Megamouth Shark Morphometrics
Krak and Shimada use geometric morphometrics to reconstruct extinct megamouth shark tooth rows
Allonia from the middle Cambrian Wheeler Formation of Utah
Foster, Howells and Sroka report new details of early sponge-like animals from a spectacularly-preserved specimen from the Cambrian of western Utah.
Death Valley Devonian Acanthodians
A new stem chondrichthyan fauna from the Lost Burro Formation of California by Carole J. Burrow and David K. Elliot.
Toxochelys latiremis Cope, 1873
First report of this turtle from the Cretaceous of Alabama, USA by Andrew Gentry and Jun Ebersole.
Calliovarica oregonensis Hickman
A new species of chilodontid gastropod from the Eocene of Oregon, USA by Carole S. Hickman.
An EPICC contribution!
Annotated list of the Cenozoic marine formations of the Pacific Northwest by Liz Nesbitt.
Use of machine learning to classify extant apes!
Monson et al. apply machine learning using dental morphology to classify extant apes and shed light on the chimpanzee-human last common ancestor.
New subadult skull specimen of Euclastes wielandi Hay, 1908 from the Cretaceous of New Jersey, USA!
New study of a subadult skull by P. Ullmann, Z. Boles and M. Knell provides insights into the cranial morphology and intraspecific variation in the Cretaceous pan-cheloniid turtle Euclastes wielandi.
Cimolestids (Mammalia) from the Paleocene of Montana!
New report on Puercolestes and Betonnia, two cimolestids from the early Paleocene (Puercan) of northeastern Montana, U.S.A. by William A. Clemens.
Eocene cassid gastropods from North America!
A reassessment by Richard Squires of Eocene warm-water cassid gastropods (Family Cassidae) from North America and implications for their paleogeographic distribution and faunal turnover following the Paleocene-Eocene Thermal Maximum.
Late Eocene elasmobranchs from Aiken County, South Carolina, USA!
Cicimurri and Knight describe new material of sharks and rays (elasmobrachs) from the Dry Branch Formation of Aiken County, South Carolina USA.
Nestling-sized hadrosaurine crania from the Late Cretaceous of Montana!
Wosik et al. describe new cranial remains of hadrosaurine nestlings from the Late Cretaceous Hell Creek Formation, Montana, USA, with analysis of cranial ontogeny in Edmontosaurus annectens.
Miocene macropaleontology of the Caldecott Tunnel fourth bore excavation, Berkeley Hills, CA, USA!
Powell et al. describe Miocene marine macrofossils recovered from the fourth bore excavation of the Caldecott Tunnel in the Berkeley Hills, Oakland, CA, USA.
New protocol for differentiating leporids from the late Quaternary of southern California, USA!
Fox et al. propose new protocol using dental morphology for identifying late Quaternary leporids from southern California with remarks on lagomorphs from Rancho La Brea's Project 23!
A new drepanosauromorph from the Chinle Formation of Petrified Forest National Park, Arizona, USA!
Gonçalves and Sidor describe the new Triassicdrepanosauromorph genus and species,Ancistronychus paradoxus, from the Chinle Formation of the Petrified Forest National Park, Arizona, USA!
Epiplastral shape and geographic variation of Echmatemys from the Eocene of Utah!
Heather F. Smith et al. analyze epiplastral shape and geographic variation in thegeoemydid turtle, Echmatemys,from the Eocene Uinta Basin , Utah, USA.
The new species Lyropecten terrysmithae from the Miocene of central California!
Powell et al. describe and name a new pectinid, Lyropecten terrysmithae , from the Miocene of California in honor of Dr. Judy Terry Smith for her work on California and Mexican invertebrate paleontology.
Faunal change in Cretaceous endemic bivalves of the northeast Pacific!
Richard Squires reports on the faunal change in Cretaceous shallow-marine endemic bivalve genera/subgenera of the northeast Pacific region.
New report of the fossil otolith species, Equetulus silveraldensis n. comb., from the Oligocene of the Gulf Coastal Plain, USA!
Stringer et al. describe the first record of the teleostean fish otolith, Equetulus silveraldensis n. comb., from the Oligocene of Alabama, USA, and its enigmatic geographic distribution.
New dinosauromorph body fossils from the Petrified Forest National Park, Arizona, USA!
Adam Marsh and William Parker describe new dinosauromorph specimens from the Chinle Formation Petrified Forest National Park and provide a global biostratigraphic review of Triassic dinosauromorphs.
Checklist of Paleogene-Neogene marine Mollusca from California!
Groves and Squires present an annotated catalog of Paleogene-Neogene Mollusca from California since Keen and Bentson's 1944 checklist.
New mid-Miocene equids from the Cajon Valley Formation, CA!
Stoneburg et al. describe new fossil horse remains from the mid-Miocene of San Bernardino County, CA.
New fossil fishes from South Carolina, USA!
Cicimurri et al. report on a diverse fauna of Oligocene fishes from the Ashley Formation of South Carolina, with description of a new catshark species, Scyliorhinus weemsi.
Changes in southern California oyster paleocommunity structure over the last 3.6 million years!
Bonuso et al. use digitized data from the EPICC TCN and other sources to reconstruct Late Cenozoic oyster communities in southern California, USA.
The earliest Ancistrolepis, from the early Eocene of Simi Valley, California, USA
Squires updates our knowledge of the oldest species of this extant buccinid gastropod genus
The first Cretaceous fish otolith assemblage from the Arkadelphia Formation of Arkansas, USA!
Stringer and Sloan describe the first otolith assemblage from the Late Cretaceous of Arkansas and its implications for our understanding of the Western Interior Seaway.
Pteriomorph bivalves from the Eocene-Oligocene Keasey Formation in Oregon, USA!
Hickman describes the pteriomorph bivalves from the Eocene-early Oligocene Keasey Formation in Oregon, recognizing a new peri-seep biotope association.
Volume 40, Issue 10, 2023
Articles
Revision of northeast Pacific Paleogene cypraeoidean gastropods (Mollusca), including recognition of three new species: Implications for paleobiogeographic distribution and faunal turnover
The Paleogene cypraeoidean fauna of the northeast Pacific region (NEP), extending from Vancouver Island, British Columbia, Canada southward to Baja California Sur, México, consists of 12 genera, 20 named species (three of which are new), six open-nomenclature species, one Cypraeidae, indeterminate to genus and species, one cf. species, and four nomina dubia. All taxa are figured here. Species reassigned at the genus level are Protocypraea? simiensis (Nelson, 1925) and Luponovula maniobraensis (Squires and Advocate, 1986). Improved documentation of known NEP species include Propustularia kemperae (Nelson, 1925), Grovesia castacensis (Stewart, 1926) [1927]), G. mathewsonii (Gabb, 1864), and Eratotrivia crescentensis (Weaver and Palmer, 1922). The three new species, Subepona leahae, Bernaya kaylinae, and Eocypraea judithsmithae are from the upper lower Eocene Llajas Formation of Simi Valley, Ventura County and Devil Canyon, Los Angeles County, California. Six open-nomenclature species need better preserved material; they are: Bernaya sp., two Protocypraea? sp., Gisortia sp., Eocypraea sp., and Cypraedia sp., as does an indeterminate cypraeid from the Lodo Formation of central California. Nomina dubia are “Bernaya” fresnoensis (Anderson, 1905), “Eocypraea” bayerquei (Gabb, 1864), “Sphaerocypraea” martini (Dickerson, 1914), and “Sulcocypraea” oakvillensis (Van Winkle, 1918). Eratotrivia mackini (Durham, 1944) is herein reassigned to the synonymy of Grovesia mathewsonii (Gabb, 1869). The NEP Paleocene cypraeoidean fauna consists of four genera, a cypraeid of unknown generic affinity, and two nomina dubia. The early Eocene “Capay Stage” cypraeoidean fauna is comprised of eight genera and two nomina dubia. That was during the peak of NEP cypraeoidean biodiversity, which coincided with the “Early Eocene Climate Optimum” (EECO), the warmest time of the Paleogene. At the end of “Capay” time, biodiversity abruptly decreased, and this trend continued to the end of “Domengine Stage” time, when a faunal turnover took place. The cypraeoidean faunas in the subsequent “Tejon Stage” and Galvinian Stage continued to be diminished because of the ongoing cooling of the ocean waters. Continued global cooling eventually caused the disappearance of the thermophilic Paleogene NEP cypraeoideans before the beginning of the Oligocene. Most of the NEP cypraeoidean fauna is very similar morphologically to species found in the Tethys region of Europe, especially France, Italy, and Ukraine. These similar species are indicative that the introduction of most of the NEP cyraeoidean genera into the NEP region was via a westward-directed, warm-water current originating in the ancient Tethys Sea region of western Europe. The point of origin of the Paleocene Propustularia is unknown, and the late Eocene Nuceolaria most likely arrived in the NEP region via a Pacific Ocean route.