Species: oligos SCHUBUL, MARSH & KLIGMAN, 2025
Etymology: Greek, oligos, "little" in reference to the holotype specimen being very small.

Holotype: PEFO 49132

Locality: PFV 456 (Thunderstorm Ridge), Apache County, Arizona.

Horizon: Blue Mesa Member, Petrified Forest Formation, Chinle Group.

Biostratigraphy:

Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.

Material: A small cervical vertebra.

Paratypes:

PEFO 49131, 55418: 2 trunk vertebrae.

PEFO 48152: Caudal vertebra.

Referred material:

PEFO 43787: Caudal vertebra.

PEFO 43788, 49713: Trunk vertebrae.

PEFO 45854, 48639, 49520, 49863, 49990, 50004, 50233, 50674, 50694, 50703, 50770, 51020, 51025, 51632, 51651, 51702, 52323: Neural archs

PEFO 46506, 48855, 48873, 49485, 49620, 49692, 49796, 50001, 50042, 50064, 50123, 50138, 50189, 50287, 50618, 50632, 50639, 50737, 50824, 51089, 51208, 51676: Neural spikes.

 

Locality: PFV 396 (Coprolite Layer), Apache County, Arizona.

Horizon: Blue Mesa Member, Petrified Forest Formation, Chinle Group.

Biostratigraphy:

Age: Revueltian, Early Norian Substage, Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.

Material:

PEFO 37211: 3 neural spikes.

 

Locality: UCMP loc A269, the Placerias/Downs quarry, in a small valley 6 1/2 miles S 65"W of St. Johns, Apache County, Arizona. Located 0.3 miles northwest of Romero Springs at approximately Long. 109'28'W and lat. 34"27'N on the USGS St. Johns quadrangle of 1921.

Horizon: Bluewater Creek Formation, Lower Chinle Group.

Biostratigraphy:

Age: Adamanian, Latest Carnian Stage, Late Triassic Epoch, Late Triassic.

Material:

MNA V3635: 3 neural arches.

MNA V3671: Trunk vertebra.