Species: wellesi KERMACK, 1982
Etymology: In honor of Samuel P. Welles.
Holotype: UCMP No. V6897/83671
Locality: San Bernale Locality, Many Farms, Apache County, Arizona.
Horizon: Kayenta Formation.
Biostratigraphy:
Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.
Material: Skull.
Referred material:
UCMP No V6987/83672: Fragmentary palate and badly damaged roots of teeth.
UCMP No. V6987/83672: Fragmentary right lower jaw.
Locality: Coconino County, Graces Mesa, Arizona.Horizon: Kayenta Formation.
Biostratigraphy:
Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.
Material:
UCMP No. 72056/97756: Fragmentary left lower jaw with teeth.
SUES, 1986Locality: Northern Arizona.
Horizon: Kayenta Formation.
Biostratigraphy:
Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.
Material:
MCZ 8812: Skull and dentary and partial skeleton.
MCZ 8811: Fragmentary skull.
USNM 317203: Skull and dentary of a juvenile.
= Nearctylodon broomi LEWIS, 1986
Etymology:Holotype: USNM 317201
Locality: Us Geological Survey Fossil Vertebrate Locality D1 on Comb Ridge, 11.4 km airline, bearing 069" true, Kayenta, Navajo County, Arizona.
Horizon: Kayenta Formation.
Biostratigraphy:
Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.
Material: A nearly complete articulated skeleton with skull and mandible.
Referred material:
USNM 317202, 371207, 317208: Skull and skeleton.
USNM 317209, 317210: Skulls, mandibles and cervical vertebrae.
USNM 317203, 317205, 317206: Skulls and mandibles.
USNM 317204, 317211, 317212, 317213, 317214: Fragmentary skulls and lower jaw fragments.