Features of Sexual Reproduction and Mating System of Ulnaria acus (Bacillariophyta)

Sexual reproduction and mating system of the freshwater diatom Ulnaria acus (Bacillariophyta) was described for the first time. Mating system of the species includes, apparently, only heterothallic way of reproduction: during the three-year observation period neither male nor female clones have shown the ability to reproduce homothallically. The type of sexual reproduction is cis-anisogamous; in many details it similar with reproduction of closely related species Ulnaria ulna, Tabularia fasciculata, and Tabularia tabulat

First data on the bionomics of Leptochilus (Euleptochilus) limbiferus (Morawitz 1867) (Hymenoptera: Vespidae: Eumeninae), with taxonomic notes and new records

Fateryga, Alexander V., Popovich, Anton V., Podunay, Yulia A., Fateryga, Valentina V. (2020): First data on the bionomics of Leptochilus (Euleptochilus) limbiferus (Morawitz 1867) (Hymenoptera: Vespidae: Eumeninae), with taxonomic notes and new records. Zootaxa 4851 (2): 289-304, DOI: 10.11646/zootaxa.4851.2.

Valve morphogenesis in selected centric diatoms

The traditional taxonomic affiliation of the diatom Ardissonea crystallina (C. Agardh) Grunow has been recently questioned, as it exhibits a mixture of polar centric and araphid pennate characters. Overall valve architecture and mode of sexual reproduction suggest that araphid pennates are its closest relatives. On the other hand, recovered molecular phylogenies consistently place it among the polar centrics. Our investigation of the earliest stages of valve morphogenesis, formation of the basal silica layer, adds to the argument that A. crystallina is indeed a polar centric diatom. We compared developmental stages in A. crystallina with unequivocally centric diatoms (non-polar Hyalodiscus stelliger and polar Biddulphia tridens) and published literature for araphid pennates and determined that A. crystallina has evolved an apparently unique mode of valve development. The significance of valve morphogenesis in better understanding diatom evolution and diversification is discussed.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author

Features of Sexual Reproduction and Mating System of Ulnaria acus (Bacillariophyta)

Впервые описано половое воспроизведение и система скрещивания пресноводной диатомовой водоросли Ulnaria acus (Bacillariophyta). Система скрещивания изучаемого вида включает, по- видимому, только гетероталлический способ воспроизведения: ни мужские, ни женские клоны на протяжении трехлетнего периода наблюдений не показали способности к гомоталлическому воспроизведению. Половое воспроизведение цис-анизогамного типа, во многих деталях оно напоминает воспроизведение близкородственных Ulnaria ulna, Tabularia fasciculata, Tabularia tabulataSexual reproduction and mating system of the freshwater diatom Ulnaria acus (Bacillariophyta) was described for the first time. Mating system of the species includes, apparently, only heterothallic way of reproduction: during the three-year observation period neither male nor female clones have shown the ability to reproduce homothallically. The type of sexual reproduction is cis-anisogamous; in many details it similar with reproduction of closely related species Ulnaria ulna, Tabularia fasciculata, and Tabularia tabulat