Project 512: A. K. Huttenlocker, C. A. Sidor, R. M. H. Smith. 2011. A New Specimen of Promoschorhynchus (Therapsida: Therocephalia: Akidnognathidae) from the Lower Triassic of South Africa and its Implications for Theriodont Survivorship Across the Permo-Triassic Boundary. Journal of Vertebrate Paleontology. 31 (2):405-421.
Specimen: † Therocephalia akidnognathidae (SAM/PK:K10014)


The anatomy of a new subadult specimen of eutherocephalian therapsid, attributed to Promoschorhynchus cf. P. platyrhinus, is described from lowermost Triassic Lystrosaurus Assemblage Zone strata in the main Karoo Basin of South Africa. The specimen preserves information previously unknown in the genus, including details of the posterior region of the skull and intertemporal region, and a partial (though disarticulated) postcranial skeleton. A cladistic analysis of 32 therapsid taxa, including 24 Permo-Triassic therocephalian genera, and 121 craniodental and postcranial characters supports the specimen's placement within the Permian akidnognathid genus Promoschorhynchus (making it the youngest documented occurrence of this taxon) within a monophyletic Therocephalia. Inclusion of new postcranial characters strengthens support of the therocephalian clade. The new record of Promoschorhynchus offers insights into the diversity of eutheriodonts across the Permo-Triassic boundary (PTB) in the Karoo Basin. In contrast to cynodonts, therocephalians exhibited decreased rates of cladogenesis across the PTB, with several Triassic lineages having roots in the Late Permian rather than representing earliest Triassic radiations.

Read the article »

Project DOI: 10.7934/P512,
This project contains
  • 1 Media
  • 3 Documents
  • 1 Taxon
  • 1 Specimen

Download Project SDD File
Currently Viewing:
MorphoBank Project 512

    This research
    supported by

    Authors' Institutions

    • Iziko South African Museum, Cape Town

    • Burke Museum of Natural History and Culture, Seattle

    • University of Washington


    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Last logged in 08/06/14
    Maureen Admin
    Full membership
    Last logged in 05/23/11
    Adam Huttenlocker
    Full membership
    Last logged in Never
    Seth Kaufman
    Full membership
    Last logged in 12/22/11

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views12229
    Project overview2928
    Media views3875Media search (3263 views); M93045 (612 views);
    Documents list1238
    Specimen list1970
    Taxon list1524

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project191
    Document downloads15Matrix (7 downloads); Character list (6 downloads); Copyright information for exemplar media (2 downloads);
    Media downloads1M93045 (1 download);
    Project downloads175