| Resumo: |
The intraspecific variation of some nematode species from the Southern Bight of the North Sea is discussed.A redescription (or amplification) is provided for following species: <i>Gonionchus longicaudatus</i> (Ward, 1972), <i>Neochromadora angelica</i> Riemann, 1976, <i>N. munita</i> Lorenzen, 1971, <i>N. paratecta</i> Blome, 1974, <i>Sabatieria celtica</i> Southern, 1914, <i>S. longispinosa</i> Lorenzen, 1972, <i>S. punctata</i> (Kreis, 1924).Following taxonomic changes are proposed: <i>Gonionchus villosus</i> sensu Vincx, 1981 nec Cobb, 1920 is synonymized with <i>G. cumbraensis</i> Benwell, 1981; <i>Neochromadora paramunita</i> Boucher, 1976 is synonymized with <i>N. munita</i> Lorenzen, 1972; <i>Sabatieria strigosa</i> Lorenzen, 1972 is synonymized with <i>S. celtica</i> Southern, 1914; <i>Sabatieria mortenseni</i> (Ditlevsen, 1921), <i>S. breviseta</i> (Stekhoven, 1935) and <i>S. vulgaris</i> sensu Gerlach (1965) and sensu Riemann (1966) (nec de Man, 1907) are synonymized with <i>S. punctata</i> (Kreis, 1924).Two new species are described: <i>Gonionchus heipi</i> sp.n., a species mainly characterized by its aberrant cuticular ornamentation and <i>Neochromadora nicolae</i> sp.n. a species characterized by a weak cuticular ornamentation, cephalic setae less than 50% of corresponding body diameter (c.b.d.), prominent dorsal stomatal bulb, prominent ventral gland and males with eight minute preanal supplements.
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