Some features of reproduction and egg development of <i>Stichaeus grigorjewi</i> from Peter the Great Bay

Reproduction of long shanny Stichaeus grigorjewi is observed in natural conditions and its eggs embryogenesis is investigated in details in aquarium. The embryos and larvae of S. grigorjewi differ from other species by strong development of midbrain that assumes good eyesight forming. Duration of egg development and morphology of embryos and larvae coincide with earlier description made in Hokkaido, Japan, except of body ventral row of 10 melanophores described for S. grigorjewi larvae for the first time. The embryogenesis accelerates sharply under heightened water temperature

The rise of feathered dinosaurs:Kulindadromeus zabaikalicus, the oldest dinosaur with ‘feather-like’ structures

Diverse epidermal appendages including grouped filaments closely resembling primitive feathers in non-avian theropods, are associated with skeletal elements in the primitive ornithischian dinosaur Kulindadromeus zabaikalicus from the Kulinda locality in south-eastern Siberia. This discovery suggests that ‘‘feather-like’’ structures did not evolve exclusively in theropod dinosaurs, but were instead potentially widespread in the whole dinosaur clade. The dating of the Kulinda locality is therefore particularly important for reconstructing the evolution of ‘‘feather-like’’ structures in dinosaurs within a chronostratigraphic framework. Here we present the first dating of the Kulinda locality, combining U-Pb analyses (LA-ICP-MS) on detrital zircons and monazites from sedimentary rocks of volcaniclastic origin and palynological observations. Concordia ages constrain the maximum age of the volcaniclastic deposits at 172.8 ± 1.6 Ma, corresponding to the Aalenian (Middle Jurassic). The palynological assemblage includes taxa that are correlated to Bathonian palynozones from western Siberia, and therefore constrains the minimum age of the deposits. The new U-Pb ages, together with the palynological data, provide evidence of a Bathonian age—between 168.3 ± 1.3 Ma and 166.1 ± 1.2 Ma—for Kulindadromeus. This is older than the previous Late Jurassic to Early Cretaceous ages tentatively based on local stratigraphic correlations. A Bathonian age is highly consistent with the phylogenetic position of Kulindadromeus at the base of the neornithischian clade and suggests that cerapodan dinosaurs originated in Asia during the Middle Jurassic, from a common ancestor that closely looked like Kulindadromeus. Our results consequently show that Kulindadromeus is the oldest known dinosaur with ‘‘feather-like’’ structures discovered so far.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Особенности позднего эмбрионального развития и предличинок восточного <i>Sebastes </i> <i>taczanowskii</i> и малого <i>S. </i> <i>minor</i> морских окуней (Sebastidae) в заливе Петра Великого Японского моря

Позднее эмбриональное развитие Sebastes taczanowskii и S. minor проходит за 25-30 дней в апреле-июле. Эмбрионы находятся в ячеистой ткани, окруженные большим количеством капель жира, облегчающим эмбриональное дыхание и выметывание предличинок. Общая длина предличинок S. taczanowskii 4,0-4,3 мм, у них есть 4-5 меланофоров на темени, дорзальный ряд из 22 меланофоров и вентральный - из 18, есть меланофоры на перитонеуме, нотохорд не загнут. Общая длина предличинок S. minor 5,2-6,5 мм, у них есть (или нет) скопление меланофоров на темени, затылке в форме вилочки, дорзальный ряд из 44-51 меланофора и вентральный - из 26-28, есть меланофоры на перитонеуме, нотохорд не загнут или загнут. У эмбрионов и предличинок от каждой самки наблюдается хорошо выраженный половой диморфизм, проявляющийся в разном уровне развития и разной степени меланофорной окраски

Paleocene origin of the cockroach families Blaberidae and Corydiidae: Evidence from Amur River region of Russia

Vršanský, Peter, Vidlička, Ľubomír, Barna, Peter, Bugdaeva, Eugenia, Markevich, Valentina (2013): Paleocene origin of the cockroach families Blaberidae and Corydiidae: Evidence from Amur River region of Russia. Zootaxa 3635 (2): 117-126, DOI: 10.11646/zootaxa.3635.2.