Corumictis

Corumictis is an extinct genus of mustelid from the Early Oligocene (Arikareean) of North America, specifically Oregon.[2] It contains a single species Corumictis wolsani, which is notable for being the oldest currently known mustelid.

Corumictis
Temporal range: Early - Late Oligocene
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Mustelidae
Genus: †Corumictis
Paterson et al., 2020[1]
Species:
†C. wolsani
Binomial name
†Corumictis wolsani
Paterson et al., 2020

Name

The generic name is derived from the Latin words Corum (northwest) and ictis (weasel). The specific name honors paleontologist Mieczysław Wolsan, who extensively studied the evolutionary history of fossil musteloids.

Discovery

The skull of Corumictis was discovered around 2005 at the John Day Formation in northern Oregon, which dates to between 28.8 million and 25.9 million years ago.[3] The skull was originally believed to have belonged to an ancient feline, but was re-examined by palaeontologist Ryan Paterson of Carlton University in Canada, who concluded that it was a mustelid instead.[4]

Description

Corumictis was very small, about the size of the living least weasel; its skull measured just 4 cm (1.6 in) long.[4] It is considered closely allied with Plesictis and certain Oligobunine mustelids.[2] Corumictis has very sharp teeth, and compared to modern mustelids it lacks an alisphenoid canal and a postprotocrista on its first molars. It retains a dorsally deep suprameatal fossa, a feature occasionally considered unique to procyonids.[2]

References
  1. "Corumictis". Fossilworks.
  2. Paterson, R. (2020). "The earliest mustelid in North America". Zoological Journal of the Linnean Society. 188 (4): 1318–1339. doi:10.1093/zoolinnean/zlz091.
  3. Chung, Emily. "Fossil identified as 'great-grandfather' of wolverines". CBC News. Retrieved March 3, 2020.
  4. Dvorsky, George. "Prehistoric 'Cat' Skull Actually Belonged to an Ancestor of Modern Wolverines". Gizmodo.
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