01092nas a2200169   4500008004100000020001400041245010400055210006900159260000800228300001200236490000800248520056600256100001800822700001800840700001800858856004600876       1997                        eng d  a0018-815800aMarine nematodes of the family Draconematidae (Nemata): a synthesis with phylogenetic relationships0 aMarine nematodes of the family Draconematidae Nemata a synthesis  cDec  a185-2020 v3573 aThe family Draconematidae is reviewed. Diagnoses of all taxa are updated or emended, based upon an evaluation of diagnostic features. A phylogenetic analysis at the genus level based on parsimony suggested that Tenuidraconema belongs to the Draconematinae. A new genus Bathychaetosoma is erected to accomodate B. uchidai (Kito, 1983). It is characterized by a cephalic region with a smooth, non-thickened cuticle and numerous cephalic adhesion tubes located posterior to the head region and extending over more than two head diameters along the cervical region.1 aDecraemer, W.1 aGourbault, N.1 aBackeljau, T.  uhttps://nematodes.myspecies.info/node/24101365nas a2200181   4500008004100000020001400041245009800055210006900153260000800222300001200230490000700242520081800249100001801067700002001085700001401105700001801119856004601137       2003                        eng d  a1464-793100aReview of the ultrastructure of the nematode body cuticle and its phylogenetic interpretation0 aReview of the ultrastructure of the nematode body cuticle and it  cAug  a465-5100 v783 aThe phylogenctic interpretation of the nematode cuticle ultrastructure is reviewed within the framework of recent DNA-sequence data. In particular, the structure of the median and basal zones is discussed. Several structural elements of the cuticle seem to have arisen independently several times within the Nematoda and thus are highly homoplasious (e.g. the cortical or basal radial striae, spiral fibre layers and a fluid matrix with struts). Moreover, identifying the homology of the nematode cuticle ultrastructures is often very difficult at deep taxonomic levels. Hence, the cuticle appears to be unreliable regarding resolution of deep-level relationships in the Nematoda. However, at less inclusive taxonomic levels (e.g. families, genera,...) the cuticle seems to be a more reliable phylogenetic marker.1 aDecraemer, W.1 aKaranastasi, E.1 aBrown, D.1 aBackeljau, T.  uhttps://nematodes.myspecies.info/node/18501880nas a2200157   4500008004100000020001400041245018800055210006900243300001200312490000700324520129500331100001401626700001801640700001801658856004601676       2005                        eng d  a0007-972300aA new species of Glochinema (Epsilonematidae : Nematoda) from the oxygen minimum zone off Baja California, NE Pacific and phylogenetic relationships at species level within the family0 anew species of Glochinema Epsilonematidae Nematoda from the oxyg  a105-1260 v463 aGlochinema spinithorni sp. nov. is described from muddy, bathyal sediments of the oxygen minimum zone (OMZ) of the north eastern Pacific Ocean off Baja California. It is characterized by a rather large body length (over I mm), a large number of body rings (242-282), sexual dimorphism in the number and position of pharyngeal thorns near the head region, cuticular ornamentation with numerous hairy spines and two sets of stronger spines ventrally in the anterior body half, mid-sized spiral amphids, and by the number and arrangement of ambulatory setae and long spicules (over 100 mu m). The finding of a second OMZ Glochinema species with similar morphological characteristics supports the presumption that OMZs function as isolated habitats promoting endemism at low taxonomic levels. Results of phylogenetic analyses at the species level restricted to the Glochinematinae and Keratonematinae suggest that both OMZ species form a monophyletic group. An attempt was made to recognize phylogenetic relationships at species level within the family. The phylogenetic analyses were based upon a data matrix of 96 ingroup taxa and 25 characters. The results support the monophyly of the genera Leptepsilonema, Metepsilonema, Perepsilonema and Polkepsilonema (with or without Pternepsilonema).1 aNeira, C.1 aDecraemer, W.1 aBackeljau, T.  uhttps://nematodes.myspecies.info/node/166