Microzemiotes

Microzemiotes; Temporal range: Norian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Diapsida
Genus:	Microzemiotes ; Burch et. al., 2024
Species:	M. sonselaensis
Binomial name
	Microzemiotes sonselaensis; Burch et. al., 2024

Last updated September 04, 2025

Microzemiotes is an extinct genus of diapsid reptile that inhabited Arizona during the middle Norian stage of the Triassic period. It contains a single species, Microzemiotes sonselaensis. The genus is known from a single partial left dentary (lower jaw bone) bearing three teeth, discovered in the Sonsela Member of the Chinle Formation. Along with Uatchitodon , known only from isolated teeth, it is one of the oldest known reptiles with evidence of a venom delivery system.^[1]

References

↑ Burch, Helen E.; Eddins, Hannah-Marie S.; Stocker, Michelle R.; Kligman, Ben T.; Marsh, Adam D.; Parker, William G.; Nesbitt, Sterling J. (14 October 2024). "A small venomous reptile from the Late Triassic (Norian) of the southwestern United States". PeerJ . 12: e18279. doi: 10.7717/peerj.18279 . ISSN 2167-8359. PMC 11485104 . PMID 39421413.{{cite journal}}: CS1 maint: article number as page number (link)

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[1] Burch, Helen E.; Eddins, Hannah-Marie S.; Stocker, Michelle R.; Kligman, Ben T.; Marsh, Adam D.; Parker, William G.; Nesbitt, Sterling J. (14 October 2024). "A small venomous reptile from the Late Triassic (Norian) of the southwestern United States". PeerJ . 12: e18279. doi: 10.7717/peerj.18279 . ISSN 2167-8359. PMC 11485104 . PMID 39421413.{{cite journal}}: CS1 maint: article number as page number (link)

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