Eoscansor

Eoscansor
Temporal range: Late Carboniferous, 305 Ma
↓
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Family: †Varanopidae
Genus: †Eoscansor
Lucas et al., 2022
Species:
†E. cobrensis
Binomial name
†Eoscansor cobrensis
Lucas et al., 2022

Eoscansor (EE-oh-SKAN-sor; meaning "dawn climber") is a species of small varanopid amniote that lives from the upper Pennsylvanian subperiod in northern New Mexico, United States 305 million years ago. The species Eoscansor cobrensis was 24.5 centimeters (9.6 inches) long and weighed 58.3 grams. The tetrapods teeth indicated that it was insectivorous. The small size and grasping limbs means that was E. cobrensis highly agile and likely arboreal (tree climbing).[1] The name Eoscansor means "dawn climber", derived from Greek with "Eo" meaning dawn and "scansor" meaning climber. E. cobrensis is currently the oldest specialised climbing tetrapod animal pushing back the original record by 15 million years.[2][3] The species was discovered in the El Cobre Canyon Formation in northern New Mexico near the village of Chama in 2005 but was not prepared until 2015. The COVID-19 pandemic in 2020 pushed study back until 2022 where it was described as a new genus and species. Eoscansor fossil holotype (NMMHS P-75122) is part of the New Mexico Museum of Natural History and Science (NMMNHS) collection.[4][5]

The holotype specimen of E. cobrensis is incomplete. Preserved skeletal remains consist of some skull fragments, an incomplete dentary with several teeth, atlas, axis. The fossil includes two anterior vertebrae and at least ten dorsal vertebrae, eight caudal vertebrae, incomplete interclavicle, parts of both clavicles, rib bones and gastralia, humeri, right raidus, ulnae, partial left and right manus and left ilium. The skeleton also includes a ischium, pubis, femora (~22mm), tibiae, fibulae and both left and right incomplete pedes.[3]

References

  1. ^ "305-Million-Year-Old Fossil is Oldest Known Tree-Climbing Reptile | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2022-07-07.
  2. ^ "Oldest species of tree-climbing reptile discovered in New Mexico". Carlsbad Current-Argus. Retrieved 2022-07-07.
  3. ^ a b Lucas, Spencer G.; Rinehart, Larry F.; Celeskey, Matthew D.; Berman, David S.; Henrici, Amy C. (June 2022). "A Scansorial Varanopid Eupelycosaur from the Pennsylvanian of New Mexico" (PDF). Annals of Carnegie Museum. 87 (3): 167–205. doi:10.2992/007.087.0301. ISSN 0097-4463.
  4. ^ "Fossil Of Oldest Known Species Of Tree-Climbing Reptile Discovered Near Chama In Northern New Mexico". ladailypost.com. Retrieved 2022-07-07.
  5. ^ "Rewriting history: Oldest tree-climbing reptile on record discovered in NM". sports.yahoo.com. Retrieved 2022-07-07.

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