Published in Paleontological Journal
AbstractWithin all major taxa of Bilateria, there are forms with coelomic metamerism. This suggests that coelomic metamerism was characteristic of the common ancestor of Bilateria. Among deuterostomes, metamerism is clearly expressed in chordates, and elements of metamerism are present in hemichordates. Do echinoderms have remnants of coelomic meta...
Published in Paleontological Journal
AbstractThe vegetation, widespread during the life of a young female mammoth “Yuka”, about 34 300 yr ago (GrA-53289) was reconstructed as a complex of phytocenoses confined to coastal water and floodplain habitats. The main pastures were herb-gramineous floodplain meadows. Here, floodplain shrub communities of birches and alder forests grew, the re...
Published in Paleontological Journal
AbstractMolluscan fossils have long been considered as an essential group for the paleoecological interpretations of the Paleogene stratigraphic successions. The distribution of bivalve and gastropod fossils in the Kopet-Dagh Mountains’ Paleogene successions, Chehelkaman and Khangiran formations, has been studied in this research. The fossil conten...
Published in Paleontological Journal
AbstractThe interstitial environment of sandy bottoms is an enigmatic habitat that forms unique ecosystems containing significant numbers of biodiversity. One of the lesser known marine invertebrate that inhabit this environment are sea cucumbers. The relative scarcity and lack of attention paid on these species have been the main obstacles to rese...
Published in Paleontological Journal
AbstractA short review of the results of 10 years of interdisciplinary study of Yuka, the frozen mummy of a young female woolly mammoth from Oyogos (Oyogos Yar, Ust-Yansky ulus, Republic of Sakha (Yakutia), Russia) and its significance for studying the biology and ecology of Mammuthus primigenius (Blumenbach, 1799) is given.
Published in Paleontological Journal
AbstractGogiid eocrinoids (Lower and Middle Cambrian) are basal echinoderms that document development of pentamerism, origin and emplacement of primitive respiratory structures (epispires), development of blastozoan stalks/stems and exothecal brachioles. By Lower Ordovician they (gogiids) show reduction in epispires. By Middle Ordovician epispires ...
Published in Paleontological Journal
AbstractThe question of the presence of kidneys in echinoderms is a subject of discussion. Many guides state the absence of a special excretory organ in the echinoderms. However, there is a special excretory organ (kidney) in echinoderms. It is the axial complex. The blood network of the axial complex is represented by the system of haemocoelic spa...
Published in Paleontological Journal
AbstractAn assemblage of plant fossils from the Kyzyl-Jar locality (southern Kazakhstan, Turonian) including polymorphic leaves of Ettingshausenia cuneifolia (Angiospermae), dispersed carpels, and solitary stamens, is studied. The morphology of the E. cuneifolia leaves resembles that of representatives of the Platanaceae. The dispersed carpels, Pla...
Published in Paleontological Journal
AbstractBased on new finds and additional evidence, the interpretation of the enigmatic echinoderm Bolboporites is confirmed; it is a blastozoan echinoderm most likely related to eocrinoids, in which juvenile holdfast, columnals, and reduced skeletal plates of the theca were fused into a single skeletal element, to which a biserial brachiole was at...
Published in Paleontological Journal
AbstractThe many Early Ordovician crinoid discoveries over the past 30 years signal a largely undocumented crinoid radiation. The new crinoid diversity totals more than five times the previous known Early Ordovician list as of the year 2000. Camerate, cladid, and disparid clades had emerged by the second half of the Tremadocian Series, early during...
