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1266 Projects

Media are grouped by projects created by users. Projects tend to contain media tied together by a theme. A project might represent the dataset for a single peer-reviewed paper, the results of a collections digitization project, or data for a digital lesson plan.

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Title Description Team Creator Media Objects
Display all details of A new medium-sized moradisaurine captorhinid eureptile from the Permian of Mallorca (Balearic Islands, western Mediterranean) and correlation with the co-occurring ichnogenus Hyloidichnus 5 2
Display all details of Barbourofelid sabertooth Oriensmilus liupanensis Wang, X., S.C. White, and J. Guan. 2020. A new genus and species of sabretooth, Oriensmilus liupanensis (Barbourofelinae, Nimravidae, Carnivora), from the middle Miocene of China suggests barbourofelines are nimravids, not felids. Journal of Systematic Palaeontology 18(9):783-803. Abstract. Since the early 2000s, a revival of a felid relationship for barbourofeline sabretooths has become popular due to recent discoveries of fragmentary fossils from Africa. According to this view, barbourofelines trace their common ancestor with felids through shared similarities in dental morphology going back to the early Miocene of Africa and Europe. However, whether or not such an idea is represented in the basicranial morphology, a conservative area of high importance in family-level relationships, is yet to be tested. A nearly complete skull of Oriensmilus liupanensis gen. and sp. nov. from the middle Miocene Tongxin Basin of northern China represents the most primitive known barbourofeline with an intact basicranial region, affording an opportunity to re-examine the relationship of felids and nimravines. We also present an update on East Asian records of barbourofelines. The new skull of Oriensmilus possesses a suite of characters shared with nimravines, such as the lack of an ossified (entotympanic) bullar floor, absence of an intrabullar septum, lack of a ventral promontorial process of the petrosal, presence of a small rostral entotympanic on the dorsal side of the caudal entotympanic, and a distinct caudal entry of the internal carotid artery and nerve that pierces the caudal entotympanic at the junction of the ossified and unossified caudal entotympanics. The absence of an ossified bullar floor in O. liupanensis and its presence in those from the middle Miocene of Sansan, France thus help to bracket the transition of this character, which must have happened in the early part of the middle Miocene. Spatial relationships between bullar construction and the middle ear configuration of the carotid artery in Oriensmilus strongly resemble those in nimravines but are distinctly different from felids and other basal feliforms. Despite the attractive notion that early barbourofelines arose from a Miocene ancestor that also gave rise to felids, the basicranial evidence argues against this view. Xiaoming Wang 1 1
Display all details of Bone-cracking Borophagus coprolites Wang, X., S.C. White, M. Balisi, J. Biewer, J. Sankey, D. Garber, and Z.J. Tseng. 2018. First bone-cracking dog coprolites provide new insight into bone consumption in Borophagus and their unique ecological niche. eLife 7:e34773. Abstract. Borophagine canids have long been hypothesized to be North American ecological ‘avatars’ of living hyenas in Africa and Asia, but direct fossil evidence of hyena-like bone consumption is hitherto unknown. We report rare coprolites (fossilized feces) of Borophagus parvus from the late Miocene of California and, for the first time, describe unambiguous evidence that these predatory canids ingested large amounts of bone. Surface morphology, micro-CT analyses, and contextual information reveal (1) droppings in concentrations signifying scent-marking behavior, similar to latrines used by living social carnivorans; (2) routine consumption of skeletons; (3) undissolved bones inside coprolites indicating gastrointestinal similarity to modern striped and brown hyenas; (4) B. parvus body weight of ~24 kg, reaching sizes of obligatory large-prey hunters; and (5) prey size ranging ~35–100 kg. This combination of traits suggests that bone-crushing Borophagus potentially hunted in collaborative social groups and occupied a niche no longer present in North American ecosystems. Xiaoming Wang 24 12
Display all details of Giant otter Siamogale melilutra Otters (subfamily Lutrinae) are semi-aquatic predators in the family Mustelidae. Modern otters have a worldwide distribution but their fossil record is poor, often consisting of fragmentary jaws and teeth. Multiple lineages have developed bunodont dentitions with enlargements of molars, usually for cracking mollusks or other hard foods. Some lineages have evolved badger-like teeth and, as a result, were often confused with melines (Old World badger clade). Siamogale thailandica Ginsburg et al., 1983 from the middle Miocene basin of Mae Moh in northern Thailand is one such species, whose fragmentary dental remains have thus far impeded our understanding. A new species of fossil otter, Siamogale melilutra, represented by a nearly complete cranium, mandible, and partial skeletons of at least two individuals, was recovered from the latest Miocene (~6.2 Ma) lignite beds of the Shuitangba Site in northeastern Yunnan Province, southwestern China. CT restoration of the crushed skull reveals a combination of otter-like and badger-like cranial and dental characteristics. The new species belongs to the Lutrinae because of its possession of a large infraorbital canal and ventral expansion of the mastoid process, among other traits. A distally expanded M1, however, gives an appearance of badgers. In overall morphology the Shuitangba otter is closest to Siamogale thailandica. A previously described jaw (“Lutra” aonychoides) from the early Pliocene of the Yushe Basin in north China is also here referred to S. melilutra. No previous attempt has been made to provide a global phylogenetic framework for otters. We present the first combined morphological and molecular (nuclear and mitochondrial DNAs) character matrices of five extant (Pteronura, Lontra, Enhydra, Aonyx, Lutra) and eight extinct genera (Tyrrhenolutra, Paralutra, Paludolutra, Enhydritherium, Siamogale, Vishnuonyx, Sivaonyx, Enhydriodon) to better understand the evolution of bunodont otters. Parsimony and Bayesian analyses consistently recover an eastern Asian clade that includes forms from Shuitangba, Yushe, and Mae Moh, all of which are referred to Siamogale. Xiaoming Wang 2 1
Display all details of Janavis finalidens Morphology All skeletal elements from the ornithurine Janavis finalidens Benito, Juan 41 1
Display all details of E. orbis juvenile Juvenile fish used in modeling for "It pays to be bumpy: drag reducing armor in the Pacific spiny lumpsucker, Eumicrotremus orbis" Hoover et al. in press. R.C. Hoover 1 1
Display all details of Primitive Tibetan antelope, Qurliqnoria hundesiensis (Lydekker, 1881) (Bovidae, Artiodactyla), from Pliocene Zanda and Kunlun Pass basins and paleoenvironmental Wang, X., Q. Li, and Z. J. Tseng. 2022. Primitive Tibetan antelope, Qurliqnoria hundesiensis (Lydekker, 1881) (Bovidae, Artiodactyla), from Pliocene Zanda and Kunlun Pass basins and paleoenvironmental implications. Journal of Mammalian Evolution 30(1): 245-268. Abstract: Well adapted to extremely cold winters (hypothermia) and low oxygen (hypoxia), the Tibetan antelope (or chiru), Pantholops hodgsonii Abel, is an iconic species in the Tibetan Plateau. Its extinct relative, Qurliqnoria Bohlin, represents the earliest endemic Tibetan mammal going back to the late Miocene, suggesting a long process of adaptations within Tibetan Plateau for ~ 10 million years. We reexamine holotype materials of Q. hundesiensis (Lydekker) from the British Museum, originally discovered by British explorers in the Himalayas in the early 1800s, and new materials recently discovered in the Pliocene strata of Zanda Basin, southwestern Tibet. We refer additional horncore and dental materials from the Kunlun Pass Basin at 4,700–4,900 m asl, and leverage these new data to place Q. hundesiensis within modern biostratigraphic and paleoenvironmental frameworks. Although Qurliqnoria remains the best candidate of a distant sister-group of living Pantholops, the Pliocene representatives offer no sign of transitions to living chiru. We infer that the Qurliqnoria lineage has persisted throughout late Miocene and Pliocene of the Tibetan Plateau in a chronospecies succession, i.e., Q. cheni to Q. hundesiensis. The Pliocene Qurliqnoria probably did not directly give rise to Pantholops, suggesting that a direct ancestor of Pantholops is yet to be found. We discuss the paleoenvironmental and paleoelevational implications of the new Qurliqnoria materials and analysis for Tibetan Plateau faunal evolution. Xiaoming Wang 9 9
Display all details of Fast spread followed by anagenetic evolution in Eurasian and North American Amphimachairodus Wang, X., O. Carranza-Castañeda, and Z. J. Tseng. 2022. Fast spread followed by anagenetic evolution in Eurasian and North American Amphimachairodus. Historical Biology 35(5): 780-798. Abstract: The charismatic sabertooth cat Amphimachairodus has numerous but largely fragmentary records across late Miocene deposits of Africa, Eurasia and North America. The genus has a complex taxonomic history, and the majority of Amphimachairodus materials come from isolated localities, often studied without stratigraphic context. Here we analyze the long, continuous records from the classic Chinese Baode strata, which produce Amphimachairodus throughout the section, and demonstrate that an A. palanderi-horribilis chronospecies succession represents a continuum of in situ anagenetic evolution of increasing size. We then synthesize chronological occurrences of Amphimachairodus from all Holarctic records and reframe their evolution as a case of chronospecies succession. Two parallel anagenetic lineages are evident: a Eurasian A. giganteus-palanderi-horribilis chronospecies succession and second, a North American A. coloradensis-alvarezi chronospecies succession following an immigration event in the early Hemphillian. In addition to greater hypercarnivory evidenced by dental specialization, the Eurasian lineage shows a trend toward large body size whereas the North American lineage decreases in size. We take this opportunity to describe materials of Amphimachairodus alvarezi from Yepómera (latest Hemphillian) in the state of Chihuahua, Mexico and previously undescribed materials from San Miguel de Allende Basin. We review taxonomic status of Chinese A. horribilis and related taxa. Xiaoming Wang 2 2
Display all details of Ambulator keanei SAMA P54742 Jacob van Zoelen 74 1
Display all details of Eoarctos vorax a basal arctoid from North Dakota An exquisitely preserved skeleton (USNM 637259) of a basal ursoid is the basis of a monograph in Journal of Vertebrate Paleontology Memoir. The following is an abstract: An exquisitely preserved male skeleton of an early arctoid, Eoarctos vorax new genus and species, provides a unique window into the origin and early divergence of Carnivora. Recovered from the Fitterer Ranch locality in the early Oligocene (Orellan to Whitneyan North American Land Mammal ages) Brule Formation of southwestern North Dakota (~32 Ma), the new arctoid offers an opportunity to evaluate the fundamental relationships of the caniform (dog-like) carnivorans. Eoarctos vorax possesses a suite of plesiomorphic characters inherited from its miacid ancestors, making it an ideal model for ancestral arctoids. We present a comprehensive treatment of E. vorax, combining traditional description with photographic documentation, modern microCT, laser scans, and photogrammetry.Showing its plesiomorphic morphology, Eoarctos vorax is scansorial in locomotion, somewhat like a modern raccoon, retaining the ability to climb trees and lacking cursorial adaptations present in the early canid Hesperocyon. However, E. vorax shows clear signs of durophagous cranio-dental adaptations, presumably for an obligatory diet of mollusks, and frequent damage to shell-crushing premolars, plus associated dental infections.We review several other key North American early arctoids and present total-evidence (nuclear DNA and discrete morphological characters) Bayesian and parsimony analyses of Caniformia phylogeny, including extinct stem taxa plus a living member of all modern families. We recognize an endemic North American ursoid clade, family Subparictidae, which includes Eoarctos vorax as its most derived member. We demonstrate the importance of North America as an early cradle of evolution for caniform carnivorans, including early precursors of Canidae, Amphicyonidae, Ursidae, and Pinnipedia. Xiaoming Wang 113 1
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