Journal of Paleontology最新文献_第6页

Micro-CT analysis of Katian radiolarians from the Malongulli Formation, New South Wales, Australia, and implications for skeletogenesis 澳大利亚新南威尔士州Malongulli组Katian放射虫的显微ct分析及其对骨骼形成的意义

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-04-05 DOI: 10.1017/jpa.2023.13

{"title":"Micro-CT analysis of Katian radiolarians from the Malongulli Formation, New South Wales, Australia, and implications for skeletogenesis","authors":"","doi":"10.1017/jpa.2023.13","DOIUrl":"https://doi.org/10.1017/jpa.2023.13","url":null,"abstract":"\u0000 A diverse and well-preserved radiolarian assemblage from the Malongulli Formation, New South Wales, Australia, contains 13 species representing 10 genera and six families. One new genus, Wiradjuri, is introduced to accommodate pre-Devonian single-shelled entactiniid taxa, and one new species, Secuicollacta malongulliensis, is recorded together with some previously described forms. The microstructures of the “rotasphaerid structure/primary unit” and the “ectopic spicule” are investigated to validate their roles as fundamental units in the Secuicollactidae, together with comprehensive documentation of the previously enigmatic Pseudorotasphaera internal skeleton.\u0000 The results of this investigation suggest that, among all radiolarian genera that survived the Late Ordovician Mass Extinction event (LOME) and transitioned into the Silurian, Secuicollacta, Haplotaeniatum, and Palaeoephippium maintained stable body plans during the transition and were more successfully established. The selective advantages these lineages had during the LOME were most likely spontaneous outcomes of the mode of structural development involving sequential skeletogenesis and a tendency to evolve toward simpler body plans.\u0000 UUID: http://zoobank.org/264c026f-35af-4025-a4f7-de8f9a91f8b9","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48091671","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

Crinoid calyx origin from stem radial echinoderms 来源于茎干放射状棘皮动物的蛛网膜肾盏

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-03-29 DOI: 10.1017/jpa.2023.14

T. Guensburg, R. Mooi, N. Mongiardino Koch

{"title":"Crinoid calyx origin from stem radial echinoderms","authors":"T. Guensburg, R. Mooi, N. Mongiardino Koch","doi":"10.1017/jpa.2023.14","DOIUrl":"https://doi.org/10.1017/jpa.2023.14","url":null,"abstract":"\u0000 Evidence from the earliest-known crinoids (Tremadocian, Early Ordovician), called protocrinoids, is used to hypothesize initial steps by which elements of the calyx evolved. Protocrinoid calyces are composed of extraxial primary and surrounding secondary plates (both of which have epispires along their sutures) that are unlike those of more crownward fossil and extant crinoids in which equivalent calycinal plating is strongly organized. These reductions inspired several schemes by which to name the plates in these calyces. However, the primary-secondary systems seen in protocrinoids first appeared among Cambrian stem radial echinoderms, with primaries representing centers around which secondaries were sequentially added during ontogeny. Therefore, the protocrinoid calyx represents an intermediate condition between earliest echinoderms and crownward crinoids. Position and ontogeny indicate certain primaries remained as loss of secondaries occurred, resulting in abutting of primaries into the conjoined alternating circlets characteristic of crinoids. This transformative event included suppression of secondary plating and modification or, more commonly, elimination of respiratory structures. These data indicate subradial calyx plate terminology does not correspond with most common usage, but rather, supports an alternative redefinition of these traditional expressions. Extension and adoral growth of fixed rays during calyx ontogeny preceded conjoined primaries in earliest crinoids. Restriction with modification or elimination of calyx respiratory structures also accompanied this modification. Phylogenetic analyses strongly support crinoid origination from early pentaradiate echinoderms, separate from blastozoans. Accordingly, all Tremadocian crinoids express a distinctive aggregate of plesiomorphic and apomorphic commonalities; all branch early within the crinoid clade, separate from traditional subclass-level clades. Nevertheless, each taxon within this assemblage expresses at least one diagnostic apomorphy of camerate, cladid, or disparid clades.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49040300","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

JPA volume 97 S92 Cover and Front matter JPA第97卷S92封面和封面

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-03-23 DOI: 10.1017/jpa.2023.16

引用次数: 0

Paleogeographical and paleoenvironmental significance of ostracodes from the Pennsylvanian Nagaiwa Formation, northeast Japan 日本东北部宾夕法尼亚-永洼组介形类的古地理和古环境意义

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-03-23 DOI: 10.1017/jpa.2022.108

G. Tanaka

引用次数: 0

Nonmarine ostracod fauna from the Lower Cretaceous Shinekhudag Formation (southwest Mongolia): taxonomy, biostratigraphy, and paleoecology 蒙古西南部下白垩统Shinekhudag组非海相介形类动物群:分类、生物地层学和古生态学

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-03-03 DOI: 10.1017/jpa.2023.5

Byung-Do Choi, Yaqiong Wang

{"title":"Nonmarine ostracod fauna from the Lower Cretaceous Shinekhudag Formation (southwest Mongolia): taxonomy, biostratigraphy, and paleoecology","authors":"Byung-Do Choi, Yaqiong Wang","doi":"10.1017/jpa.2023.5","DOIUrl":"https://doi.org/10.1017/jpa.2023.5","url":null,"abstract":"Abstract. This work provides the detailed investigation (taxonomy, biostratigraphy, and paleoecology) of a nonmarine ostracod fauna from the Shinekhudag Formation in Gobi–Altai area, southwest Mongolia. The samples from two sections (Tsagaan Tsuvarga and Oshih Hollow East) yielded various ostracods assigned to nine species belonging to six genera: Cypridea verrucata Neustrueva, 1974, C. ihsienensis Hou, 1958, C. unicostata Galeeva, 1955, C. tumefacta Neustrueva, 1974, Yumenia cf. Y. oriformis Hou, 1958, Scabriculocypris subscalara Zhang and Chen in Ye et al., 2003, ?Trapezoidella sp., Candona sp., and Vlakomia ulanense Neustrueva, 1977. The biostratigraphic application of our taxonomic results suggests that the age of the Shinekhudag Formation is Barremian–Aptian. In addition, the ostracod fauna shows strong affinities to faunas from northeast China and potentially northwest China, providing evidence of faunal exchanges between these regions and southwest Mongolia. The new discovery of Vlakomia ulanense indicates that mid-Cretaceous (Albian) species in northeast China probably originated in Mongolia at the time of deposition of the Shinekhudag Formation. Two ostracod assemblages in the studied sections reflect that different paleoenvironment settings have existed during deposition; the Tsagaan Tsuvarga Section represents a shallow-littoral zone of athalassic (inland) saline lake under arid climate, and the dominance of cypridoideans of the Oshih Hollow East Section is indicative of ephemeral water bodies.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"612 - 630"},"PeriodicalIF":1.4,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45701048","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: 2

New insight into Cenozoic Orbitestellidae (Gastropoda: Heterobranchia) from the Magellanic Region based on lower Neogene and Recent species 麦哲伦地区新生代眶足目（腹足目：异鳃亚目）的新认识

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-03-02 DOI: 10.1017/jpa.2023.8

Javier Di Luca, M. Griffin, G. Pastorino

引用次数: 0

JPA volume 97 issue 2 Cover and Front matter JPA第97卷第2期封面和封面事项

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-03-01 DOI: 10.1017/jpa.2023.18

引用次数: 0

Systematic paleontology of macroalgal fossils from the Tonian Mackenzie Mountains Supergroup 托尼安-麦肯齐山脉超群大型藻类化石的系统古生物学

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-03-01 DOI: 10.1017/jpa.2023.4

Katie M. Maloney, Dakota P. Maverick, J. Schiffbauer, G. Halverson, S. Xiao, M. Laflamme

{"title":"Systematic paleontology of macroalgal fossils from the Tonian Mackenzie Mountains Supergroup","authors":"Katie M. Maloney, Dakota P. Maverick, J. Schiffbauer, G. Halverson, S. Xiao, M. Laflamme","doi":"10.1017/jpa.2023.4","DOIUrl":"https://doi.org/10.1017/jpa.2023.4","url":null,"abstract":"Abstract. Proterozoic eukaryotic macroalgae are difficult to interpret because morphological details required for proper phylogenetic studies are rarely preserved. This is especially true of morphologically simple organisms consisting of tubes, ribbons, or spheres that are commonly found in a wide array of bacteria, plants, and even animals. Previous reports of exceptionally preserved Tonian (ca. 950–900 Ma) fossils from the Dolores Creek Formation of Northwestern Canada feature enough morphological evidence to support a green macroalgal affinity. However, the affinities of two additional forms identified on the basis of the size distribution of available specimens remain undetermined, while the presence of three unique algal forms supports other reports of increasing algal diversity in the early Neoproterozoic. Archaeochaeta guncho new genus new species is described as a green macroalga on the basis of its well-preserved morphology consisting of an unbranching, uniseriate thallus with uniform width throughout and possessing an elliptical to globose anchoring holdfast. A larger size class of ribbon-like forms is interpreted as Vendotaenia sp. A third size class is significantly smaller than Archaeochaeta n. gen. and Vendotaenia, but in the absence of clear morphological characters, it remains difficult to assign. As Archaeochaeta n. gen. and Vendotaenia represent photoautotrophic taxa, these findings support the hypothesis of increasing morphological complexity and phyletic diversification of macroalgae during the Tonian, leading to dramatic changes within benthic marine ecosystems before the evolution of animals.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"499 - 515"},"PeriodicalIF":1.4,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47090293","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: 1

Typhlocybinae leafhoppers (Hemiptera, Cicadellidae) from Eocene Rovno amber reveal a transition in wing venation and a defensive adaptation 始新世Rovno琥珀中斑叶蝉科叶蝉(半翅目，斑叶蝉科)揭示了翅脉的转变和防御性适应

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-03-01 DOI: 10.1017/jpa.2023.3

C. Dietrich, S. A. Simutnik, E. Perkovsky

{"title":"Typhlocybinae leafhoppers (Hemiptera, Cicadellidae) from Eocene Rovno amber reveal a transition in wing venation and a defensive adaptation","authors":"C. Dietrich, S. A. Simutnik, E. Perkovsky","doi":"10.1017/jpa.2023.3","DOIUrl":"https://doi.org/10.1017/jpa.2023.3","url":null,"abstract":"Abstract. The first fossil Typhlocybinae inclusions from Eocene Rovno amber are described and illustrated. They include two new monotypic genera of the extinct tribe Protodikraneurini, Retrorsotettix n. gen. with type species R. vlaskini n. sp. and Protoparallaxis n. gen. with type species P. clavatus n. sp. Also described and illustrated are two new monotypic genera of the extant tribe Dikraneurini, Eodikraneura n. gen. with type species E. obscura n. sp. and Rovnodikra n. gen. with type species Rovnodikra longipes n. sp. Retrorsotettix is the oldest leafhopper known to exhibit a false eyespot and false leg markings on the forewing, representing an early acquisition of a defensive strategy against visual predators. Appearance of a small insect with false eyespots in the Eocene fossil record may reflect increased pressure by visual predators, especially crown ornithuromorph insectivorous birds. Such birds and small insect prey with false eyespots remain unknown in the Cretaceous. Eodikraneura exhibits a unique condition of the hind wing venation in which radius posterior and media anterior veins are confluent for a short distance but then diverge before separately reaching the submarginal vein. This presumably represents a morphological transition between the Protodikraneurini, in which hind-wing radius posterior and media anterior veins are completely separate and connected by a radial-medial crossvein, and Dikraneurini, in which radius posterior and media anterior veins are completely confluent distally. A key to genera of Protodikraneurini is provided.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"366 - 379"},"PeriodicalIF":1.4,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46286155","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: 2

First Report of Sphenothallus Hall (Cnidaria, Medusozoa) from the Mesozoic Erathem (Upper Triassic, Slovenia) 中生代Erathem（上三叠纪，斯洛文尼亚）鞘翅目Hall（Cnidaria，Medusozoa）的首次报告

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-02-16 DOI: 10.1017/jpa.2023.1

Heyo Van Iten, R. Gašparič, T. Hitij, T. Kolar-Jurkovšek, B. Jurkovšek

{"title":"First Report of Sphenothallus Hall (Cnidaria, Medusozoa) from the Mesozoic Erathem (Upper Triassic, Slovenia)","authors":"Heyo Van Iten, R. Gašparič, T. Hitij, T. Kolar-Jurkovšek, B. Jurkovšek","doi":"10.1017/jpa.2023.1","DOIUrl":"https://doi.org/10.1017/jpa.2023.1","url":null,"abstract":"Sphenothallus Hall, 1847, one of the most widely distributed and longest ranging genera in the fossil record, has been documented from all systems of the Paleozoic Erathem except the Permian (Table 1), although it has been stated (e.g., Choi, 1990; Bolton, 1994; Fatka et al., 2012) that the genus also occurs in that system. At present the first appearance of this epibenthic, polypoid medusozoan cnidarian lies in Cambrian Stage 3, while the previously known youngest occurrences are in the Pennsylvanian System. Sphenothallus has been found in numerous formations on all continents except Australia and Antarctica. It occurs in a variety of marine facies ranging from shallow nearshore to deep offshore and has even been found in strata of coastal lacustrine origin, probably as an allochthonous element (Lerner and Lucas, 2011). Many of the rock units known to contain Sphenothallus also contain conulariids (Table 1), an extinct group of marine scyphozoans that may have been closely related to Sphenothallus (Van Iten et al., 1992, 1996). Van Iten et al. (1992) interpreted Sphenothallus as a medusozoan cnidarian of uncertain class-level affinities, but later Dzik et al. (2017) documented internal peridermal structures that may be homologous to similar features in the periderm of coronate scyphozoans (see for example illustrations in Van Iten, 1992, and Van Iten et al., 1996).","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"764 - 772"},"PeriodicalIF":1.4,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41730614","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: 1