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Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)

Identifieur interne : 005375 ( Main/Exploration ); précédent : 005374; suivant : 005376

Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)

Auteurs : David C. Evans [Canada]

Source :

RBID : ISTEX:4DFEA8FE3EF2C46628DDD8302DAAA9C16E6290AF

English descriptors

Abstract

The cranial anatomy of the helmet‐crested lambeosaurine Hypacrosaurus altispinus (Ornithischia: Hadrosauridae) is described, with a focus on ontogenetic and individual variation in phylogenetically significant characters of the cranial crest, braincase, and facial skeleton. Cranial material of H. altispinus represents a relatively complete growth series that includes crestless juveniles of less than half the size of large individuals with fully developed crests. Cranial ontogeny is compared with other lambeosaurines using bivariate morphometrics and through qualitative comparison of a size‐standardized cranial growth series. Bivariate analyses reveal that the relative growth of the skull and cranial crest of H. altispinus and H. stebingeri are similar, and that Hypacrosaurus more closely resembles Corythosaurus than Lambeosaurus. Hypacrosaurus altispinus is systematically revised. The taxon is characterized by five autapomorphies, most of which are concentrated in the skull, as well as an enlarged terminal ischial foot. Maximum parsimony and Bayesian likelihood (Mk+gamma) phylogenetic analyses were conducted to test the monophyly of the genus. Hypacrosaurus monophyly is corroborated in light of new anatomical data. Although H. stebingeri and H. altispinus share few derived characters of the skull, the hypothesis that H. stebingeri is a metaspecies that represents the ancestor of H. altispinus cannot be rejected.

Url:
DOI: 10.1111/j.1096-3642.2009.00611.x


Affiliations:


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Le document en format XML

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<term>Allometry</term>
<term>Altispinus</term>
<term>American museum</term>
<term>Amnh</term>
<term>Anatomical abbreviations</term>
<term>Ange</term>
<term>Auditory</term>
<term>Auditory recess</term>
<term>Autapomorphies</term>
<term>Available material</term>
<term>Basioccipital</term>
<term>Basipterygoid</term>
<term>Basisphenoid</term>
<term>Bayesian</term>
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<term>Bivariate morphometrics</term>
<term>Braincase</term>
<term>Casuarius</term>
<term>Caudal</term>
<term>Caudal half</term>
<term>Caudal margin</term>
<term>Caudally</term>
<term>Caudodorsal</term>
<term>Caudodorsal process</term>
<term>Caudodorsally</term>
<term>Caudolateral</term>
<term>Caudolateral process</term>
<term>Cheneosaurus</term>
<term>Clade</term>
<term>Corythosaurins</term>
<term>Corythosaurus</term>
<term>Corythosaurus casuarius</term>
<term>Cranial</term>
<term>Cranial anatomy</term>
<term>Cranial crest</term>
<term>Cranial growth</term>
<term>Cranial growth series</term>
<term>Cranial material</term>
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<term>Crest apex</term>
<term>Crest area</term>
<term>Crest growth</term>
<term>Cretaceous</term>
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<term>Data matrix</term>
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<term>Dorsal surface</term>
<term>Dorsal view</term>
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<term>Dorsoventrally</term>
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<term>Hypacrosaurus stebingeri</term>
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<term>Lacrimal</term>
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<term>Lambei</term>
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<term>Lateral view</term>
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<term>Laterosphenoid</term>
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<term>Linnean society</term>
<term>Lull wright</term>
<term>Magnicristatus</term>
<term>Margin</term>
<term>Matrix</term>
<term>Maxilla</term>
<term>Maxillary</term>
<term>Maxillary toothrow</term>
<term>Medial</term>
<term>Medial surface</term>
<term>Medicine formation</term>
<term>Metotic</term>
<term>Midline</term>
<term>Morphology</term>
<term>Naris</term>
<term>Nasal</term>
<term>Natural history</term>
<term>Negative allometry</term>
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<term>Ontogenetic series</term>
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<term>Paroccipital</term>
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<term>Parsimony</term>
<term>Phylogenetic</term>
<term>Phylogenetic analyses</term>
<term>Phylogenetic analysis</term>
<term>Phylogeny</term>
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<term>Postorbital process</term>
<term>Prefrontal</term>
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<term>Pterygoid process</term>
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<term>Quadratojugal</term>
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<term>Reisz</term>
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<term>Rostral margin</term>
<term>Rostral process</term>
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<term>Rostrally</term>
<term>Scale bars</term>
<term>Sensu dodson</term>
<term>Skull</term>
<term>Skull growth</term>
<term>Skull length</term>
<term>Skull roof</term>
<term>Smallest specimen</term>
<term>Snout</term>
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<term>Vertebrate paleontology</term>
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<term>Walkeri</term>
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<term>Zoological journal</term>
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<term>Abbreviation</term>
<term>Alberta</term>
<term>Allometric</term>
<term>Allometry</term>
<term>Altispinus</term>
<term>American museum</term>
<term>Amnh</term>
<term>Anatomical abbreviations</term>
<term>Ange</term>
<term>Auditory</term>
<term>Auditory recess</term>
<term>Autapomorphies</term>
<term>Available material</term>
<term>Basioccipital</term>
<term>Basipterygoid</term>
<term>Basisphenoid</term>
<term>Bayesian</term>
<term>Bivariate</term>
<term>Bivariate morphometrics</term>
<term>Braincase</term>
<term>Casuarius</term>
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<term>Caudal half</term>
<term>Caudal margin</term>
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<term>Caudodorsal process</term>
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<term>Corythosaurus casuarius</term>
<term>Cranial</term>
<term>Cranial anatomy</term>
<term>Cranial crest</term>
<term>Cranial growth</term>
<term>Cranial growth series</term>
<term>Cranial material</term>
<term>Crest</term>
<term>Crest apex</term>
<term>Crest area</term>
<term>Crest growth</term>
<term>Cretaceous</term>
<term>Currie</term>
<term>Data matrix</term>
<term>Dentary</term>
<term>Dinosaur</term>
<term>Dinosauria</term>
<term>Dodson</term>
<term>Dorsal</term>
<term>Dorsal margin</term>
<term>Dorsal process</term>
<term>Dorsal surface</term>
<term>Dorsal view</term>
<term>Dorsally</term>
<term>Dorsoventrally</term>
<term>Eberth</term>
<term>Ectopterygoid</term>
<term>Ectopterygoid shelf</term>
<term>Edmonton</term>
<term>Endocranial</term>
<term>Evans</term>
<term>Evans figure</term>
<term>Evans reisz</term>
<term>Exoccipital</term>
<term>Fenestra</term>
<term>Fenestra ovalis</term>
<term>Fontanelle</term>
<term>Foramen</term>
<term>Foramen magnum</term>
<term>Fossa</term>
<term>Generic level</term>
<term>Genus</term>
<term>Gilmore</term>
<term>Godefroit</term>
<term>Hadrosaurian</term>
<term>Hadrosaurian dinosaurs</term>
<term>Hadrosaurid</term>
<term>Hadrosauridae</term>
<term>Hadrosaurids</term>
<term>Hadrosaurines</term>
<term>Heaton</term>
<term>Horner</term>
<term>Horner currie</term>
<term>Horseshoe</term>
<term>Horseshoe canyon formation</term>
<term>Hypacrosaurus</term>
<term>Hypacrosaurus altispinus</term>
<term>Hypacrosaurus stebingeri</term>
<term>Intermedius</term>
<term>Jugal</term>
<term>Lacrimal</term>
<term>Lambe</term>
<term>Lambei</term>
<term>Lambeosaurinae</term>
<term>Lambeosaurine</term>
<term>Lambeosaurine hadrosaurids</term>
<term>Lambeosaurines</term>
<term>Lambeosaurus</term>
<term>Lambeosaurus lambei</term>
<term>Lambeosaurus magnicristatus</term>
<term>Large individuals</term>
<term>Large size</term>
<term>Late cretaceous</term>
<term>Lateral</term>
<term>Lateral braincase wall</term>
<term>Lateral surface</term>
<term>Lateral view</term>
<term>Lateral wall</term>
<term>Laterally</term>
<term>Laterosphenoid</term>
<term>Linnean</term>
<term>Linnean society</term>
<term>Lull wright</term>
<term>Magnicristatus</term>
<term>Margin</term>
<term>Matrix</term>
<term>Maxilla</term>
<term>Maxillary</term>
<term>Maxillary toothrow</term>
<term>Medial</term>
<term>Medial surface</term>
<term>Medicine formation</term>
<term>Metotic</term>
<term>Midline</term>
<term>Morphology</term>
<term>Naris</term>
<term>Nasal</term>
<term>Natural history</term>
<term>Negative allometry</term>
<term>Node</term>
<term>Ontogenetic</term>
<term>Ontogenetic data</term>
<term>Ontogenetic series</term>
<term>Ontogeny</term>
<term>Orbitosphenoid</term>
<term>Ornithischia</term>
<term>Ostrom</term>
<term>Other corythosaurins</term>
<term>Other hadrosaurids</term>
<term>Other lambeosaurines</term>
<term>Other taxa</term>
<term>Palatine</term>
<term>Palatine process</term>
<term>Paleontology</term>
<term>Parasaurolophus</term>
<term>Parasaurolophus walkeri</term>
<term>Parietal</term>
<term>Paroccipital</term>
<term>Paroccipital process</term>
<term>Parsimony</term>
<term>Phylogenetic</term>
<term>Phylogenetic analyses</term>
<term>Phylogenetic analysis</term>
<term>Phylogeny</term>
<term>Positive allometry</term>
<term>Postorbital</term>
<term>Postorbital process</term>
<term>Prefrontal</term>
<term>Premaxilla</term>
<term>Prootic</term>
<term>Pterygoid</term>
<term>Pterygoid process</term>
<term>Quadrate</term>
<term>Quadratojugal</term>
<term>Ramus</term>
<term>Reisz</term>
<term>Relative growth</term>
<term>Robust</term>
<term>Rostral</term>
<term>Rostral margin</term>
<term>Rostral process</term>
<term>Rostral region</term>
<term>Rostrally</term>
<term>Scale bars</term>
<term>Sensu dodson</term>
<term>Skull</term>
<term>Skull growth</term>
<term>Skull length</term>
<term>Skull roof</term>
<term>Smallest specimen</term>
<term>Snout</term>
<term>Southern alberta</term>
<term>Squamosal</term>
<term>Stebingeri</term>
<term>Stratigraphic</term>
<term>Subadult</term>
<term>Supraoccipital</term>
<term>Supratemporal fenestra</term>
<term>Sutural</term>
<term>Systematic biology</term>
<term>Taxon</term>
<term>Tolmanensis</term>
<term>Toothrow</term>
<term>Topology</term>
<term>Total height</term>
<term>Total length</term>
<term>Upper cretaceous</term>
<term>Vagus</term>
<term>Vagus foramen</term>
<term>Var</term>
<term>Ventral</term>
<term>Ventral margin</term>
<term>Ventral view</term>
<term>Ventrally</term>
<term>Vertebrate</term>
<term>Vertebrate paleontology</term>
<term>Vomer</term>
<term>Walkeri</term>
<term>Weishampel</term>
<term>Weishampel horner</term>
<term>Zoological</term>
<term>Zoological journal</term>
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<front>
<div type="abstract">The cranial anatomy of the helmet‐crested lambeosaurine Hypacrosaurus altispinus (Ornithischia: Hadrosauridae) is described, with a focus on ontogenetic and individual variation in phylogenetically significant characters of the cranial crest, braincase, and facial skeleton. Cranial material of H. altispinus represents a relatively complete growth series that includes crestless juveniles of less than half the size of large individuals with fully developed crests. Cranial ontogeny is compared with other lambeosaurines using bivariate morphometrics and through qualitative comparison of a size‐standardized cranial growth series. Bivariate analyses reveal that the relative growth of the skull and cranial crest of H. altispinus and H. stebingeri are similar, and that Hypacrosaurus more closely resembles Corythosaurus than Lambeosaurus. Hypacrosaurus altispinus is systematically revised. The taxon is characterized by five autapomorphies, most of which are concentrated in the skull, as well as an enlarged terminal ischial foot. Maximum parsimony and Bayesian likelihood (Mk+gamma) phylogenetic analyses were conducted to test the monophyly of the genus. Hypacrosaurus monophyly is corroborated in light of new anatomical data. Although H. stebingeri and H. altispinus share few derived characters of the skull, the hypothesis that H. stebingeri is a metaspecies that represents the ancestor of H. altispinus cannot be rejected.</div>
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