Palaeontologia Electronica最新文献

{"title":"Oldest record of Alligator in southeastern North America","authors":"Alexander K. Hastings, B. Schubert, Jason R. Bourque, R. Hulbert","doi":"10.26879/1223","DOIUrl":"https://doi.org/10.26879/1223","url":null,"abstract":"The genus Alligator has been represented by large-bodied, predatory species in southeastern North America for at least 18 million years (early Miocene), in what is now the southeastern United States. However, the first occurrences of the genus were from a smaller-bodied species, A. prenasalis , known from South Dakota and Nebraska that are about 34 million years old (latest Eocene to earliest Oligocene). Ancestors of A. prenasalis were likewise small-bodied and are from the Great Plains. This 16 mil-lion-year-gap has left open questions regarding the arrival and body size shift of Alligator from what is now the Great Plains to southeastern North America. Recently studied fossil material from Florida exhibits the oldest occurrence of Alligator in the region (about 28–26 million years ago). A well-preserved premaxilla (UF 422816) bears the diagnostic premaxillary 'notch' of Alligator . Additional material from this and two other Oligocene sites in Florida are indicative of Alligator as well. These include well-devel-oped osteoderms, which suggest possible maturity at small body size. As of now, no records of larger Alligator from this time (or older) have been recovered from the region, possibly indicating body size may not have increased in Alligator until the Miocene","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69148039","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}

{"title":"New species and evolution of the foraminiferal family Janischewskinidae in the middle–upper Mississippian of South China","authors":"Chaolu Liu, D. Vachard, P. Pedro, I. Coronado","doi":"10.26879/1238","DOIUrl":"https://doi.org/10.26879/1238","url":null,"abstract":"Rich foraminiferal assemblages from the Bama Platform in South China allow clarifying the systematics, composition, and biostratigraphy of the family Janischewski-nidae. The family is comprised of four genera, Janischewskina, Cribrospira, Bibradya, and Parajanischewskina . The genera Rhodesinella and Groessensella are considered to be synonyms of Cribrospira and Bibradya , respectively","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69148232","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}

{"title":"The Middle Devonian acanthodian Orcadacanthus n. gen. from the Orcadian Basin of Scotland","authors":"M. Newman, Jan de Blaauwen, C. Burrow, Roger Jones, R. Davidson","doi":"10.26879/1240","DOIUrl":"https://doi.org/10.26879/1240","url":null,"abstract":"","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69148240","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}

{"title":"The anatomy and diversity of the pterosaurian sternum","authors":"D. Hone","doi":"10.26879/1261","DOIUrl":"https://doi.org/10.26879/1261","url":null,"abstract":",","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69148537","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}

{"title":"Approaching the Khersonian Crisis: Fish otoliths from the upper Bessarabian (middle Sarmatian s.l.; Late Miocene) of Jurkine (Kerch Peninsula, Crimea)","authors":"W. Schwarzhans, A. Bratishko, Y. Vernyhorova","doi":"10.26879/1300","DOIUrl":"https://doi.org/10.26879/1300","url":null,"abstract":"After its separation from the world ocean, the Paratethys formed a large inland marine water body during the Serravallian and Tortonian (Middle to Late Miocene) with a diverse environmental setting that underwent multiple fast and short-lived ecological changes. The trapped bony fish fauna either adapted to the rapid ecological changes (forced endemism) or perished. A major event during the late Sarmatian s.l. (Kherso-nian; late Tortonian; Late Miocene) was the Khersonian Crisis in the Eastern Para-tethys, which is postulated to have","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69149038","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}

{"title":"New primates from the Eocene of Saskatchewan, Canada: Revision of the primates from the Cypress Hills Formation with description of new taxa","authors":"Jonathan M. G. Perry, A. Dutchak, J. Theodor","doi":"10.26879/1246","DOIUrl":"https://doi.org/10.26879/1246","url":null,"abstract":"True primates in the Canadian fossil record are known from only the Eocene epoch of southwestern Saskatchewan. They were originally described in the 1980s from two sets of localities: the Lac Pelletier localities (Duchesnean) and the Swift Current Creek (SCC) locality (Uintan). Additional fieldwork and sample sorting were carried out over the last decade. The present study includes a description of new primate dental material from the Swift Current Creek (SCC) locality. We name a new genus and two new species and revise the known primates for both the Lac Pelletier and SCC faunas. The Cypress Hills region of Saskatchewan likely represented a haven for small primates in the Eocene and may have supported an endemic primate fauna.","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69147851","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}

{"title":"A Pliocene goodeid fish of the Paleolake Amajac, Sanctórum, Hidalgo, Mexico","authors":"C. Caballero-Viñas, J. Alvarado‐Ortega, Kleyton Magno Cantalice Severiano","doi":"10.26879/1259","DOIUrl":"https://doi.org/10.26879/1259","url":null,"abstract":"The splitfin fossil species Paleocharacodon guzmanae gen. and sp. nov. is erected based on the osteological study of 14 fossil male and female specimens recovered in the Pliocene deposits of the Paleolake Amajac, in Sanctórum, Hidalgo, Mexico. This new cyprinodontiform fish exhibits the diagnostic features of the family Goodeidae and subfamily Goodeinae; like all the goodeids, its premaxilla has a straight distal end, and its premaxillary ascending process is small; and, like the goodeines, this new species was viviparous, its first anal fin ray is rudimentary, and the males show an andropodium. Although P. guzmanae displays numerous primitive features, it is not possible to place it in any of the goodeine tribes, which currently are vaguely defined by osteological features. This new species seems to be closely related to Characodon; both share a peculiar osteological character; the articular facet for the quadrate is a donut-like structure, in which the retroarticular forms the central region, and a couple of semicircular anguloarticular processes form the surrounding part. This species differs from other goodeids mainly in two features; it has a posttemporal bone with small anteroventral processes, and the openings of its supraorbital canal show the formula12a, 2b-3a, 3b-4a, 4b-5a, and 5b-7. The discovery of this extinct goodeid species in the great Pánuco-Salado Basin on the eastern slope of Mexican territory represents an unexpected historical element. Carmen Caballero-Viñas. Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México. Circuito de la Investigación S/N, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, Mexico. c-caballero@live.com.mx Jesús Alvarado-Ortega. Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México. Circuito de la Investigación S/N, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, México. alvarado@geología.unam.mx Kleyton Magno Cantalice Severiano. Departamento de Paleontología, Instituto de Geología, Universidad CABALLERO-VIÑAS ET AL.: PLIOCENE GOODEID FROM MEXICO 2 Nacional Autónoma de México. Circuito de la Investigación S/N, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, México. kleytonmc@geologia.unam.mx","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69148460","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}

{"title":"Differentiating convergent pathologies in turtle shells using computed tomographic scanning of modern and fossil bone","authors":"Stephanie K Drumheller, Hannah F. Maddox, M. Stocker, Christopher R. Noto","doi":"10.26879/1230","DOIUrl":"https://doi.org/10.26879/1230","url":null,"abstract":"","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69148054","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}

{"title":"A reconsideration of the palinuroid family Synaxidae (Crustacea, Decapoda), with a new member from the Upper Jurassic of southern Poland","authors":"René H. B. Fraaije, B. V. van Bakel, J. Jagt, M. Krobicki, À. Ossó, F. Palero, J. Wallaard","doi":"10.26879/1252","DOIUrl":"https://doi.org/10.26879/1252","url":null,"abstract":"Representatives of the family Synaxidae, commonly referred to as furry lobsters, are rare constituents of modern-day marine communities, while their fossil record suggests that they were more common in the past, in reefal settings during the Late Jurassic across Europe, from where at least three species have been recorded","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69148328","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}

{"title":"Linking burrow morphology to the behaviors of predatory soil arthropods: Applications to continental ichnofossils","authors":"Daniel I. Hembree","doi":"10.26879/1257","DOIUrl":"https://doi.org/10.26879/1257","url":null,"abstract":"Predatory arthropods are known from terrestrial environments since the Silurian. Many of these animals have developed morphological and behavioral adaptations for living within soil environments. Ichnofossils are common in Paleozoic paleosols, yet most are of uncertain origin and may record a hidden diversity of predatory arthropods. These ichnofossils are especially important given the relatively poor preservation potential of soil invertebrates in the environments they inhabit. To better understand the morphology and uses of predatory soil arthropod burrows, laboratory experiments were conducted with centipedes, scorpions, whip scorpions, and spiders. Specimens were placed in sediment-filled terrariums for 1 to 36 weeks. The animals were observed continuously using digital recordings to monitor their behaviors and use of their burrows. Open burrows were cast and described qualitatively and quantitatively. The animals burrowed using various techniques including intrusion, compression, excavation, and backfilling. Some burrows were occupied for short intervals (2-5 days) before being abandoned, whereas others were permanently occupied. Burrows ranged from simple vertical shafts to complex, branching networks that served as temporary to permanent dwellings, and most were used as sites for ambush predation or as prey traps. The different predatory arthropods produced unique burrows that could be linked to specific behaviors. Distinct burrow features were linked to predatory activities including vertical shafts, multiple surface openings, branching tunnel networks, and expanded chambers. These data can be applied to continental ichnofossils to improve our understanding of the evolution of terrestrial predatory arthropods, their distribution through time, and interpretations of the paleoecology of ancient soil ecosystems. Daniel I. Hembree. Department of Earth and Planetary Sciences, University of Tennessee Knoxville, Knoxville, Tennessee 37996, USA, dhemre2@utk.edu","PeriodicalId":56100,"journal":{"name":"Palaeontologia Electronica","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69148446","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}