Holotype: YPM 11820

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Lower jaw.

Neotype: YPM 10646: Lower jaw.

Referred material:

MARSH, 1880

Number: Not given: Lower jaw with teeth.

 

DAVIS, CIFELLI & ROUGIER, 2018

Locality: Cisco Mammal Quarry (OMNH locality V1278), Grand County, Utah.

Horizon: Morrison Formation.

Biostratigraphy:

Age: Comobluffian age, Kimmeridgian-Tithonian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

OMNH 78594: An isolated LM4.

 

ENGELMANN & CALLISON, 1998

Locality: Quarry face as exposed inside the Dinosaur National Monument Visitor Center, Carnegie Quarry, Vernal, Uintah County, Utah.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

DINO 13578: Left lower molar.

 

FOSTER & MARTIN, 1995

Locality: V9138, Little Houstin Quarry, Crook County, Wyoming.

Horizon: Member? Morrison Formation, lower portion of the upper third.

Biostratigraphy: Zone?

Age: Age?, Stage?, Malm Epoch, Late Jurassic.

Material:

Number: Not given: Partial jaw.

 

MAGALLANES, BERD, MARTIN & LUO, 2023 (published 2024)

Locality: KU-WY-121, from privae land belonging to M.Y. 140 Ranch LLC (owners John P. Babiarz and Deb L. Hodson), south of Sundance, Weston County, Wyoming.

Horizon: Morrison Formation.

Biostratigraphy:

Age: Oxfordian-Kimmeridgian Stage, Dogger Epoch, Late Jurassic.

Material:

KUVP 134101: A partial left dentray with crowns of p3-p4 and m1-m6 preserved plus alveoli for the m7 and m8 loci, and an incomplete alveolus for p2 locus.

PROTHERO, 1981

Locality:

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

Age: Age?, Stage?, Malm Epoch, Late Jurassic.

Material:

AMNH 1011450: Right jaw fragment with LM4-6 and alveoli for LM7-8.

AMNH 101139: A right mandible fragment with 5 molars, possibly LM3-7.

AMNH 101137: Left mandible fragment with LP4-LM3.

AMNH 101136: Right ramal fragment with 3 molars of uncertain designation.

AMNH 101141: Right ramal fragment with LM7-8.

YPM 11884:

YPM 10646:

USNM 2722:

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Species: arcuatus MARSH, 1879
Etymology:
= Herpetairus arcuatus (MARSH, 1879) SIMPSON, 1927

Holotype: YPM 11822

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Right maxilla with M2-7, much worn.

Neotype: YPM 13740: Left maxilla with M1-4, almost unworn.

Referred material:

YPM 13739: Maxilla with P4 and M1-3.

YPM 13741:

YPM 13742: Fragment of maxilla with 2 molars, provisionally referred.

YPM 13743:

YPM 13744:

YPM 13746:

YPM 13747:

USNM 2724:

USNM 2762:

USNM 2800:

USNM 2818:

USNM 2845:

Numbers: Not given: 2 upper jaws and 2 lower jaws.

 

ENGELMANN & CALLISON, 1998

Locality: Quarry face as exposed inside the Dinosaur National Monument Visitor Center, Carnegie Quarry, Vernal, Uintah County, Utah.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:

DINO 12794: Upper molar.

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Species: gracilis MARSH, 1881
Etymology:

Holotype:

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Lower jaw with teeth.

Referred material:

Numbers: Not given: Several lower jaws with teeth.

_____________________________________________________________________________________

Species: tenax MARSH, 1889
Etymology:

Holotype: YPM 10698

Locality: Niobrara County, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Fragmentary jaw with teeth.
_____________________________________________________________________________________
Species:? humilis (SIMPSON, 1929)
Etymology:
= Herpetairus humilis SIMPSON, 1929

Holotype: YPM 13745

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Left maxilla with UM3-6.

Referred material:

AMNH 101128: Right maxillary fragment with one molar (?UM4).

AMNH 101129: Right maxillary fragment with (?) UM4-5.

AMNH 101130: Left maxillary fragment bearing UM3-5 and alveoli for UM2 and UM6.

_____________________________________________________________________________________

Species: obtusus
Etymology:
= Herpetairus obtusus

Holotype: YPM 11819A

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material:
_____________________________________________________________________________________

Species: leiriensis MARTIN, 1999
Etymology:

Holotype: Gui Mam 130/74

Locality: Guimarota lignite mine (Mina de Lignito Guimarota), 1.5 km SSE of Leiria, Leiria District, Portugal.

Horizon:

Biostratigraphy:

Age: Lustianien, Kimmeridgian Stage, Middle Malm Epoch, Late Jurassic.

Material: Left dentary with teeth.

Referred material:

MARTIN, 2000

Gui Mam 41/79: Left dentary with teeth.

Gui Mam 49/79: Left dentary with teeth.

Gui Mam 142/75: Fragmentary anterior skull.

Gui Mam 162/75: Dentary with teeth.

Gui Mam 200: Humerus.

Gui Mam 112/76: Right lower jaw of a juvenile with teeth.

MARTIN, 2013

Gui Mam 54/80: Left humerus.

Gui Mam 2003 (8.1.1980): Right ilium.