Pub Date : 2024-08-03DOI: 10.1134/s0031030124600318
V. V. Mitta, A. A. Mironenko
Abstract
A large-sized upper jaw of an ammonite from the Niortense Zone of the Upper Bajocian of the Kuban basin (Karachay-Cherkessia) is described. In its anterior part a pointed calcified structure (rhyncholite) is located. Judging by its shape and size, the upper jaw belonged to a species of the genus Lytoceras (family Lytoceratidae), the lower jaw of which was already described from the same area immediately below in the section. The presence of a rhyncholite allows us to attribute the new finding to the rhynchaptychus type of ammonoid jaws. This is the earliest known complete jaw of this type and, to date, the only known upper jaw of Lytoceratina. Probably, calcification of the anterior part of the jaw apparatus of ammonoids of the suborders Lytoceratina and Phylloceratina was a normal process occurring as the mollusk matured.
{"title":"An Exceptionally Large Upper Jaw of Lytoceratoidea from the Upper Bajocian (Middle Jurassic) of the Northern Caucasus","authors":"V. V. Mitta, A. A. Mironenko","doi":"10.1134/s0031030124600318","DOIUrl":"https://doi.org/10.1134/s0031030124600318","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A large-sized upper jaw of an ammonite from the <i>Niortense</i> Zone of the Upper Bajocian of the Kuban basin (Karachay-Cherkessia) is described. In its anterior part a pointed calcified structure (rhyncholite) is located. Judging by its shape and size, the upper jaw belonged to a species of the genus <i>Lytoceras</i> (family Lytoceratidae), the lower jaw of which was already described from the same area immediately below in the section. The presence of a rhyncholite allows us to attribute the new finding to the rhynchaptychus type of ammonoid jaws. This is the earliest known complete jaw of this type and, to date, the only known upper jaw of Lytoceratina. Probably, calcification of the anterior part of the jaw apparatus of ammonoids of the suborders Lytoceratina and Phylloceratina was a normal process occurring as the mollusk matured.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141939773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-20DOI: 10.1134/s0031030123600099
Chung-Il Ri, Sang-Ho Kim, Yi-Dan Zhu, Xuan-Wang, Won-Hak Jo
Abstract
Dendrolites that are characterized by dendritic fabrics on the basis of mesostructure are dominated by isolated dendritic clusters of calcimicrobes and are distinct from the laminated stromatolite. Dendrolites in the top part of the Miaolingian Zhangxia Formation at the Dongping section in Dongping County of Shandong province make up huge microbial reef with the thickness of 60 m that are developed in the sea-level falling period, which represent a spectacularly sedimentological phenomenon. Dendrolites are made from calcimicrobes belong to fossils of the Epiphyton group and Hedstroemia group. Microscopically, the bifurcating filamentous tip show bent or broken phenomenon, and the edges of thallus received partially negligible encrustation. This can reflect biological response to extreme environments. In addition, the morphological features of shrub thalli growing upwards and the branched morphology that shows the basic dendritic growth structure in particular, truthfully show the basic characteristics of dendrolites. This phenomenon can reflect the biological properties of microorganisms trying to maintain their own growth structures. The micritic crusts may reflect that the study area dendrolites were formed by sophisticated calcification of EPS that form microbial biofilms in microbial mats dominated by cyanobacteria. Therefore, microbial reef predominated by dendrolites in the top part of the Miaolingian Zhangxia Formation at the Dongping section are a typical example of demonstrating the fundamental characteristics of dendrolites different from clotted thrombolite, and further, provide some clues for the study of the biological attributes and responses between microorganisms and environments.
{"title":"The Role of Cyanobacteria in the Formation of Dendrolites: An Example from the Miaolingian Dendrolites, North China","authors":"Chung-Il Ri, Sang-Ho Kim, Yi-Dan Zhu, Xuan-Wang, Won-Hak Jo","doi":"10.1134/s0031030123600099","DOIUrl":"https://doi.org/10.1134/s0031030123600099","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Dendrolites that are characterized by dendritic fabrics on the basis of mesostructure are dominated by isolated dendritic clusters of calcimicrobes and are distinct from the laminated stromatolite. Dendrolites in the top part of the Miaolingian Zhangxia Formation at the Dongping section in Dongping County of Shandong province make up huge microbial reef with the thickness of 60 m that are developed in the sea-level falling period, which represent a spectacularly sedimentological phenomenon. Dendrolites are made from calcimicrobes belong to fossils of the <i>Epiphyton</i> group and <i>Hedstroemia</i> group. Microscopically, the bifurcating filamentous tip show bent or broken phenomenon, and the edges of thallus received partially negligible encrustation. This can reflect biological response to extreme environments. In addition, the morphological features of shrub thalli growing upwards and the branched morphology that shows the basic dendritic growth structure in particular, truthfully show the basic characteristics of dendrolites. This phenomenon can reflect the biological properties of microorganisms trying to maintain their own growth structures. The micritic crusts may reflect that the study area dendrolites were formed by sophisticated calcification of EPS that form microbial biofilms in microbial mats dominated by cyanobacteria. Therefore, microbial reef predominated by dendrolites in the top part of the Miaolingian Zhangxia Formation at the Dongping section are a typical example of demonstrating the fundamental characteristics of dendrolites different from clotted thrombolite, and further, provide some clues for the study of the biological attributes and responses between microorganisms and environments.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-01DOI: 10.1134/s0031030124700084
N. Zelenkov
{"title":"Gray Partridges (Phasianidae: Genera Perdix and Enkuria gen. nov.) from the Early Pleistocene of Crimea and Remarks on the Evolution of the Genus Perdix","authors":"N. Zelenkov","doi":"10.1134/s0031030124700084","DOIUrl":"https://doi.org/10.1134/s0031030124700084","url":null,"abstract":"","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141395162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-01DOI: 10.1134/s0031030124700114
V. M. Nazarova, M. A. Soboleva
{"title":"Icriodus multidentatus sp. nov. and I. quartadecimensis sp. nov.—New Conodont Species from the Frasnian Stage of the Southern Timan","authors":"V. M. Nazarova, M. A. Soboleva","doi":"10.1134/s0031030124700114","DOIUrl":"https://doi.org/10.1134/s0031030124700114","url":null,"abstract":"","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141402058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-01DOI: 10.1134/s0031030124700035
Yu. E. Demidenko, G. A. Karlova, D. A. Komlev
{"title":"New Data on the Microstructure of Tannuolina (Cambrian Zooproblematics)","authors":"Yu. E. Demidenko, G. A. Karlova, D. A. Komlev","doi":"10.1134/s0031030124700035","DOIUrl":"https://doi.org/10.1134/s0031030124700035","url":null,"abstract":"","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141391931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-01DOI: 10.1134/s003103012470014x
A. V. Mazaev
{"title":"А New Species of the Genus Lekiskochiton (Mollusca, Polyplacophora) from the Lower Permian Reef Limestones of Shakhtau (Southern Cis-Urals)","authors":"A. V. Mazaev","doi":"10.1134/s003103012470014x","DOIUrl":"https://doi.org/10.1134/s003103012470014x","url":null,"abstract":"","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141412819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-01DOI: 10.1134/s0031030124700047
E. N. Malysheva
{"title":"A New Species Paradeningeria magna sp. nov. (Sphinctozoa, Porifera) from the Nakhodka Reef (Southern Primorye)","authors":"E. N. Malysheva","doi":"10.1134/s0031030124700047","DOIUrl":"https://doi.org/10.1134/s0031030124700047","url":null,"abstract":"","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141415878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-01DOI: 10.1134/s0031030124700072
S. E. Golovanov, V. Zazhigin
{"title":"Evolution and Taxonomy of the Pleistocene North Asian Zokors, Genus Siphneus (Myospalacidae, Rodentia, Mammalia)","authors":"S. E. Golovanov, V. Zazhigin","doi":"10.1134/s0031030124700072","DOIUrl":"https://doi.org/10.1134/s0031030124700072","url":null,"abstract":"","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141397580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-01DOI: 10.1134/s0031030124700138
V. V. Mitta
{"title":"Stephanoceras humphriesianum (Ammonoidea), an Index Species of the Lower Bajocian, in the Basin of the Kuban River (Northern Caucasus, Russia)","authors":"V. V. Mitta","doi":"10.1134/s0031030124700138","DOIUrl":"https://doi.org/10.1134/s0031030124700138","url":null,"abstract":"","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141410943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-01DOI: 10.1134/s0031030124700096
V. K. Golubev, M. A. Naumcheva, E. I. Boyarinova
{"title":"Postcranial Osteoderms of Late Permian Pareiasaurs from Eastern Europe. I. Chronology of Localities","authors":"V. K. Golubev, M. A. Naumcheva, E. I. Boyarinova","doi":"10.1134/s0031030124700096","DOIUrl":"https://doi.org/10.1134/s0031030124700096","url":null,"abstract":"","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141395364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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