01642nas a2200193   4500008004100000022002200041245006800063210006700131260014400198300001400342490000700356520088800363100001801251700002001269700001801289700002501307700001701332856009901349       1998                        eng d  a0022-2844 (Print)00aPhylogeny of Nematoda and Cephalorhyncha derived from 18S rDNA.0 aPhylogeny of Nematoda and Cephalorhyncha derived from 18S rDNA  aSection of Evolutionary Biochemistry, A.N. Belozersky Institute of Physicochemical Biology, Moscow State University, Moscow 119899, Russia.  a597–6050 v473 aPhylogenetic relationships of nematodes, nematomorphs, kinorhynchs, priapulids, and some other major groups of invertebrates were studied by 18S rRNA gene sequencing. Kinorhynchs and priapulids form the monophyletic Cephalorhyncha clade that is the closest to the coelomate animals. When phylogenetic trees were generated by different methods, the position of nematomorphs appeared to be unstable. Inclusion of Enoplus brevis, a representative of a slowly evolving nematode lineage, in the set of analyzed species refutes the tree patterns, previously derived from molecular data, where the nematodes appear as a basal bilateral lineage. The nematodes seem to be closer to the coelomate animals than was speculated earlier. According to the results obtained, nematodes, nematomorphs, tardigrades, arthropods, and cephalorhynchs are a paraphyletic association of closely related taxa.1 aAleshin, V, V1 aMilyutina, I, A1 aKedrova, O, S1 aVladychenskaya, N, S1 aPetrov, N, B  uhttps://nematoda.myspecies.info/content/phylogeny-nematoda-and-cephalorhyncha-derived-18s-rdna02728nas a2200193   4500008004100000022002200041245005400063210005300117260013600170300001600306490000700322520201900329100001802348700002402366700002002390700001802410700001702428856008902445       2007                        eng d  a0006-2979 (Print)00aDo we need many genes for phylogenetic inference?0 aDo we need many genes for phylogenetic inference  aBelozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia. Aleshin@genebee.msu.su  a1313–13230 v723 aFifty-six nuclear protein coding genes from Taxonomically Broad EST Database and other databases were selected for phylogenomic-based examination of alternative phylogenetic hypotheses concerning intergroup relationship between multicellular animals (Metazoa) and other representatives of Opisthokonta. The results of this work support sister group relationship between Metazoa and Choanoflagellata. Both of these groups form the taxon Holozoa along with the monophyletic Ichthyosporea or Mesomycetozoea (a group that includes Amoebidium parasiticum, Sphaeroforma arctica, and Capsaspora owczarzaki). These phylogenetic hypotheses receive high statistical support both when utilizing whole alignment and when only 5000 randomly selected alignment positions are used. The presented results suggest subdivision of Fungi into Eumycota and lower fungi, Chytridiomycota. The latter form a monophyletic group that comprises Chytridiales+Spizellomycetales+Blastocladiales (Batrachochytrium, Spizellomyces, Allomyces, Blastocladiella), contrary to the earlier reports based on the analysis of 18S rRNA and a limited set of protein coding genes. The phylogenetic distribution of genes coding for a ubiquitin-fused ribosomal protein S30 implies at least three independent cases of gene fusion: in the ancestors of Holozoa, in heterotrophic Heterokonta (Oomycetes and Blastocystis) and in the ancestors of Cryptophyta and Glaucophyta. Ubiquitin-like sequences fused with ribosomal protein S30 outside of Holozoa are not FUBI orthologs. Two independent events of FUBI replacement by the ubiquitin sequence were detected in the lineage of C. owczarzaki and in the monophyletic group of nematode worms Tylenchomorpha+Cephalobidae. Bursaphelenchus xylophilus (Aphelenchoidoidea) retains a state typical of the rest of the Metazoa. The data emphasize the fact that the reliability of phylogenetic reconstructions depends on the number of analyzed genes to a lesser extent than on our ability to recognize reconstruction artifacts.1 aAleshin, V, V1 aKonstantinova, A, V1 aMikhailov, K, V1 aNikitin, M, A1 aPetrov, N, B  uhttps://nematoda.myspecies.info/content/do-we-need-many-genes-phylogenetic-inference00686nas a2200157   4500008004100000245016300041210006900204300001400273490000600287100001800293700001800311700002000329700002500349700001700374856013700391       1998                        eng d00aRelationships among nematodes based on the analysis of {18S} r{RNA} gene sequences:molecular evidence for monophyly of chromadorian and secernentian nematodes0 aRelationships among nematodes based on the analysis of 18S r RNA  a175–1840 v61 aAleshin, V, V1 aKedrova, O, S1 aMilyutina, I, A1 aVladychenskaya, N, S1 aPetrov, N, B  uhttps://nematoda.myspecies.info/content/relationships-among-nematodes-based-analysis-18s-rrna-gene-sequencesmolecular-evidence-monop