Haptodus garnettensis

"Haptodus" garnettensis is an extinct genus of basal sphenacodont from the Late Carboniferous (Pennsylvanian) of Kansas, USA.

"Haptodus" garnettensis
Temporal range: Early Permian,
~304 Ma
↓
Restoration of H. garnettensis
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Sphenacodontia
Genus: †"Haptodus"
Species:
†"H." garnettensis
Binomial name
†"Haptodus" garnettensis
Currie, 1977

Taxonomy

The holotype of "Haptodus" garnettensis is RM 14156, a partially articulated skeleton (cranial and postcranial) of immature individual. More than 16 well-preserved specimen of various ontological states were referred to this species. All specimens came from the Garnett Quarry, located in the Anderson County of Kansas. They were collected from the Rock Lake Member of the Stanton Formation (Lansing Group), dating to the late Kasimovian stage of the late Pennsylvanian series, about 304 million years old.[1]

Laurin (1993, 1994) suggested that Haptodus garnettensis would have to be renamed because he saw Haptodus baylei as a possible nomen dubium.[2] In his dissertation revising taxa assigned to Haptodus, Spindler (2015) proposed that "Haptodus" garnettensis is not congeneric with the Haptodus type species, giving it the nomen ex dissertationae Eohaptodus. He also concluded that two specimens referred to garnettensis, ROM 43608 and ROM 43601, represent new genera and species, the former specimen being named Kenomagnathus by Spindler (2020) and latter specimen being given the nomen ex dissertationae Tenuacaptor reiszi.[3][4]

References
  1. Michel Laurin (1993). "Anatomy and relationships of Haptodus garnettensis, a Pennsylvanian synapsid from Kansas". Journal of Vertebrate Paleontology. 13 (2): 200–229. doi:10.1080/02724634.1993.10011501.CS1 maint: uses authors parameter (link)
  2. Michel Laurin (1994). "Re-evaluation of Cutleria wilmarthi, an Early Permian synapsid from Colorado". Journal of Vertebrate Paleontology. 14 (1): 134–138. doi:10.1080/02724634.1994.10011544.CS1 maint: uses authors parameter (link)
  3. Spindler, F. 2015. The basal Sphenacodontia - systematic revision and evolutionary implications. Ph.D. thesis, Technische Universität Bergakademie Freiberg, Germany. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-171748
  4. Spindler, Frederik. 2020. A faunivorous early sphenacodontian synapsid with a diastema. Palaeontologia Electronica, 23(1):a01. https://doi.org/10.26879/1023 palaeo-electronica.org/content/2020/2905-early-sphenacodontian-diastema
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