AMNH Library Digital Repository
The AMNH Library Digital Repository is an archive maintained by the Research Library for AMNH Scientific Publications, AMNH scholarly output and other original and published materials digitized by the Library. All information in the repository is freely accessible to scholars around the world to support their research.
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Recent Submissions
From Bac to Orayvi : the ethnographic entradas of Francisco Garcés, 1768–1776 (Anthropological papers of the American Museum of Natural History, number 107)
(American Museum of Natural History., 2025-07-11) Whiteley, Peter M.
From 1768–1776, Francisco Garcés, O.F.M., undertook a series of “entradas” (explorations) into Native nations and territories throughout modern Arizona, Sonora, and the Californias. Mostly alone in Native company, he was guided from one settlement to the next, learning interrelationships, languages, and aspects of traditional knowledge. Much of Garcés’s work is unavailable in translation, and extant publications (whether in transcription, translation, or both) are largely uninformed by the ethnographic record. Focusing on two little-known accounts, this volume seeks to interpret Garcés’s ethnography in its pertinent historical contexts. The main document is a preliminary report (the “Noticias del Diario”) of his 1775–1776 entrada, compiled four months before the final diary. This report built upon his entradas of 1768–1774, summarized in another report (the “Noticias Sacadas”) immediately prior to the final expedition. Both reports, with related letters and accounts, are presented here in their original Spanish, interleaved with English translations. Ethnographic and historical annotations are interspersed, while Garcés’s routes are charted with historical and new maps. An appendix untangles documentary chronology (including via watermarks), and a second reconstructs his routes in detail. In all, Garcés visited more than 30 nations of three distinct language families. His observations at Hopi, among River Yumans, Takic, Yokuts, Numic, and Pai peoples, give often unique glimpses of Indigenous American societies at this period. Garcés was an ethnographer avant la lettre, learning directly from Native interlocutors. His work represents the dialogical precipitate and indirect transmission of some Native knowledge and practices within a large region of southwestern North America.
Supplemental Material for 'The modular organization of the trilobite head in Ceraurus pleurexanthemus'
(2025) Vargas-Parra, Ernesto E.; Hopkins, Melanie J.
Supplemental Material for Vargas-Parra, E. E. and Hopkins, M. J. (2025) The modular organization of the trilobite head in Ceraurus pleurexanthemus. Palaeontology. https://doi.org/10.1111/pala.70013.
Materials include landmark data, R-script, and associated files for modularity analyses of Ceraurus pleurexanthemus.
New cranial and postcranial remains of the once enigmatic early Eocene mammal Wyolestes (Mammalia, Ferae, Hyaenodonta) from North America and phylogenetic evidence for its interordinal relationships (Bulletin of the American Museum of Natural History, no. 475)
(American Museum of Natural History., 2025-06-24) Zack, Shawn P.; Rose, Kenneth David, 1949-; O'Leary, Maureen A.
Wyolestes is an extinct placental mammal from early Eocene (Wasatchian) rocks of North America whose phylogenetic position has been enigmatic for decades. Known from three species with distinct, high-cusped molars, the genus has been difficult to assign to a higher clade within Placentalia in part because it has, until now, been known primarily from dentitions. Here we describe new postcranial material of Wyolestes iglesius; new cranial, dental, and postcranial material, including both axial and appendicular elements, of W. apheles; and new postcranial and dental material of W. dioctes. Examining the phylogenetic position of Wyolestes in a character-dense, total evidence matrix that sampled extant and extinct taxa across Mammalia, reveals that Wyolestes is the sister taxon of the hyaenodont Sinopa, a clade we refer to here as Hyaenodonta. This finding revives a phylogenetic attribution first proposed by Gazin over 60 years ago. Wyolestes is phylogenetically distant from both mesonychids and didymoconids, a result with strong jackknife support. The hyaenodont clade is sister to Carnivoraformes and nested within Ferae. Inclusion of Wyolestes in a more focused phylogenetic analysis with dense sampling of early Ferae supports placement of Wyolestes within Hyaenodonta. A third analysis of early hyaenodonts indicates that the two Wyoming species, W. apheles and W. dioctes are sister taxa with respect to the Baja California species, W. iglesius. Skull material of W. apheles indicates the first known presence of an ossified tentorium cerebelli in Wyolestes, a fragile feature whose preservation is significant because it has been cited as a synapomorphy of Ferae, and is known in Carnivora, Pholidota, and their fossil relatives as well as in Hyaenodonta. The postcranial skeleton reveals that Wyolestes was a relatively generalized Paleogene mammal. Body mass estimates using extant Carnivora as an analog indicate that all species of Wyolestes weighed less than 10 kg and two species less than 5 kg. Wyolestes lacked derived climbing abilities. Nor does the postcranial skeleton indicate that it was semifossorial, but it suggests it may have had more of a tendency toward scratch digging. The postcranial skeletons exhibit many generalized features such as a deltopectoral crest that extends at least halfway down the shaft of the humerus, and the presence of an entepicondylar foramen, as well as the likely presence of a centrale in the manus. For skeletal elements that can be directly compared, such as the humerus, W. apheles is more robust than W. iglesius. Dental morphology indicates a sister taxon relationship between W. apheles and W. dioctes to the exclusion of W. iglesius.
A multigene phylogeny for Oecomys (Rodentia, Cricetidae, Sigmodontinae) with descriptions of new and revalidated taxa and a partial species-group classification (American Museum novitates, no. 4038)
(American Museum of Natural History., 2025-06-19) Voss, Robert S.; Giarla, Thomas C.; Lim, Burton K.; Engstrom, Mark D.
We report phylogenetic analyses of a multigene dataset for 24 species of the Neotropical cricetid genus Oecomys, including one new species from western Amazonia (O. hiceae) and a revalidated trans-Andean species (O. trabeatus). In addition, we analyze sequence data from four species that have not previously been included in any molecular analysis (O. flavicans, O. phaeotis, O. speciosus, and O. trinitatis sensu stricto) and from historical specimens of O. concolor (a species represented in previous analyses by sequences of problematic homology). Our results provide strong support for a monophyletic Rutilus Group (including O. hiceae, O. rutilus, O. trabeatus), a Bicolor Group (O. bicolor, O. cleberi, O. nanus, O. jamari, O. phaeotis), and a Mamorae Group (O. franciscorum, O. mamorae). We tentatively recognize two other clades that are less strongly supported by our analytic results but that seem to merit heuristic recognition: a Concolor Group (O. concolor, O. speciosus) and a Trinitatis Group (O. catherinae, O. flavicans, O. matogrossensis, O. rex, O. trinitatis). Future taxonomic progress will require sequence data from additional genes, revisionary studies of still problematic species (e.g., O. bicolor, O. trinitatis), and fresh collections from hitherto poorly surveyed regions.
A new species of Marmosa (Mammalia, Didelphimorphia, Didelphidae) from Parque Nacional del Río Abiseo, Peru (American Museum novitates, no. 4037)
(American Museum of Natural History., 2025-06-19) Pavan, Silvia E.; Abreu, Edson F.; Sánchez-Vendizú, Pamela Y.; Voss, Robert S.
We describe a new species in the didelphid marsupial genus Marmosa based on a single specimen collected at 2664 m on the eastern side of the Andes in San Martín department, Peru. The new species is closely related to Marmosa lepida (Thomas, 1888) and M. andersoni Pine,1972, in the subgenus Stegomarmosa, but differs from these and other congeneric taxa by mitochondrial and nuclear DNA sequences and by unique external and cranial characters. Diagnostic morphological traits of the new species include gray-based buffy-reddish ventral fur without a midventral zone of self-whitish fur; a remarkably narrow and long rostrum with a very long premaxillary process; absence of postorbital processes; and presence of diastemata among the canines, first premolars, and second premolars in both upper and lower dentitions. Marmosa chachapoya, sp. nov., is one of several recently discovered new species from the Parque Nacional del Río Abiseo, a protected area with remarkably high mammalian diversity.