Akkedops

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Akkedops
Temporal range: Late Permian
Akkedops bremneri (holotype - lateral and occipital views).png
Holotype skull in lateral (side) (a–b) and occipital (braincase) (c–d) views
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Neodiapsida
Genus: Akkedops
Mooney, Scott & Reisz, 2025
Species:
A. bremneri
Binomial name
Akkedops bremneri
Mooney, Scott & Reisz, 2025

Akkedops is an extinct genus of early neodiapsid reptiles known from the Late Permian of South Africa. The genus contains a single species, A. bremneri, described based on several skulls and skeletons.

Contents

Discovery and naming

Holotype skull in dorsal (top) (a-b) and ventral (bottom) (c-d) views Akkedops bremneri (holotype - dorsal and ventral views).png
Holotype skull in dorsal (top) (a–b) and ventral (bottom) (c–d) views

The Akkedops holotype specimen, SAM-PK-K6205, was discovered by D.T. Bremner in the 1980s in outcrops of the Beaufort Group (Karoo Supergroup) in South Africa. The specimen consists of a single, nearly complete skull with associated postcranial fragments. The specimen is somewhat crushed and distorted. [1]

In 2025, Mooney, Scott & Reisz described Akkedops bremneri as a new genus and species of early reptiles based on these fossil remains. The generic name, Akkedops, combines the Afrikaans word akkedis , meaning "lizard", with the Greek suffix opsis , meaning appearance, in reference to the superficially lizard-like morphology of the preserved material. The specific name, bremneri, honors the discoverer of the holotype specimen. [1]

Mooney, Scott & Reisz also referred two other specimens to Akkedops based on similarities in their anatomy and discovery locality: BP/1/2614, an additional nearly complete but crushed skull, and SAM-PK-K7710, an aggregation of around seven partial individuals originally described as juveniles of the related Youngina . [1] [2]

Classification

To test the relationships of Akkedops, Mooney, Scott & Reisz (2025) scored this taxon in the data matrix of Buffa et al. (2024). [3] This phylogenetic analysis placed Akkedops as the sister taxon to Sauria within the Neodiapsida, diverging after Youngina. These results are displayed in the cladogram below: [1]

Neodiapsida

References

  1. 1 2 3 4 Mooney, Ethan Dean; Scott, Diane; Reisz, Robert Raphael (2025-02-26). "A new stem saurian reptile from the late Permian of South Africa and insights into saurian evolution". Swiss Journal of Palaeontology . 144 (1). doi: 10.1186/s13358-025-00351-y . ISSN   1664-2376. PMC   11865139 .
  2. Smith, Roger M. H.; Evans, Susan E. (1996). "New material of Youngina: evidence of juvenile aggregation in Permian diapsid reptiles". Palaeontology. 39: 289–303.
  3. Buffa, Valentin; Frey, Eberhard; Steyer, J-Sébastien; Laurin, Michel (2024-05-11). "'Birds' of two feathers: Avicranium renestoi and the paraphyly of bird-headed reptiles (Diapsida: 'Avicephala')". Zoological Journal of the Linnean Society . 202 (4): zlae050. doi:10.1093/zoolinnean/zlae050. ISSN   0024-4082.