David S Berman

David S Berman
Carnegie Learning Museum of Natural History

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110
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Publications

Publications (110)
Article
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An incomplete skeleton of a small tetrapod from the Upper Pennsylvanian of New Mexico represents a new genus and species of varanopid eupe-lycosaur named Eoscansor cobrensis. This skeleton is from the Cobrean (Virgilian) interval of the El Cobre Canyon Formation in the Cañon del Cobre of Rio Arriba County, New Mexico. Eoscansor is a small varanopid...
Article
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The braincase anatomy of the Pennsylvanian diadectomorph Limnoscelis dynatis is described in detail, based upon high-resolution X-ray microcomputed tomography. Both supraoccipitals and most of the prootics and opisthotics are preserved. The known portions of the left prootic, opisthotic, and supraoccipital enclose complete sections of the endosseou...
Article
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A comprehensive description of the holotype skeleton is presented here for the first time of the lower Permian (Artinskian) reptile Eudibamus cursoris from the Bromacker locality of Germany since the brief description of the holotype in 2000. The holotype is essentially complete and is the only known bolosaurid represented by a well-preserved artic...
Article
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A new skeleton of the exceedingly rare, late Carboniferous eureptile Anthracodromeus longipes (Carroll and Baird, 1972), reveals the presence of a reduced phalangeal count in the manus and pedes and uniquely recurved unguals. With these data, we quantitatively evaluate the locomotor ecology of Anthracodromeus using morphometric analyses of the phal...
Article
The dissorophid genus Conjunctio (Temnospondyli) is poorly characterized, known only from two incomplete specimens from the upper El Cobre Canyon Formation (lower Permian), Cutler Group, New Mexico, U.S.A. Nonetheless, the taxon’s conserved morphology and stratigraphic occurrence near the Carboniferous–Permian boundary (ca. 299 million years ago) m...
Article
The Carboniferous–Permian (C–P) Cutler Group in southeastern Utah archives large‐scale environmental changes along multiple facies belts, including major sea‐level changes and continental aridification that intensified into earliest Permian times. Nevertheless, the stratigraphical position of the C–P boundary within the Cutler Group has been poorly...
Article
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A new genus and species of a basal synapsid Caseidae, Martensius bromackerensis, is described based on four partial to nearly complete mostly articulated skeletons that provide a comprehensive knowledge of the skeletal morphology. All four specimens were collected from a single site, the Bromacker quarry, in the Lower Permian Artinskian Tambach For...
Article
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A detailed anatomy of the braincase and stapes of the subadult specimen of Diadectes absitus from early Permian sediments of Germany are described for the first time based on the high‐resolution X‐ray microcomputed tomography. In contrast to previous studies of Diadectes, the bones of the braincase (opisthotic, prootic, supraoccipital, basioccipita...
Article
The origin of amniotes was a key event in vertebrate evolution, enabling tetrapods to break their ties with water and invade terrestrial environments. Two pivotal clades of early tetrapods, the diadectomorphs and the seymouriamorphs, have played an unsurpassed role in debates about the ancestry of amniotes for over a century, but their skeletal mor...
Article
The Carboniferous-Permian (C-P) transition records a shift in the composition and environmental setting of tropical flora and vertebrate assemblages across western and central Pangea. Here we report the discovery of a rare, multitaxic bonebed in the lower Halgaito Formation (Cutler Group) in Valley of the Gods and its vicinity (San Juan County), so...
Article
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The lower Permian Yeso Group records arid coastal plain, shallow marine and evaporitic deposition across much of central New Mexico during Leonardian time. Generally considered to have few fossils, recent study of Yeso Group strata has uncovered a diverse fossil record of marine microorganisms (mostly algae and foraminiferans), terrestrial plants a...
Article
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The Lower Permian Dunkard Group has yielded a sparse record of tetrapod footprints that are assigned to the ichnogenera Dimetropus Romer and Price, 1940, Dromopus Marsh, 1894, and Limnopus Marsh, 1894. We report two new occurrences of Dimetropus that significantly extend its strati-graphic range in the Dunkard Group to the Washington and Greene for...
Article
Studies of dinosaur teeth have focused primarily on external crown morphology and thus, use shed or in situ tooth crowns, and are limited to the enamel and dentine dental tissues. As a result, the full suites of periodontal tissues that attach teeth to the jaws remain poorly documented, particularly in early dinosaurs. These tissues are an integral...
Article
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We describe the lithostratigraphy, sedimentary petrography and vertebrate paleontology of the thickest known (~ 400 m thick) section of the Lower Permian Abo Formation, which is in the northern Sacramento Mountains of Otero County, New Mexico. This Abo section differs from other sections of the formation in its great thickness, lack of a clear subd...
Chapter
The Early Permian amniote Oedaleops is generally considered to be one of the basalmost pelycosaurian-grade synapsids. Thus it occupies a key position for understanding the phylogenetic relationships of basal synapsids specifically and basal amniote interrelationships more generally. This assessment has until now been based almost exclusively on the...
Chapter
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A new genus and species of varanodontine varanopid, Tambacarnifex unguifalcatus, is described on the basis of the greater portion of the postcranium and a closely associated partial left dentary from the Lower Permian (Wolfcampian) Tambach Formation, the lowermost unit of the Upper Rotliegend, of the Bromacker locality in the midregion of the Thuri...
Article
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Un crâne et un squelette partiel d’amphibien de la formation El Cobre Canyon au Nouveau-Mexique (États-Unis) ont été identifiés comme appartenant au genre Broiliellus, temnospondyle dissorophoïdé. Les traits significatifs sont les suivants : une région pré-orbitale relativement longue et étroite, avec à la fois des nasaux et des vomers moitié moins...
Article
Abstract—In central New Mexico, the Lower Permian (middle-upper Wolfcampian) Abo Formation generally overlies the Upper Pennsylvanian (Newwellian) Bursum Formation disconformably and is conformably overlain by the Lower Permian (Leonardian) Yeso Group. The Abo Formation is 100-309 m thick and can be divided into two members: (1) lower, Scholle Memb...
Article
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The taxonomic validity of the eryopid temnospondyl Glaukerpeton avinoffi Romer, 1952, from the Upper Pennsylvanian Conemaugh Group of North America is confirmed on the basis of a detailed restudy of two specimens: the holotype, based on a partial skull roof from Pittsburgh, Pennsylvania; and the skull and postcranial material of a second specimen f...
Article
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In the Jemez Springs area of Sandoval County, northern New Mexico, siliciclastic redbeds of the upper Paleozoic Abo Formation are well exposed and yield fossil plants and vertebrates. The local Abo Formation section is more than 190 m thick and rests disconformably on the Upper Pennsylvanian Guadalupe Box Formation and is conformably overlain by th...
Article
Abstract—in the fra Cristobal and Caballo mountains of Sierra County, new mexico, the lower permian (middle-upper wolfcampian) abo formation disconformably overlies the Upper pennsylvanian (newwellian) bursum formation or middle-Upper pennsylvanian (Desmoinesian-Virgilian) bar b formation and is conformably overlain by the lower permian (leon-ardia...
Article
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Rotaryus gothae, a new genus and species of trematopid temnospondyl amphibian, is described on the basis of a single specimen from the Lower Permian (Wolfcampian) Tambach Formation, lowermost formational unit of the Upper Rotliegend Group or Series of the Bromacker locality in the midregion of the Thuringian Forest, central Germany. This is only th...
Article
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Tambaroter carrolli is a new genus and species of medium-sized ostodolepid ‘microsaur’ from the Lower Permian Tambach Formation, lowermost formational unit of the Upper Rotliegend, Thuringia, central Germany. Based on a single skull, it is the first ‘microsaur’ to be described from this formation and the first vertebrate fossil known from the Tamba...
Article
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The oldest theropod dinosaurs are known from the Carnian of Argentina and Brazil. However, the evolutionary diversification of this group after its initial radiation but prior to the Triassic-Jurassic boundary is still poorly understood because of a sparse fossil record near that boundary. Here, we report on a new basal theropod, Daemonosaurus chau...
Article
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Fedexia striegeli, a new genus and species of trematopid temnospondyl amphibian, is described on the basis of a single specimen that includes the greater portion of the skull and articulated portions of both mandibles and the atlas-axis complex, The holotype was collected from Upper Pennsylvanian—early Virgilian strata assignable to the lower part...
Article
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The snout region of a large dissorophoid skull (CM 76873) is described from the Upper Pennsylvanian El Cobre Canyon Formation of Cañon del Cobre, north-central New Mexico. The following characters are variably attributable to a wide variety of dissorophoids: 1) large size (skull length about 20 cm); 2) premaxilla massive with large dorsal exposure;...
Article
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Sphenacodon is a pelycosaurian-grade synapsid, best known from the Lower Permian of Rio Arriba County, northern New Mexico. Of the two species (S. ferox and S. ferocior), S. ferox is known from comparatively little skull material, and the skulls historically assigned to the taxon are heavily reconstructed and composed of few actual cranial elements...
Article
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A new genus and species of the herbivorous Diadectidae, Orobates pabsti, is described on the basis of several specimens, including two complete, articulated skeletons, a skull with partial postcranium, a partial skull, and a dentigerous jaw fragment. All were collected from the Lower Permian (Wolfcampian) Tambach Formation, lowermost formational un...
Article
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An articulated partial skeleton, including a nearly complete skull and left forelimb, of a crocodylomorph reptile from the Upper Triassic Chinle Formation of Ghost Ranch, New Mexico, is referable to Hesperosuchus agilis Colbert, 1952. It contributes much new information on the skeletal structure of this previously poorly known taxon. A large, circu...
Article
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Similarly sized skulls of juvenile specimens of the seymouriid and discosauriscid seymouriamorph tetrapods Seymouria and Discosauriscus are compared for the first time. Comparisons are based on a single juvenile skull of Seymouria sanjuanensis from the Lower Permian Bromacker locality, Germany, measuring 56 mm in length and several skulls of Discos...
Article
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Skulls of two specimens of the Lower Permian seymouriamorph tetrapod Seymouria, referred to Seymouria sanjuanensis Vaughn, 1966, with midline skull lengths of about 19.0 and 20.0 mm, respectively, and probably representing an early juvenile ontogenetic stage, are described from the Lower Permian Tambach Formation, lowermost formation of the Upper R...
Article
A new genus and species of varanodontine varanopid, Tambacarnifex unguifalcatus, is described on the basis of the greater portion of the postcranium and a closely associated partial left dentary from the Lower Permian (Wolfcampian) Tambach Formation, the lower-most unit of the Upper Rotliegend, of the Bromacker locality in the midregion of the Thur...
Article
Georgenthalia clavinasica, a new genus and species of amphibamid dissorophoid temnospondyl, is represented by a small, complete, postmetamorphic skull from the Lower Permian Bromacker locality, Germany. It is only the third non-amniote of an assemblage of 12 terrestrial tetrapod taxa known from this locality. It is characterized by a broadly rounde...
Article
As a single stratigraphic source and site of high-fidelity vertebrate trackways and superbly preserved skeletons, the Lower Permian Tambach Formation, lowermost unit of the Upper Rotliegend, of the Bromacker locality in the middle part of the Thuringian Forest near Gotha, central Germany, provides a unique opportunity of matching late Paleozoic tra...
Article
The cranial skeleton of the large captorhinid reptile Labidosaurus hamatus, known only from the Lower Permian of Texas, is described on the basis of new, undescribed specimens. Labidosaurus is distinguished from other captorhinids by the more extreme sloping of the ventral (alveolar) margin of the premaxilla, a low dorsum sellae of the parabasisphe...
Article
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The skeletal anatomy of the Early Permian eureptile Thuringothyris mahlendorffae from the Bromacker Quarry, Germany, is redescribed on the basis of several new specimens. The taxon retains some plesiomorphic characters, such as an ectopterygoid and a tabular, but it also possesses low neural spines and nonswollen neural arches, a combination that i...
Article
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Several cranial structures are described for the first time in the Lower Permian seymouriamorph tetrapod Seymouria sanjuanensis: 1) septomaxilla, 2) suborbital fenestra, 3) small denticles on the palate densely spaced in compact rows radiating from a point near the midwidth of the posterior margin of the palatal ramus of the pterygoid, 4) long cult...
Article
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Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscie...
Article
Full-text available
Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscie...
Article
Full-text available
Additional specimens of the sphenacodontid synapsid Dimetrodon teutonis, including a maxilla, dorsal vertebrae, scapulocoracoids, a humerus, and partial, articulated hindlimbs that consist of the epipodials, tarsi, and incomplete digits, not only expand significantly its known anatomy, but also confirm its recognition as a new species of Dimetrodon...
Article
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The Bromacker locality of the Lower Permian Tambach Formation, lowermost unit of the Upper Rotliegend of central Germany, is unique among localities of comparable age. It preserves an exclusively terrestrial assemblage. Its unique nature allows an assessment of the degree of terrestriality of other Lower Permian assemblages, and the Bromacker assem...
Article
A new species of the dissorophid amphibian Aspidosaurus, A. binasser, is based on a single specimen consisting of the greater part of the skull and short, articulated strings of vertebrae, as well as numerous isolated and fragmentary vertebrae, from the presacral and caudal regions of the column collected from the Lower Permian (Leonardian) Arroyo...
Article
Superbly preserved tarsi of a new, undescribed, primitive member of Diadectidae and of Diadectes, the best known member of the family, are described. The major distinction between them is the retention of sutures in the astragalus of the former which clearly indicate an origin from the fusion of three separate ossifications considered homologues of...
Article
Superbly preserved tarsi of a new, undescribed, primitive member of Diadectidae and of Diadectes , the best known member of the family, are described. The major distinction between them is the retention of sutures in the astragalus of the former which clearly indicate an origin from the fusion of three separate ossifications considered homologues o...
Article
Full-text available
Restudy of Mesenosaurus romeri, based on new and previously described cranial materials from the Upper Permian of the Mezen River basin of northern Russia, confirms its assignment to the synapsid eupelycosaurian family Varanopseidae. Comparisons with other members of the family support a pattern of relationship that recognizes two clades: one is co...
Article
Full-text available
A new species of the sphenacodontid synapsid Dimetrodon, D. teutonis, is described on the basis of a single, adult specimen consisting of a large portion of the presacral vertebral column. The holotype was collected from the Lower Permian Tambach Formation, lowermost formational unit of the Upper Rotliegend, of the Bromacker quarry locality in the...
Article
An articulated partial skeleton, including a nearly complete skull and left forelimb, of a crocodylomorph reptile from the Upper Triassic Chinle Formation of Ghost Ranch, New Mexico, is referable to Hesperosuchus agilis Colbert, 1952. It contributes much new information on the skeletal structure of this previously poorly known taxon. A large, circu...