Andrew Heckert

Appalachian State University, Geology, Faculty Member

North Carolina State Museum of Natural Sciences, Paleontology, Department Member

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PhD University of New Mexico 2001
MS University of New Mexico 1997
BS Denison University 1993 Summa cum laude

Vertebrate paleontologist principally interested in Triassic microvertebrates, Late Triassic ecosystems, archosaur teeth and dentitions, and a range of other Mesozoic topics.
Address: Dept. Geology ASU Box 32067
572 Rivers St
Appalachian State University
Boone, NC 28608-2067

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C. Michael Hall

University of Canterbury/Te Whare Wānanga o Waitaha

Kristen J Gremillion

Ohio State University

Eric H Christiansen

Brigham Young University

David Seamon

Kansas State University

Jose Ruben Guzman-Gutierrez

Universidad Humanista de las Americas

Armando Marques-Guedes

UNL - New University of Lisbon

James Kirkland

Utah Geological Survey

Thomas Holtz

University of Maryland

Carlo Romano

University of Zurich, Switzerland

Gabriel Gutierrez-Alonso

University of Salamanca

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Ontogenetic heterodonty in<i>Reticulodus synergus</i>(Chondrichthyes, Hybodontiformes) from the Upper Triassic of the southwestern U.S.A., with a redescription of the genus

Journal of Vertebrate Paleontology, Jul 4, 2017

ABSTRACT Isolated teeth from the extinct hybodontoid Reticulodus synergus Murry and Kirby are kno... more ABSTRACT Isolated teeth from the extinct hybodontoid Reticulodus synergus Murry and Kirby are known from Upper Triassic strata of Revueltian age in Arizona, Utah, and New Mexico, U.S.A. Here, we provide evidence for ontogenetic heterodonty in Reticulodus based on a reappraisal of the type and newly discovered material from the Upper Triassic Bull Canyon Formation in east-central New Mexico. We reexamined the ∼4000 specimens of the type series and measured representative teeth (n = 88) for mesiodistal length, crown width, and crown height. Reticulodus exhibits moderate monognathic heterodonty. We then assigned almost all teeth to one of three morphotypes (I–III) defined by ratios of crown width to mesiodistal length, with morphotype I being the most equilateral and morphotype III the most elongate. A fourth morphotype (IV) possesses very low crown width to mesiodistal length ratios and is tentatively considered as posterolateral in position. Adult teeth measure 1–10 mm long, with apical surfaces ornamented with numerous reticulations, crenulations, and pits, and appear subrounded, rectangular, or hexagonal in apical view—these teeth probably enabled a durophagous diet. Juvenile teeth measure approximately 0.7–2 mm in length, exhibit greater variation in crown shape than do adult teeth, and possess a clutching-type dentition that would facilitate the capture and consumption of softer-bodied organisms. The dentition thus transitioned from a clutching-type in juveniles to a grinding-type in adults, which would have allowed both adults and juveniles to occupy the same habitat and suppressed intraspecific competition between the two age groups.

Second-day road log, from Gallup to Fort Wingate, Sixmile Canyon, Ciniza, Red Rock Park, Church Rock, White Mesa, Thoreau and Grants

A hypothesis: autonomic rhythms are reflected in growth lines of teeth in humans and extinct archosaurs

Autonomic Neuroscience: Basic and Clinical, Feb 1, 2005

Andrew Heckert

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