshaped sclerotisations well separated by a more or less distinct sclerotised area, female tail relatively long and straight (93-134 μ m, c = 10.4-15.1, c′ = 4.0-5.6), spicules 41-47 μ m long, and eight to ten ventromedian supplements. M. baeticus sp.n. is distinguished by its medium sized body (L = 1.38-1.80 mm), lip region continuous or offset by a weak depression, odontostyle 13-15 μ m or 1.1-1.3 times the lip region diam., pharyngeal bulb 126-158 μ m long, V = 49-56, pars refringens vaginae with two adjacent, trapezoid to drop-shaped sclerotisations, female tail (83-126 μ m, c = 12-19, c′ = 3.7-5.6) tapering abruptly at first, then thickening very slightly and finally tapering gradually to a cylindrical terminal portion, and males unknown. These two species being quite close to M. bastiani (Bütschli, 1873) Andrássy, 1959, a compendium is presented of the relatives of M. bastiani together with a comparative discussion. M. similibastiani Zell, 1986 is regarded as junior synonym of M. bastiani.

Nématodes de l'ordre des Dorylaimida d'Andalousie orientale, Espagne. Le genre Mesodorylaimus Andrássy, 1959. V. Deux nouvelles espèces proches de M. bastiani avec un compendium des espèces voisines - Deux nouvelles espèces, provenant de zones naturelles dans le sud-est de l'Espagne, appartenant au genre Mesodorylaimus Andrássy, 1959 sont décrites et illustrées. M. nevadensis sp.n. est caractérisé par un corps de taille moyenne (L = 1.40-1.67 mm chez les femelles et 1.27-1.63 mm chez les mâles), une région labiale angulaire et séparée du reste du corps par une constriction plus ou moins prononcée, un odontostyle long de 12.5-14.0 μ m ou 1.1-1.3 diam. de la région labiale, un bulbe pharyngien long de 106-155 μ m, V = 48-55, la pars refringens vaginae munie de deux sclérotisations bien séparées, divergentes, de forme triangulaire à ovoïde, une queue relativement longue et droite chez la femelle (93-134 μ m, c = 10.4-15.1, c′ = 4.0-5.6), des spicules longs de 41-47 μ m, et huit à dix suppléments ventromédians. M. baeticus sp.n. se distingue par son corps de taille moyenne (L = 1.38-1.80 mm), la région labiale continue ou séparée du reste du corps par une légère constriction, l'odontostyle long de 13-15 μ m ou 1.1-1.3 diam. de la région labiale, le bulbe pharyngien long de 126- 158 μ m, V = 49-56, la pars refringens vaginae munie de deux sclérotisations adjacentes trapézoïdales à ovoïdes, la queue de la femelle (83-126 μ m, c = 12-19, c′ = 3.7-5.6) se rétrécissant d'abord brutalement, puis s'épaississant très légèrement pour finalement se rétrécir graduellement jusqu'à une portion cylindrique terminale et l'absence mâles. Ces deux espèces sont proches de M. bastiani (Bütschli, 1873) Andrássy, 1959 et un compendium des espèces voisines de M. bastiani est donné de même qu'une discussion comparative. M. similibastiani Zell, 1986 est considéré comme synonyme mineur de M. bastiani.

Affiliations: 1: Departamento de Biología Animal, Vegetal y Ecología, Universidad de Jaén, Paraje ''Las Lagunillas'' s/n, Edificio B3, 23071-Jaén, Spain

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/content/journals/10.1163/156854100509529
2000-09-12
2016-12-09

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