Pub Date : 2022-05-26DOI: 10.5710/AMGH.26.04.2022.3502
Yan‐Da Li, Erik Tihelka, Christopher J. Marshall, D. Maddison, M. Bai, Diying Huang, Chen-yang Cai
Abstract. The scarabaeoid beetle Mesoceratocanthus from the Early Cretaceous Yixian Formation was originally placed in the extant tribe Ivieolini (Hybosoridae). Our re-examination of the holotype and a new specimen demonstrates that Mesoceratocanthus does not possess the diagnostic characters of Ivieolini or Hybosoridae. Instead, it should be assigned to the passaloid lineage (Passalopalpidae + Passalidae) and appears closely related to the extinct family Passalopalpidae. The revised placement of Mesoceratocanthus further extends the earliest occurrence of the passaloid clade (∼125 Ma, Barremian to early Aptian). Resumen. El escarabajo scarabaeoideo Mesoceratocanthus de la Formación Yixian del Cretácico Inferior se asignó originalmente a la tribu existente Ivieolini (Hybosoridae). El nuevo examen del holotipo y de un nuevo espécimen demuestran que Mesoceratocanthus no posee los caracteres diagnósticos de Ivieolini o Hybosoridae. En cambio, debería asignarse al linaje passaloideo (Passalopalpidae + Passalidae) estando estrechamente relacionado con la familia extinta Passalopalpidae. La nueva asignación de Mesoceratocanthus cambia la primera aparición del clado passaloide (∼ 125 Ma, del Barremiano al Aptiano temprano).
{"title":"Mesoceratocanthus Fossils from the Early Cretaceous of China Reinterpreted as the Earliest Passaloids (Coleoptera: Scarabaeoidea)","authors":"Yan‐Da Li, Erik Tihelka, Christopher J. Marshall, D. Maddison, M. Bai, Diying Huang, Chen-yang Cai","doi":"10.5710/AMGH.26.04.2022.3502","DOIUrl":"https://doi.org/10.5710/AMGH.26.04.2022.3502","url":null,"abstract":"Abstract. The scarabaeoid beetle Mesoceratocanthus from the Early Cretaceous Yixian Formation was originally placed in the extant tribe Ivieolini (Hybosoridae). Our re-examination of the holotype and a new specimen demonstrates that Mesoceratocanthus does not possess the diagnostic characters of Ivieolini or Hybosoridae. Instead, it should be assigned to the passaloid lineage (Passalopalpidae + Passalidae) and appears closely related to the extinct family Passalopalpidae. The revised placement of Mesoceratocanthus further extends the earliest occurrence of the passaloid clade (∼125 Ma, Barremian to early Aptian). Resumen. El escarabajo scarabaeoideo Mesoceratocanthus de la Formación Yixian del Cretácico Inferior se asignó originalmente a la tribu existente Ivieolini (Hybosoridae). El nuevo examen del holotipo y de un nuevo espécimen demuestran que Mesoceratocanthus no posee los caracteres diagnósticos de Ivieolini o Hybosoridae. En cambio, debería asignarse al linaje passaloideo (Passalopalpidae + Passalidae) estando estrechamente relacionado con la familia extinta Passalopalpidae. La nueva asignación de Mesoceratocanthus cambia la primera aparición del clado passaloide (∼ 125 Ma, del Barremiano al Aptiano temprano).","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"59 1","pages":"201 - 209"},"PeriodicalIF":1.0,"publicationDate":"2022-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42873108","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 : 2022-05-26DOI: 10.5710/1851-8044-59.3.221
Laura S. Codorniú
{"title":"Pnso Field Guide to the Ancient World: Age of Pterosaurs","authors":"Laura S. Codorniú","doi":"10.5710/1851-8044-59.3.221","DOIUrl":"https://doi.org/10.5710/1851-8044-59.3.221","url":null,"abstract":"","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"59 1","pages":"221 - 223"},"PeriodicalIF":1.0,"publicationDate":"2022-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44034940","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 : 2022-03-15DOI: 10.5710/1851-8044-59.2.171
F. Garberoglio
{"title":"The Origin of Snakes: Morphology and the Fossil Record (1st Edition)","authors":"F. Garberoglio","doi":"10.5710/1851-8044-59.2.171","DOIUrl":"https://doi.org/10.5710/1851-8044-59.2.171","url":null,"abstract":"","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"59 1","pages":"171 - 173"},"PeriodicalIF":1.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44178697","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 : 2022-03-15DOI: 10.5710/AMGH.06.12.2021.3465
R. Macphee, A. Forasiepi
Abstract. On the basis of selected osteological markers, Patterson (1936) identified two pathways (here designated A and B) along which the internal carotid artery in notoungulates was said to travel in order to enter the skull and supply the brain. The existence of these pathways, at least as Patterson defined them, has been disputed but no substantive alternatives have been proposed. Using comparative embryological and morphological evidence based on conditions in extant mammals, we find that pathway A (intratympanic) is not supported. Pathway B (enclosed extratympanic) is supportable, but as far as is now known applies only to a small number of notoungulate taxa. On the basis of new evidence, we propose another route, pathway C, briefly mentioned by Scott (1912) but subsequently ignored, that may apply to the majority of notoungulates. In pathway C (unenclosed extratympanic) the internal carotid passed directly into the endocranium via a naturally unossified area of the basicranium, the piriform fenestra, rather than coursing through or alongside the middle ear in a canal. The absence of a separate, bony carotid foramen on the basicranium's ventral surface may explain the hesitancy of previous workers to consider this routing. There is no evidence that the function of the internal carotid artery was supplanted by another vessel (e.g., external carotid artery) in any notoungulate. Conditions in other major clades of South American native ungulates are poorly investigated, but some clearly differed from notoungulates in carotid patterning, pointing to the existence of substantial intertaxon disparities.
{"title":"Re-Evaluating Cranial Pathways of the Internal Carotid Artery in Notoungulata (Mammalia, Panperissodactyla)","authors":"R. Macphee, A. Forasiepi","doi":"10.5710/AMGH.06.12.2021.3465","DOIUrl":"https://doi.org/10.5710/AMGH.06.12.2021.3465","url":null,"abstract":"Abstract. On the basis of selected osteological markers, Patterson (1936) identified two pathways (here designated A and B) along which the internal carotid artery in notoungulates was said to travel in order to enter the skull and supply the brain. The existence of these pathways, at least as Patterson defined them, has been disputed but no substantive alternatives have been proposed. Using comparative embryological and morphological evidence based on conditions in extant mammals, we find that pathway A (intratympanic) is not supported. Pathway B (enclosed extratympanic) is supportable, but as far as is now known applies only to a small number of notoungulate taxa. On the basis of new evidence, we propose another route, pathway C, briefly mentioned by Scott (1912) but subsequently ignored, that may apply to the majority of notoungulates. In pathway C (unenclosed extratympanic) the internal carotid passed directly into the endocranium via a naturally unossified area of the basicranium, the piriform fenestra, rather than coursing through or alongside the middle ear in a canal. The absence of a separate, bony carotid foramen on the basicranium's ventral surface may explain the hesitancy of previous workers to consider this routing. There is no evidence that the function of the internal carotid artery was supplanted by another vessel (e.g., external carotid artery) in any notoungulate. Conditions in other major clades of South American native ungulates are poorly investigated, but some clearly differed from notoungulates in carotid patterning, pointing to the existence of substantial intertaxon disparities.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"59 1","pages":"141 - 161"},"PeriodicalIF":1.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49072303","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 : 2022-03-15DOI: 10.5710/AMGH.27.01.2022.3485
L. Pérez, J. López-Gappa
Abstract. This study describes two new species of cheilostome bryozoans associated with gastropod shells from the Monte León Formation (Burdigalian, early Miocene), Argentine Patagonia. Burdwoodipora griffini sp. nov. is the second known species and the first fossil representative of the genus, whose geographic distribution is so far restricted to the Magellan region in the southern Southwest Atlantic. It differs from the type species, B. paguricola, in lacking suboral adventitious avicularia in most autozooids. Odontoporella miocenica sp. nov. is morphologically very close to the type species, the Recent O. adpressa, from which it differs in having smaller zooids with fewer areolae and relatively wider orifices. The stratigraphic range of Odontoporella is here extended from the Pleistocene to the early Miocene. Its geographic distribution includes southern South America, New Zealand, and New Caledonia, suggesting an austral origin of the genus in the Paleogene of former Gondwana. The possible association of these two species with paguroid crabs is discussed.
{"title":"Bryozoans Associated with Gastropod Shells in the Early Miocene of Patagonia (Argentina)","authors":"L. Pérez, J. López-Gappa","doi":"10.5710/AMGH.27.01.2022.3485","DOIUrl":"https://doi.org/10.5710/AMGH.27.01.2022.3485","url":null,"abstract":"Abstract. This study describes two new species of cheilostome bryozoans associated with gastropod shells from the Monte León Formation (Burdigalian, early Miocene), Argentine Patagonia. Burdwoodipora griffini sp. nov. is the second known species and the first fossil representative of the genus, whose geographic distribution is so far restricted to the Magellan region in the southern Southwest Atlantic. It differs from the type species, B. paguricola, in lacking suboral adventitious avicularia in most autozooids. Odontoporella miocenica sp. nov. is morphologically very close to the type species, the Recent O. adpressa, from which it differs in having smaller zooids with fewer areolae and relatively wider orifices. The stratigraphic range of Odontoporella is here extended from the Pleistocene to the early Miocene. Its geographic distribution includes southern South America, New Zealand, and New Caledonia, suggesting an austral origin of the genus in the Paleogene of former Gondwana. The possible association of these two species with paguroid crabs is discussed.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"59 1","pages":"162 - 170"},"PeriodicalIF":1.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42795553","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 : 2022-03-15DOI: 10.5710/AMGH.16.10.2021.3461
Roberto Donna, G. Hassan, M. Osterrieth
Abstract. In this contribution, we describe assemblages of amorphous silica microfossils from a hydromorphic paleosol of the Southern Pampas and discuss their paleoenvironmental relevance through a comparative analysis with assemblages from two modern shallow lakes. The hydromorphic paleosol analyzed, assigned to the Pliocene/Pleistocene boundary by previous studies, is exposed in the coastal cliffs of the southeastern Buenos Aires province, Argentina. The shallow lakes selected as modern analogous environments are located 4.5 kilometers away. The hydromorphic paleosol contained well-preserved silicophytoliths, whereas diatoms, chrysophycean cysts, and spicules of sponges, were found in low abundances and poorly preserved. In the modern shallow lakes, silicophytoliths were also the main component of the assemblages, being diatoms the second most abundant component. Chrysophycean cysts were found in low abundances and represented by fourteen different types of cysts, five of which are mentioned for the first time in Argentina. Spicules of sponges were rarely found, represented only by fragmented megascleres. Considering the relevance of silicophytoliths for this record, we conducted a comparative analysis that allowed us to infer temperate humid paleoclimate during the pedogenesis of the hydromorphic paleosol. This is the first study comparing the silicophytolith assemblages from a hydromorphic paleosol with a local modern analogous environment. Our results highlight the potential use of amorphous silica microfossils as bioindicators in paleosols of the Late Cenozoic pedosedimentary successions of the Southern Pampas, where the homogeneous lithology has been an obstacle for the understanding of the paleoenvironmental evolution of the region.
{"title":"Paleoenvironmental Relevance of Amorphous Silica Microfossils in Hydromorphic Paleosols, a Comparative Study with Modern Analogous Environments in the Southern Pampas, Argentina","authors":"Roberto Donna, G. Hassan, M. Osterrieth","doi":"10.5710/AMGH.16.10.2021.3461","DOIUrl":"https://doi.org/10.5710/AMGH.16.10.2021.3461","url":null,"abstract":"Abstract. In this contribution, we describe assemblages of amorphous silica microfossils from a hydromorphic paleosol of the Southern Pampas and discuss their paleoenvironmental relevance through a comparative analysis with assemblages from two modern shallow lakes. The hydromorphic paleosol analyzed, assigned to the Pliocene/Pleistocene boundary by previous studies, is exposed in the coastal cliffs of the southeastern Buenos Aires province, Argentina. The shallow lakes selected as modern analogous environments are located 4.5 kilometers away. The hydromorphic paleosol contained well-preserved silicophytoliths, whereas diatoms, chrysophycean cysts, and spicules of sponges, were found in low abundances and poorly preserved. In the modern shallow lakes, silicophytoliths were also the main component of the assemblages, being diatoms the second most abundant component. Chrysophycean cysts were found in low abundances and represented by fourteen different types of cysts, five of which are mentioned for the first time in Argentina. Spicules of sponges were rarely found, represented only by fragmented megascleres. Considering the relevance of silicophytoliths for this record, we conducted a comparative analysis that allowed us to infer temperate humid paleoclimate during the pedogenesis of the hydromorphic paleosol. This is the first study comparing the silicophytolith assemblages from a hydromorphic paleosol with a local modern analogous environment. Our results highlight the potential use of amorphous silica microfossils as bioindicators in paleosols of the Late Cenozoic pedosedimentary successions of the Southern Pampas, where the homogeneous lithology has been an obstacle for the understanding of the paleoenvironmental evolution of the region.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"59 1","pages":"127 - 140"},"PeriodicalIF":1.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47843711","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 : 2022-01-18DOI: 10.5710/1851-8044-59.1.120
E. Vera
{"title":"Introduction to Paleobiology and the Fossil Record (2nd Edition)","authors":"E. Vera","doi":"10.5710/1851-8044-59.1.120","DOIUrl":"https://doi.org/10.5710/1851-8044-59.1.120","url":null,"abstract":"","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"59 1","pages":"120 - 126"},"PeriodicalIF":1.0,"publicationDate":"2022-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44297482","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 : 2022-01-06DOI: 10.5710/AMGH.13.09.2021.3427
Agustín Pérez Moreno, J. Carballido, A. Otero, L. Salgado, J. Calvo
Abstract. Titanosaurs were the predominant herbivores during the Late Cretaceous, inhabiting all continents. This clade was especially diverse in South America with some of the largest and smallest sauropod species known to date. Despite its diversity, the evolution of this clade is far from being well-known, although some recent analyses have begun to find some consensus in their results. Rinconsauria (defined as the least inclusive clade containing Rinconsaurus and Muyelensaurus) includes small titanosaurs and is considered as closely related to the lineage of giant titanosaurs, Lognkosauria (defined as the least inclusive clade containing Futalognkosaurus and Mendozasaurus), both being part of the recently named clade Colossosauria. The titanosaur Rinconsaurus caudamirus, from the Bajo de la Carpa Formation (Santonian), Río Negro, Argentina, is represented by several axial and appendicular elements from at least four specimens. This taxon was only briefly described when it was named and most of its originally proposed autapomorphies are now recognized as having a more widespread distribution amongst titanosaurs. Herein we present a detailed osteological description of the axial skeleton and a revised diagnosis for this taxon that firmly establishes its validity. Based on comparisons with other titanosaurs, we found three new possible autapomorphies for the axial skeleton of Rinconsaurus, which added to its original combination of characters, endorsing this taxon as a valid genus. Besides, this revision of Rinconsaurus provides additional osteological data that will contribute to a better resolution of titanosaur phylogeny, contributing at the same time to our understanding of the clade Rinconsauria.
{"title":"The Axial Skeleton of Rinconsaurus caudamirus (Sauropoda: Titanosauria) from the Late Cretaceous of Patagonia, Argentina","authors":"Agustín Pérez Moreno, J. Carballido, A. Otero, L. Salgado, J. Calvo","doi":"10.5710/AMGH.13.09.2021.3427","DOIUrl":"https://doi.org/10.5710/AMGH.13.09.2021.3427","url":null,"abstract":"Abstract. Titanosaurs were the predominant herbivores during the Late Cretaceous, inhabiting all continents. This clade was especially diverse in South America with some of the largest and smallest sauropod species known to date. Despite its diversity, the evolution of this clade is far from being well-known, although some recent analyses have begun to find some consensus in their results. Rinconsauria (defined as the least inclusive clade containing Rinconsaurus and Muyelensaurus) includes small titanosaurs and is considered as closely related to the lineage of giant titanosaurs, Lognkosauria (defined as the least inclusive clade containing Futalognkosaurus and Mendozasaurus), both being part of the recently named clade Colossosauria. The titanosaur Rinconsaurus caudamirus, from the Bajo de la Carpa Formation (Santonian), Río Negro, Argentina, is represented by several axial and appendicular elements from at least four specimens. This taxon was only briefly described when it was named and most of its originally proposed autapomorphies are now recognized as having a more widespread distribution amongst titanosaurs. Herein we present a detailed osteological description of the axial skeleton and a revised diagnosis for this taxon that firmly establishes its validity. Based on comparisons with other titanosaurs, we found three new possible autapomorphies for the axial skeleton of Rinconsaurus, which added to its original combination of characters, endorsing this taxon as a valid genus. Besides, this revision of Rinconsaurus provides additional osteological data that will contribute to a better resolution of titanosaur phylogeny, contributing at the same time to our understanding of the clade Rinconsauria.","PeriodicalId":50819,"journal":{"name":"Ameghiniana","volume":"59 1","pages":"1 - 46"},"PeriodicalIF":1.0,"publicationDate":"2022-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44044024","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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