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"Haptodus" garnettensis Temporal range: Early Permian, ~304 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Restoration of "H". garnettensis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Sphenacodontia
Genus:	†"Haptodus"
Species:	†"H." garnettensis
Binomial name
†"Haptodus" garnettensis Currie, 1977

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

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.

Laurin (1993, 1994) suggested that Haptodus garnettensis would have to be renamed because he saw Haptodus baylei as a possible nomen dubium. 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.

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.
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.
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

v t e Synapsida
Kingdom: Animalia Phylum: Chordata Superclass: Tetrapoda Clade: Amniota Tetrapodomorpha see Tetrapodomorpha Reptiliomorpha see Reptiliomorpha Synapsida see below↓
Synapsida Synapsida †Diadectomorpha? †Caseasauria? Eothyrididae Asaphestera? Eothyris Oedaleops Vaughnictis Caseidae Alierasaurus Angelosaurus Arisierpeton Callibrachion Casea Caseoides Caseopsis Cotylorhynchus Datheosaurus Ennatosaurus Eocasea Euromycter Lalieudorhynchus Martensius Oromycter Phreatophasma Ruthenosaurus Trichasaurus Eupelycosauria †Varanopidae? Apsisaurus Archaeovenator Ascendonanus Eoscansor Dendromaia Nitosaurus? Pyozia Thrausmosaurus Mesenosaurinae Anningia Cabarzia Elliotsmithia Heleosaurus Mesenosaurus Microvaranops Varanodontinae Aerosaurus Mycterosaurus? Ruthiromia Tambacarnifex Varanops Varanodon Watongia Metopophora see below↓ Incertae sedis †Dimacrodon †Driveria †Gorgodon †Knoxosaurus †Mastersonia †Protoclepsydrops?
Metopophora †Ophiacodontidae Archaeothyris Baldwinonus Clepsydrops Echinerpeton Ophiacodon Stereophallodon Stereorhachis Varanosaurus Haptodontiformes †Ianthodon †Milosaurus †Edaphosauridae Bohemiclavulus Edaphosaurus Glaucosaurus Gordodon Ianthasaurus Lupeosaurus Melanedaphodon Ramodendron Remigiomontanus Xyrospondylus Sphenacodontia †Cutleria †Haptodus †Hypselohaptodus †Kenomagnathus †Tetraceratops †Palaeohatteriidae Palaeohatteria Pantelosaurus Sphenacodontoidea †Shashajaia †Sphenacodontidae Cryptovenator Ctenorhachis Ctenospondylus Cutleria? Dimetrodon Eosyodon Macromerion Neosaurus Secodontosaurus Sphenacodon Steppesaurus? Tappenosaurus? Tetraceratops? Therapsida see below↓
Therapsida Therapsida †Raranimus †Biarmosuchia see Biarmosuchia †Dinocephalia see Dinocephalia †Anomodontia see Anomodontia includes dicynodonts †Gorgonopsia see Gorgonopsia Eutheriodontia †Therocephalia see Therocephalia Cynodontia see Cynodontia includes mammals Incertae sedis †Dinosaurus †Kamagorgon †Niaftasuchus
See also: Pelycosauria Phthinosuchia Theriodontia Category

• Sphenacodonts
• Carboniferous synapsids of North America