Anatomy and relationships of Haptodus garnettensis , a Pennsylvanian synapsid from Kansas

1993/06/08 by Michel Laurin · 5 citations
Earth and Planetary Sciences · Environmental Science · #Paleontology and Evolutionary Biology #Evolution and Paleontology Studies #Amphibian and Reptile Biology #Pennsylvanian #Autapomorphy #Anatomy #Premaxilla #Paleontology #Geology #Biology #Phylogenetic tree #Maxilla

paper · doi:10.1080/02724634.1993.10011501

openalex publication_date 1993/06/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29

Abstract

New, well-preserved specimens of the Upper Pennsylvanian synapsid Haptodus garnettensis from Garnett, Kansas, represent more mature individuals than those available previously and indicate that H. garnettensis is diagnosed by several autapomorphies: septomaxilla with small facial exposure; prefrontal pocket shallow; pineal ridge present; supratemporal notched; anterior end of angular overlapped dorsally and ventrally by splenial; robust, chisel-shaped teeth; teeth present on palatal ramus of premaxilla. A phylogenetic analysis of early synapsids indicates that H. garnettensis is not a sphenacodontid.

Citations

• AMNIOTE PHYLOGENY AND THE IMPORTANCE OF FOSSILS
• Scoliomus puercensis Williston and Case, 1913, identified as a junior synonym of Sphenacodon ferox Marsh (Reptilia, Pelycosauria)
• Definition, diagnosis, and origin of Mammalia
• A review of fighting adaptations in dinocephalians (Reptilia, Therapsida)

Cited by

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• The splendid isolation of biological nomenclature
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• Jean Albert Gaudry [wikipedia]