title: A New Freshwater Naked Lobose Amoeba Korotnevella venosa n. sp. (Amoebozoa, Discosea).
abstract: A new freshwater species of naked lobose amoebae Korotnevella venosa n. sp. isolated from freshwater pond in St. Petersburg, Russia was studied with light and transmission electron microscopy. Basket scales of this species have six vertical columns supporting perforated rim. The latter has tongue-like broadening with membranous region. Vertical columns bifurcate at both ends so that neighboring columns are connected by their bifurcations forming combined structure. Basket scales of K. venosa are similar to those of Korotnevella hemistylolepis in having six full-length vertical columns and perforated rim. At the same time, they are different in having tongue-like broadening of perforated rim with membranous region and absence of six half-length columns and an intermediate crosspiece. Phylogenetic trees based on 18S rDNA gene placed K. venosa either at the base of the whole Korotnevella clade, next to K. hemistylolepis, or as a sister to the clade comprising Korotnevella species with latticework basket in large scales.
authors.affiliation: Department of Invertebrate Zoology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia. chlamydophrys@gmail.com.
authors.forename: Ilya A
authors.initials: IA
authors.lastname: Udalov
authors.affiliation: Department of Invertebrate Zoology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia.
authors.forename: Vasily V
authors.identifier: 0000-0002-2688-3900
authors.initials: VV
authors.lastname: Zlatogursky
authors.affiliation: Department of Invertebrate Zoology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia.
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Smirnov
mesh_terms: D000656:Amoeba / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000648:ultrastructure; D016054:DNA, Protozoan / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D005618:Fresh Water / Q000469:parasitology*; D046529:Microscopy, Electron, Transmission; D010802:Phylogeny
chemical_list: D016054:DNA, Protozoan; D004275:DNA, Ribosomal
keywords: 18S rDNA; Dactylopodida; molecular phylogeny; scales; systematics; ultrastructure