American Museum Novitates最新文献_第6页

Cephalopods from the Cretaceous-Paleogene (K-Pg) Boundary Interval on the Brazos River, Texas, and Extinction of the Ammonites 德克萨斯州布拉佐斯河白垩纪-古近纪（K-Pg）边界层的头足类动物和亚扪人的灭绝

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2021-01-13 DOI: 10.1206/3964.1

J. Witts, N. Landman, M. Garb, Kayla M. Irizarry, E. Larina, N. Thibault, Mohammad Javad Razmjooei, T. Yancey, C. Myers

{"title":"Cephalopods from the Cretaceous-Paleogene (K-Pg) Boundary Interval on the Brazos River, Texas, and Extinction of the Ammonites","authors":"J. Witts, N. Landman, M. Garb, Kayla M. Irizarry, E. Larina, N. Thibault, Mohammad Javad Razmjooei, T. Yancey, C. Myers","doi":"10.1206/3964.1","DOIUrl":"https://doi.org/10.1206/3964.1","url":null,"abstract":"ABSTRACT We report on new collections of cephalopods (ammonites and nautilids) from the Cretaceous-Paleogene (K-Pg) successions of the Corsicana and Kincaid formations exposed along the Brazos River in Falls County, Texas. An abundant fauna of eight species comprising four genera of ammonites is described from the Corsicana Formation, including Discoscaphites mullinaxorum n. sp. The presence of abundant aptychi (probably lower jaws) of Discoscaphites and Eubaculites, as well as juvenile specimens, indicates a living population that experienced little postmortem drift. The lytoceratid genus Gaudryceras is also reported for the first time from the Brazos River area. Presence of the index taxon Discoscaphites iris (Conrad, 1858) indicates that the fauna belongs to the D. iris Range Zone, the highest ammonite range zone in North America. Correlation with new and existing microfossil data indicates that the fauna represents the uppermost Maastrichtian, and comparison with published records further suggests that this is the most diverse D. iris Zone fauna yet reported from the Gulf and Atlantic Coastal Plains of North America. Three ammonite genera are recorded from the basal units of the K-Pg event deposit at Brazos, which likely represents deposition in the immediate aftermath of the Chicxulub impact event. A single specimen of the nautilid Eutrephoceras is reported from the Danian Kincaid Formation, less than 300 kyr after the K-Pg boundary. These data provide new information on the differing fate of these cephalopod groups during the K-Pg mass extinction and add to the picture of diverse and abundant Maastrichtian ammonite faunas prior to the Chicxulub impact event.","PeriodicalId":55527,"journal":{"name":"American Museum Novitates","volume":"2020 1","pages":"1 - 52"},"PeriodicalIF":1.5,"publicationDate":"2021-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47835738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Cretaceous Diversity of the Relict Genus Alavesia Waters and Arillo (Diptera: Empidoidea: Atelestidae) 白垩纪残属Alavesia Waters和Arillo的多样性(双翅目:翅甲总科:翅甲科)

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-10-06 DOI: 10.1206/3961.1

B. Sinclair, D. Grimaldi

{"title":"Cretaceous Diversity of the Relict Genus Alavesia Waters and Arillo (Diptera: Empidoidea: Atelestidae)","authors":"B. Sinclair, D. Grimaldi","doi":"10.1206/3961.1","DOIUrl":"https://doi.org/10.1206/3961.1","url":null,"abstract":"ABSTRACT Alavesia has been known on the basis of five species in Late Cretaceous amber from Spain and Myanmar and two extant species from Namibia. Very recently, another extant species has been found in southern Brazil. Here we present a surprising diversity of Alavesia flies from the mid-Cretaceous of Myanmar (Late Albian-Early Cenomanian, ca. 99 Ma), including nine new species: A. angusta, sp. nov., A. brevipennae, sp. nov., A. lanceolata, sp. nov., A. latala, sp. nov., A. longicornuta, sp. nov., A. magna, sp. nov., A. pankowskiorum, sp. nov., A. spinosa, sp. nov., and A. zigrasi, sp. nov. The following new synonymy is proposed: Neoalavesia Poinar and Vega, 2020 = Alavesia Waters and Arillo, 1999. Notes are provided on an unusual structure, leg furrows found on femora to varying degrees among species, sometimes on tibiae, as well as notes on swarming behavior. Alavesia has undergone extensive extinction, a finding that further supports the relict nature of this genus and helps to explain the distribution of the other four Recent genera of Atelestidae, found in south and north temperate regions. Relict arthropod taxa preserved in Burmese amber are briefly reviewed, which also are narrowly endemic to temperate regions today.","PeriodicalId":55527,"journal":{"name":"American Museum Novitates","volume":"2020 1","pages":"1 - 40"},"PeriodicalIF":1.5,"publicationDate":"2020-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47783403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

First Known Extant Species of Alavesia (Diptera: Atelestidae) in the Neotropical Region: Alavesia leukoprosopa, sp. nov., from the Southern Atlantic Forest, Brazil 新热带地区已知的第一个现存物种：巴西南大西洋森林的白腹蛛属

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-10-06 DOI: 10.1206/3962.1

Dalton De Souza Amorim, P. Riccardi, J. A. Rafael

引用次数: 3

On the Identity of Victoria's Mouse Opossum, Marmosa regina Thomas, 1898 论维多利亚的老鼠Opossum，Marmosa regina Thomas，1898

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-09-10 DOI: 10.1206/3960.1

Thomas C. Giarla, R. Voss

引用次数: 3

Taxonomic Revision of Camarochilus Harris (Hemiptera: Pachynomidae) 金针虫分类修订（半翅目：扁虫科）

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-09-08 DOI: 10.1206/3959.1

C. Weirauch, D. Forero, R. Schuh

{"title":"Taxonomic Revision of Camarochilus Harris (Hemiptera: Pachynomidae)","authors":"C. Weirauch, D. Forero, R. Schuh","doi":"10.1206/3959.1","DOIUrl":"https://doi.org/10.1206/3959.1","url":null,"abstract":"ABSTRACT The Neotropical genus Camarochilus Harris, 1930 (Hemiptera: Pachynomidae) was described based on two species from Panama and Brazil. The genus has not been revised since its original treatment, and specimens beyond the original type series have remained undocumented. Based on examination of 57 specimens, including holotypes or paratypes of the previously described species, we here revise Camarochilus and recognize 10 species, with eight described as new: C. fasciatus, n. sp., C. gilli, n. sp., C. globosus, n. sp., C. harrisi, n. sp., C. medius, n. sp., C. picturatus, n. sp., C. robustus, n. sp., and C. tenuis, n. sp. Habitus images are provided for all species, male and female genitalic structures are documented, and various morphological characters are illustrated using digital photography. Measurements are included for all species. Male genitalic characters including the degree of asymmetry and type of ornamentation of the pygophore and shape of parameres constitute important species-diagnostic features, in addition to coloration and measurements. Distribution maps illustrate that species occur from Bolivia to Honduras, a considerable expansion of the previously known species distribution ranges in this genus.","PeriodicalId":55527,"journal":{"name":"American Museum Novitates","volume":"2020 1","pages":"1 - 31"},"PeriodicalIF":1.5,"publicationDate":"2020-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48032660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Systematics of Neotropical Spiny Mice, Genus Neacomys Thomas, 1900 (Rodentia: Cricetidae), from Southeastern Amazonia, with Descriptions of Three New Species 亚马逊东南部新热带棘鼠属分类学(啮齿目:鼠科)及三新种记述

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-09-05 DOI: 10.1206/3958.1

Thiago Borges Fernandes Semedo, M. N. D. Da Silva, E. Gutiérrez, D. C. Ferreira, Mario Da Silva Nunes, A. C. Mendes-Oliveira, I. Farias, R. Rossi

{"title":"Systematics of Neotropical Spiny Mice, Genus Neacomys Thomas, 1900 (Rodentia: Cricetidae), from Southeastern Amazonia, with Descriptions of Three New Species","authors":"Thiago Borges Fernandes Semedo, M. N. D. Da Silva, E. Gutiérrez, D. C. Ferreira, Mario Da Silva Nunes, A. C. Mendes-Oliveira, I. Farias, R. Rossi","doi":"10.1206/3958.1","DOIUrl":"https://doi.org/10.1206/3958.1","url":null,"abstract":"ABSTRACT Species of Neacomys are small cricetid rodents that occur in forested habitats of Central and South America, from eastern Panama to central Bolivia and central/western Brazil. In order to assess species diversity of this poorly known genus, we obtained cytochrome b gene sequences from the most comprehensive taxonomic and geographic sampling analyzed to date. We also conducted morphological analyses on a large series of specimens housed in 15 museums, including types of 10 out of 14 nominal taxa. Our analyses of the genetic data recovered 17 lineages clustered in four distinct clades. Among these lineages, 11 correspond to species currently recognized as valid, and the remaining six are putative new species. In southeastern Amazonia—the geographical scope of this report—four undescribed species were discovered, three of which are named herein: Neacomys marajoara, sp. nov., from the Island of Marajó, Pará state; Neacomys vossi, sp. nov., restricted to the Tapajós center of endemism (between the Tapajós and Xingu rivers); and Neacomys xingu, sp. nov., restricted to the Xingu center of endemism (between the Xingu and Araguaia/Tocantins rivers). The new species can be discriminated from other Neacomys species by the morphology of the nasal bones, zygomatic plate, interorbital region, subsquamosal fenestra, paraoccipital process, incisive foramina, auditory bullae, anterocone and anteroloph of the first upper molar, carotid circulation pattern, and karyotype. Our results substantially improve our understanding of the genus Neacomys by providing morphological, morphometric, and novel molecular insights about these poorly known rodents and demonstrate that the diversity of small Amazonian mammals is still poorly known, even in the relatively accessible southeastern part of the biome.","PeriodicalId":55527,"journal":{"name":"American Museum Novitates","volume":"2020 1","pages":"1 - 43"},"PeriodicalIF":1.5,"publicationDate":"2020-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66160930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Eomakhaira molossus, A New Saber-Toothed Sparassodont (Metatheria: Thylacosmilinae) from the Early Oligocene (?Tinguirirican) Cachapoal Locality, Andean Main Range, Chile Eomakhaira molossus，智利安第斯山脉Cachapoal地区渐新世早期的一种新的剑齿雀形目（Metatheria：Thylacosmilinae）

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-07-17 DOI: 10.1206/3957.1

Russell K. Engelman, J. J. Flynn, A. Wyss, D. Croft

{"title":"Eomakhaira molossus, A New Saber-Toothed Sparassodont (Metatheria: Thylacosmilinae) from the Early Oligocene (?Tinguirirican) Cachapoal Locality, Andean Main Range, Chile","authors":"Russell K. Engelman, J. J. Flynn, A. Wyss, D. Croft","doi":"10.1206/3957.1","DOIUrl":"https://doi.org/10.1206/3957.1","url":null,"abstract":"ABSTRACT Thylacosmiline sparassodonts (previously recognized as thylacosmilids) are among the most iconic groups of endemic South American Cenozoic mammals due to their distinctive morphology and convergent resemblance to saber-toothed placental carnivores. However, the early evolution of this group and its relationship to other sparassodonts remains poorly understood, primarily because only highly specialized Neogene taxa such as Thylacosmilus, Anachlysictis, and Patagosmilus are well known. Here, we describe a new Paleogene sparassodont, Eomakhaira molossus, from the Cachapoal locality of central Chile, the first sparassodont reported from early Oligocene strata of the Abanico Formation. Eomakhaira shares features with both Neogene thylacosmilines and Paleogene “proborhyaenids,” and phylogenetic analyses recover this taxon as sister to the clade of Patagosmilus + Thylacosmilus. This broader clade, in turn, is nested within the group conventionally termed Proborhyaenidae. Our analyses support prior hypotheses of a close relationship between thylacosmilines and traditionally recognized proborhyaenids and provide the strongest evidence to date that thylacosmilines are proborhyaenids (i.e, the latter name as conventionally used refers to a paraphyletic group). To reflect the internestedness of these taxa, we propose use of Riggs' (1933) original name Thylacosmilinae for the less inclusive grouping and Proborhyaenidae for the more inclusive one. Saber teeth arose just once among metatherians (among thylacosmilines), perhaps reflecting a developmental constraint related to nonreplacement of canines in metatherians; hypselodonty may have relaxed this potential constraint in thylacosmilines. The occurrence of Eomakhaira in strata of early Oligocene age from the Chilean Andes demonstrates that the stratigraphic range of thylacosmilines spanned almost 30 million years, far surpassing those of saber-toothed placental lineages.","PeriodicalId":55527,"journal":{"name":"American Museum Novitates","volume":"2020 1","pages":"1 - 75"},"PeriodicalIF":1.5,"publicationDate":"2020-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49070443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Reconstructing the Specimens and History of Howe Quarry (Upper Jurassic Morrison Formation; Wyoming) 重建豪采石场的标本和历史（怀俄明州上侏罗纪Morrison组）

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-06-24 DOI: 10.1206/3956.1

E. Tschopp, C. Mehling, M. Norell

{"title":"Reconstructing the Specimens and History of Howe Quarry (Upper Jurassic Morrison Formation; Wyoming)","authors":"E. Tschopp, C. Mehling, M. Norell","doi":"10.1206/3956.1","DOIUrl":"https://doi.org/10.1206/3956.1","url":null,"abstract":"ABSTRACT In 1934, Barnum Brown of the American Museum of Natural History in New York (AMNH) led a large-scale dinosaur excavation in northern Wyoming, where he had found bones two years earlier. Initially, Brown expected to excavate two skeletons of sauropod dinosaurs, but soon after opening the quarry, the team realized that the site far exceeded their expectations: in the end, they unearthed approximately 3000 bones within six months and sent approximately 144 crates back to the AMNH. Due to the enormous number of bones, the site became world famous as a dinosaur graveyard, and media from all over the United States and abroad reported on the expedition. Soon after, however, the collection shifted away from a curatorial focus. What followed was a history of neglect: inappropriate storage conditions, water and fire damage, collapsing wooden boxes, and deteriorating plaster jackets. Relocation and further excavation of the quarry by the Sauriermuseum Aathal (Switzerland; SMA) from 1989 to 1991 confirmed earlier finds of skin impressions and resulted in the recognition of a novel diplodocid sauropod: Kaatedocus siberi. Given that the amount of bones found by the AMNH far exceeded those found by the SMA, a new project was started in 2017 to reassess the state and scientific value of the historic collections at AMNH. Although most of the bones are heavily fragmented, preliminary results show that overall preservation is still exceptional. Here, we reconstruct the history of the excavation, as well as past conservation and preparation procedures, and provide a report of current efforts to prepare, conserve, and catalog the material that has remained in storage since the 1930s. These current efforts show that historic collections, even after decades of neglect, can be of great and unexpected value, both for research and scientific outreach.","PeriodicalId":55527,"journal":{"name":"American Museum Novitates","volume":"2020 1","pages":"1 - 56"},"PeriodicalIF":1.5,"publicationDate":"2020-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45613162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A Revision of Philander (Marsupialia: Didelphidae), Part 2: Phylogenetic Relationships and Morphological Diagnosis of P. nigratus Thomas, 1923 Philander（有袋动物：Didelphidae）的修订，第2部分：黑腹蛛的系统发育关系和形态学诊断Thomas，1923

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-06-24 DOI: 10.1206/3955.1

R. Voss, Thomas C. Giarla

引用次数: 3

A New Genus of Late Cretaceous Angel Shark (Elasmobranchii; Squatinidae), with Comments on Squatinid Phylogeny 晚白垩世天使鲨一新属;下蹲科)，并对下蹲科系统发育的评述

IF 1.5 3区环境科学与生态学

American Museum Novitates Pub Date : 2020-06-16 DOI: 10.1206/3954.1

J. Maisey, Dana J. Ehret, J. Denton

{"title":"A New Genus of Late Cretaceous Angel Shark (Elasmobranchii; Squatinidae), with Comments on Squatinid Phylogeny","authors":"J. Maisey, Dana J. Ehret, J. Denton","doi":"10.1206/3954.1","DOIUrl":"https://doi.org/10.1206/3954.1","url":null,"abstract":"ABSTRACT Three-dimensional Late Cretaceous elasmobranch endoskeletal elements (including palatoquadrates, ceratohyals, braincase fragments, and a series of anterior vertebrae) are described from the Late Cretaceous University of Alabama Harrell Station Paleontological Site (HSPS), Dallas County, Alabama. The material is referred to the extant elasmobranch Family Squatinidae on the basis of several distinctive morphological features. It also exhibits features not shared by any modern or fossil Squatina species or the extinct Late Jurassic squatinid Pseudorhina. A new genus and species is erected, despite there being some uncertainty regarding potential synonymy with existing nominal species previously founded on isolated fossil teeth (curiously, no squatinid teeth have been documented from the HSPS). A preliminary phylogenetic analysis suggests that the new genus falls on the squatinid stem, phylogenetically closer to Squatina than Pseudorhina. The craniovertebral articulation in the new genus exhibits features considered convergent with modern batomorphs (skates and rays), including absence of contact between the posterior basicranium and first vertebral centrum, and a notochordal canal which fails to reach the parachordal basicranium. Supporting evidence that similarities in the craniovertebral articulation of squatinoids and batomorphs are convergent rather than synapomorphic (as “hypnosqualeans”) is presented by an undescribed Early Jurassic batomorph, in which an occipital hemicentrum articulates with the first vertebral centrum as in all modern sharklike (selachimorph) elasmobranchs. The fossil suggests instead that the batomorph synarcual evolved by fusion of the anterior basiventral and basidorsal cartilages prior to the reduction of the anterior centra and loss of the occipital hemicentrum, not afterward as predicted by the hypnosqualean hypothesis.","PeriodicalId":55527,"journal":{"name":"American Museum Novitates","volume":"2020 1","pages":"1 - 29"},"PeriodicalIF":1.5,"publicationDate":"2020-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42135473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3