Paleontological Journal最新文献_第8页

The Complex Structure of the Cuticle of Pseudagnostus (Agnostina, Trilobita?) 三叶虫(pseudoagnostina, Trilobita?)的复杂表皮结构

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/s0031030123070080

E. B. Naimark, S. Yu. Chaika

{"title":"The Complex Structure of the Cuticle of Pseudagnostus (Agnostina, Trilobita?)","authors":"E. B. Naimark, S. Yu. Chaika","doi":"10.1134/s0031030123070080","DOIUrl":"https://doi.org/10.1134/s0031030123070080","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The cuticle of Pseudagnostus ex gr. cyclopyge, a member of Agnostina, which is currently conditionally considered as an arthropod stem lineage, was studied using SEM. It has been believed so far that the agnostoid cuticle is simple and single-layered, differing in its primitive structure from other arthropods, both modern and extinct. However, our results showed that at least in this species, the cuticle has a very complex structure. Their carapace consisted of three layers, and each layer was characterized by its own features. The outer layer, which was a combination of a thin upper prismatic unit and a thick principal unit composed of relatively loosely packed lamellae, overlies the transitional layer. The transitional layer consists of stacks of thin lamellae, directed differently in each stack. On the thin inner layer there were numerous pits with a central element (peg). The peg pits create a specific profile of the inner layer, although the functions of these peg pits are not clear. The inner layer is underlain by a basal matrix of rhomboid fibrillar mesh possibly of chitin-protein nature. Specific cuticular sensilla were found both on the outer and inner layers. On the glabellar culmination there is a V-shaped groove with two rows of digitiform sensilla in the V-branches; campaniform sensilla were located along the symmetry axis between the branches. This sensory field apparently performed a mechanosensory function responding to currents outside an enrolled animal. Given the complexity of the integument of this species, further comparison with other agnostoid species, as well as with the cuticle of other arthropods, is needed. Such a comparison would be promising for understanding the phylogenetic position of Agnostina, as well as the evolution of the arthropod exoskeleton.","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"12 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138538725","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}

引用次数: 0

Palynostratigraphy and Foraminiferal Stratigraphy of the Early Miocene Qom Formation in the Northeastern Margin of the Tethyan Seaway 特提斯海道东北缘早中新世库姆组孢粉地层和有孔虫地层

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/s0031030123070031

Afsaneh Dehbozorgi, Saeed Maleki

{"title":"Palynostratigraphy and Foraminiferal Stratigraphy of the Early Miocene Qom Formation in the Northeastern Margin of the Tethyan Seaway","authors":"Afsaneh Dehbozorgi, Saeed Maleki","doi":"10.1134/s0031030123070031","DOIUrl":"https://doi.org/10.1134/s0031030123070031","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>Lower Miocene strata are exposed in the northwest of Ashtian, in the Central Iran Zone. Biostratigraphy of the Qom Formation was investigated using dinoflagellate cyst and benthic foraminifera. The stratigraphic distribution of the dinocysts lead to the identification of two distinctive stratigraphically non-continuous palynozones viz., Caligodinium amiculum (late Aquitanian) and Cordosphaeridium cantharellus (early Burdigalian) zones. This biozonation is equivalent to that recognized in Northwest Europe. Moreover, the presence of such stratigraphically distinctive taxa as Borelis melo curdica, Meandropsina iranica, Elphidium sp. 14, and Miogypsina sp. enabled the identification of the two consecutive biozones: the Elphidium sp. 14—Miogypsina Assemblage Subzone and the Borelis melo group Meandropsina iranica Assemblage Zone. The late Aquitanian–Burdigalian age is collectively attributed, therefore, to the studied section. This age assignment is based on the dinocysts and foraminifer species compared with other stratigraphic sections. The close resemblance of the dinoflagellate cyst assemblages of the Qom Basin with Northwest Europe and the northwestern Tethys during the Oligocene-early Miocene indicates a marine connection and faunal exchange between the two regions.","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"54 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138543496","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}

引用次数: 0

Sinuijublatta, a New Cockroach (Insecta: Blattaria: Caloblattinidae) from the Lower Cretaceous of Paektho-Dong, Sinuiju, Democratic People’s Republic of Korea 朝鲜新义州白洞下白垩世一新蜚蠊(昆虫纲:蜚蠊亚目:小蠊科)

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/s0031030123070110

K. S. So, C. G. Won

引用次数: 0

Two New Species of the Tribe Tesserocerini (Coleoptera: Platypodidae) from Miocene Ethiopian Amber 中新世埃塞俄比亚琥珀中扁足类二新种(鞘翅目:扁足科)

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/s0031030123070079

A. A. Legalov, Maximilian G. Pankowski

引用次数: 0

The First Known Mesozoic Mammal in the Democratic People’s Republic of Korea 朝鲜民主主义人民共和国已知的第一个中生代哺乳动物

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/s0031030123070122

C. G. Won, K. S. So, S. H. Jon

{"title":"The First Known Mesozoic Mammal in the Democratic People’s Republic of Korea","authors":"C. G. Won, K. S. So, S. H. Jon","doi":"10.1134/s0031030123070122","DOIUrl":"https://doi.org/10.1134/s0031030123070122","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>A partial skeleton of a Mesozoic mammal has been discovered from the fourth member (tuffaceous sandstone) of the Lower Cretaceous Sinuiju Formation, Paekto-dong, Sinuiju city, North Phyongan Province, Democratic People’s Republic of Korea (DPRK). This specimen exhibits several characters common to all multituberculates. The femoral head is fully spherical and inflected, and sets off from the shaft by a long neck. The tibia has the pronounced, hook-like dorsolateral process in the proximal part and the medial and lateral articulating condyles on the tibia. The astragalus and the calcaneus are in juxtaposition, as preserved. The metatarsal V is offset from the cuboid. Hence this specimen belongs to multituberculate mammals. But this specimen has also the derived characters. The parafibula is not present. The calcaneocuboid facet is transverse with respect to the length of the calcaneus. In these regards, we suggest that the preserved postcranial skeleton of the new specimen has a mosaic of primitive and derived characters. This interpretation must be corroborated by additional mammal specimens from this locality.","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"340 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138543497","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}

引用次数: 0

Middle Jurassic Ostracodes from Joyan Member, Jaisalmer Formation, Jaisalmer, Rajasthan, India 印度拉贾斯坦邦Jaisalmer组Joyan段中侏罗世介形虫

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/s0031030123070055

Manisha Kumari

引用次数: 0

The First Finding of a Representative of the Genus Crinisarina Cooper and Dutro, 1982 (Athyridida) in the Late Famennian of Northeastern Iran 伊朗东北部晚法门世首次发现的criinisarina Cooper and Dutro属(Athyridida)代表

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/s003103012307002x

V. V. Baranov, Y. Nasiri, J. Sharifi, R. B. Blodgett, M. H. M. Gharaie, S. T. Nikbakht, M. Hadi

引用次数: 0

Conodonts from Moscovian–Kasimovian Boundary Interval in the Type and Reference Sections, Moscow Basin, Russia 俄罗斯莫斯科盆地莫斯科-卡西莫维安边界段的牙形刺类型和参考剖面

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/s0031030123070043

N. V. Goreva

{"title":"Conodonts from Moscovian–Kasimovian Boundary Interval in the Type and Reference Sections, Moscow Basin, Russia","authors":"N. V. Goreva","doi":"10.1134/s0031030123070043","DOIUrl":"https://doi.org/10.1134/s0031030123070043","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The GSSP for the Kasimovian Stage has not been fixed or defined. Several conodont species: Swadelina subexcelsa (Alekseev et Goreva, 2001), Idiognathodus turbatus (Rosscoe et Barrick, 2009) or Idiognathodus sagittalis (Kozitskaya, 1978) and Idiognathodus heckeli (Rosscoe et Barrick, 2013) were proposed and discussed by the Task Group as potential index taxa for the boundary definition. This paper describes the distribution of all potential conodont markers and refines the levels of their appearance in the key sections in the type region of the Kasimovian, considering revision of the previously obtained and new data. The traditional lower boundary of the Kasimovian Stage in the Moscow Basin coincides with the level of FAD of the conodont Swadelina subexcelsa. This species could be traced across large distances, including different continents and could be proposed as a good marker for the Moscovian-Kasimovian boundary. The first occurrences of other species as Idiognathodus sagittalis, I. turbatus and I. heckeli are fixed at the base of the middle member of the Neverovo Formation of the Khamovnikian Substage, i.e. much higher than the base of the Kasimovian that was established for the Carboniferous of Russia. The levels of the appearance of this species have a high potential for the global correlation, but it is not good solution for the definition of the Global Kasimovian Boundary.","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"189 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138538719","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}

引用次数: 0

Faunal Correlation of Middle Miocene Locality of Chabbar Syedan with Some Other Localities of Chinji Formation of Siwalik Group Chabbar Syedan 中新世地点与 Siwalik 组 Chinji 层其他一些地点的动物相关性

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/S0031030123070092

M. K. Nawaz, S. G. Abbas, M. A. Khan, M. A. Babar, K. Aftab, M. Ali, M. Akhtar

引用次数: 0

New Weevils (Coleoptera: Curculionidae) from Baltic Amber 波罗的海琥珀中的新象鼻虫（鞘翅目：瘤瘿虫科

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2023-11-30 DOI: 10.1134/S0031030123070067

A. Legalov

引用次数: 0