Related Research Articles
The Bactritida are a small order of more or less straight-shelled (orthoconic) cephalopods that first appeared during the Emsian stage of the Devonian period with questionable origins in Pragian stage before 409 million years ago, and persisted until Carnian pluvial event in the upper middle Carnian stage of the Triassic period. They are considered ancestors of the ammonoids, as well as of the coleoids.
Crestfishes, family Lophotidae, are lampriform fishes found in most oceans. It consists of two extant and four extinct genera.
Alexandr Pavlovich Rasnitsyn is a Russian entomologist, expert in palaeoentomology, and Honored Scientist of the Russian Federation (2001). His scientific interests are centered on the palaeontology, phylogeny, and taxonomy of hymenopteran insects and insects in general. He has also studied broader biological problems such as evolutionary theory, the principles of phylogenetics, taxonomy, nomenclature, and palaeoecology. He has published over 300 articles and books in several languages. In August 2008 he was awarded the Distinguished Research Medal of the International Society of Hymenopterists.
Evgeny Aleksandrovich Maleev was a Soviet and Russian paleontologist who did most of his research on reptiles and Asian fossils, such as the naming of the ankylosaur Talarurus and theropods Tarbosaurus and Therizinosaurus along with the family Therizinosauridae.
Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1991.
Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1981.
Konzhukovia is an amphibian genus that belongs to an extinct group of temnospondyls, the largest clade of basal tetrapods including about 198 genera, 292 species, and more than half of which were alive during the early Mesozoic period. The animal was a predator that lived about 260 million years ago, and could get up to about three meters in length. Specifically, Konzukovia lived during the Permian, between 252 and 270 million years ago according to the type of rock the fossil was found in. There are three species within this genus, K. vetusta, K. tarda, and K. sangabrielensis, the first two originating from Russia while the latest originating from Southern Brazil. The discovery of this specimen in Southern Brazil provided more evidence to support the idea that during this animals existence, there was a “biological corridor” because of the supercontinent Pangea, allowing these species to be found so far apart from each other. Konzhukovia belongs to the family Archegosauridae, a family consisted of large temnospondyls that most likely compare to modern day crocodiles. Since the discovery of the latest species, K. sangabrielensis, Pacheco proposes that there must be the creation of a new family, Konzhokoviidae, a monophyletic group in a sister-group relationship with Stereospondlyi in order to accommodate the three species. Konzhukovia skulls usually exhibit typical rhinesuchid features including an overall parabolic shape, small orbits located more posteriorly, and the pterygoids do not reach the vomer. These animals were long-snouted amphibians that had clear adaptations made for fish catching, as well as exemplifying aquatic features.
Utegenia is a genus of early tetrapod. It is usually regarded as a basal seymouriamorph, but sometimes included in the Discosauriscidae or as a sister taxon of the latter. Only one species, Utegenia shpinari, found from Kazakhstan, is known. Urumqia, another basal seymouriamorph, from Urumqi, Xinjiang of China is probably a junior synonym of Utegenia.
Admetophoneus is a dubious genus of non-mammalian synapsid from Russia. Its type and only species is Admetophoneus kargalensis.
Molybdopygus is an extinct genus of estemmenosuchid dinocephalians from the Middle Permian of Russia. It is known from a single pelvis.
The Madygen Formation is a Late Triassic (Carnian) geologic formation and Lagerstätte in the Batken and Osh Regions of western Kyrgyzstan, with minor outcrops in neighboring Tajikistan and Uzbekistan. The conglomerates, sandstones and mudstones of the 560 m (1,840 ft) thick formation were deposited in terrestrial lacustrine, alluvial, fluvial and deltaic environments.
The Gnishik Formation is a geologic formation in Armenia, Azerbaijan and Iran. It preserves fossils dated to the Wordian age of the Permian period.
Archaeorrhynchus is an extinct genus of weevil from the family Nemonychidae. It is known from the Callovian-Oxfordian Karabastau Formation in Kazakhstan. The type species, Archaeorrhynchus tenuicornis, was named in 1926. Two other species, A. tenuicornis and A. carpenteri, were described from the same locality.
Gyrodactyloides is a genus of monogeneans in the family Gyrodactylidae.
The Bukachacha Formation is a geological formation in Zabaykalsky Krai, Russia dating to the Early Cretaceous (Barremian). The tuffaceous mudstones of the formation were deposited in a lacustrine environment.
Septopora is an extinct genus of bryozoan belonging to the order Fenestrida. It has been found in Pennsylvanian to Permian beds in North America, South America, Australia, and southwest and east Asia.
Tabulipora is an extinct genus of bryozoan belonging to the order Trepostomida. It has been found in beds of Permian age in North America, Spitzbergen, South America, and Asia. Specimens typically form cylindrical branching colonies.
Rhipidomella is an extinct genus of brachiopod belonging to the order Orthida and family Rhipidomellidae. Specimens have been found in Carboniferous to Permian beds in southwest Asia, the Moscow Basin, and North America.
Marginifera is an extinct genus of brachiopod belonging to the order Productida. Specimens have been found in Carboniferous to Triassic beds in Asia, Europe, Madagascar, and North America.
Eostaffella is an extinct genus of fusulinid belonging to the family Eostaffellidae. Specimens of the genus have been found in Carboniferous to Permian beds in Europe, Asia, and North America.
References
- 1 2 Shimansky, V.N. (1951). "On the question of the evolution of the Upper Paleozoic straight cephalopods". Doklady Akademii Nauk SSSR. 79 (5): 867–870.
- ↑ Meek, F.B. (1871). "Descriptions of new species of fossils from Ohio and other western states and territories". Proceedings of the Academy of Natural Sciences of Philadelphia. 23: 159–184.
- ↑ Gemmellaro, G.G. (1889). "La fauna de' calcari con Fusulina della valle del fiume Sosio nella provincia di Palermo". Giornale di Scienze Naturali ed Economiche. 20: 37–138.
- ↑ Shimansky, V.N. (1954). "Straight nautiloids and bactritoids of the Sakmarian and Artinskian stages of the South Urals". Trudy Paleontologicheskogo Instituta Akademii Nauk SSSR. 44: 1–156.
- ↑ Shimansky, V.N. (1968). "Carboniferous Orthoceratida, Oncoceratida, Actinoceratida and Bactritida". Trudy Paleontologicheskogo Instituta Akademii Nauk SSSR. 117: 1–151.
- ↑ Mapes, R.H. (1979). "Carboniferous and Permian Bactritoidea (Cephalopoda) in North America". The University of Kansas Paleontological Contributions. 64: 1–75.
- ↑ Shimansky, V.N. (1993). "Permian bactritoids of the Pamir". Paleontological Journal. 27 (3): 153–160.
- ↑ Miller, A.K.; Unklesbay, A.G. (1947). "The cephalopod fauna of the Conemaugh series in western Pennsylvania: supplement". Annals of the Carnegie Museum. 30: 319–330.
- ↑ Shchedukhin, A.Y. (2022). "The first find of Bactritoidea (Cephalopoda) in the Asselian–Sakmarian beds of the Shakhtau Reef (Bashkortostan)". Paleontological Journal. 56 (5): 496–502. doi:10.1134/S0031030122050112.
- ↑ Mutvei, H. (2017). "The new order Mixosiphonata (Cephalopoda: Nautiloidea) and related taxa; estimations of habitat depth based on shell structure". GFF. 139 (3): 219–232. doi:10.1080/11035897.2017.1330278.