J. Head

Publications63
h-index26
Citations2,344
Highly Influential Citations160
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Best Practices for Justifying Fossil Calibrations
TLDR
A specimen-based protocol for selecting and documenting relevant fossils is presented and future directions for evaluating and utilizing phylogenetic and temporal data from the fossil record are discussed, to establish the best practices for justifying fossils used for the temporal calibration of molecular phylogenies.
A new species of basal hadrosaurid (Dinosauria, Ornithischia) from the Cenomanian of Texas
TLDR
The taxon is unique among hadrosaurids in possessing a ventrally deflected muzzle, including a deep, rostrally massive mandible, that is interpreted to represent an exclusively low-browsing pattern of food acquisition in a deltai...
Homeotic effects, somitogenesis and the evolution of vertebral numbers in recent and fossil amniotes
TLDR
It is shown that the mammalian (synapsid) and reptilian lineages show early in their evolutionary histories clear divergences in axial developmental plasticity, in terms of both regionalization and meristic change, with basal synapsids sharing the conserved axial configuration of crown mammals, and basal reptiles demonstrating the plasticity of extant taxa.
Giant boid snake from the Palaeocene neotropics reveals hotter past equatorial temperatures
TLDR
Depositional environments and faunal composition of the Cerrejón Formation indicate an anaconda-like ecology for the giant snake, and an earliest Cenozoic origin of neotropical vertebrate faunas.
Predation upon Hatchling Dinosaurs by a New Snake from the Late Cretaceous of India
A new snake from Upper Cretaceous rocks in India is found with hatchling sauropod dinosaurs, demonstrating that large, gape-limited snakes were probably capable of taking in moderate-sized vertebrate…
FIRST REPORT OF SNAKES (SERPENTES) FROM THE LATE MIDDLE EOCENE PONDAUNG FORMATION, MYANMAR
Department of Anthropology, University of Iowa, Iowa City, IA 52242, USAThe reptile fauna of the Eocene Pondaung Formation of central My-anmar (Fig. 1) has received little attention compared to its…
A New Species of the Snake Madtsoia from the Upper Cretaceous of India and Its Paleobiogeographic Implications
ABSTRACT We report the discovery of a new species of the snake Madtsoia from1 infratrappean horizons of Late Cretaceous age in Pisdura, central India. Recovered vertebrae are large (1.83 cm long;…
Evolution of the snake body form reveals homoplasy in amniote Hox gene function
TLDR
It is demonstrated that morphometric regional boundaries correspond to mapped gene expression domains in snakes, suggesting that their primaxial domain is patterned by a normally functional Hox code.
Fossil calibration dates for molecular phylogenetic analysis of snakes 2: Caenophidia, Colubroidea, Elapoidea, Colubridae
TLDR
The spatial and temporal distribution of reliable first occurrence of colubroid taxa suggests late Paleogene intercontinental dispersals between Asia, North America, and Africa, followed by rapid diversification and subsequent dispersals into all non-Polar continents by the early Neogene.
Eocene lizard from Germany reveals amphisbaenian origins
TLDR
Morphometric analysis of body shape and ecology in squamates indicates that the postcranial anatomy of the new taxon is most consistent with opportunistically burrowing habits, which in combination with cranial reinforcement indicates that head-first burrowing evolved before body elongation and may have been a crucial first step in the evolution of amphisbaenian fossoriality.
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