Species: wetherilli (WELLES, 1954) WELLES, 1970
Etymology: In honor of the late John Withal of Kayenta, Arizona, explorer, friend of scientist and trusted trader and counselor to the Navaho whose nephew, Milton, first told Samuel Welles and others of the specimen.
= Megalosaurus wetherilli WELLES, 1954

Holotype: UCMP 37302

Locality: UCMP V-4214 center of flat valley of purplish blocky shale about 200 yards northeast of road fence at dinosaur track locality which is on the road to Moenave 0.15 miles north of the highway (Navajo 1) to Tuba City, Moa Ave 1, Lat. 36°8'43"N, Long. 111°19'12"W, Coconino County, Arizona.

Horizon: Kayenta Formation.

Biostratigraphy:

Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material: A juvenile represented by a nearly complete skeleton.

Note: Paleopathology, A horizontal sulcus just below the prezygapophyseal facets on the anterior face of the neural arch of cervical 5, also 2 pits were found on the entotubrosity of the right humerus. As per SENTER, & JUENGST, 2016, Right radius and ulna with three bony tumors, humerii with broken and healed, left scapula wiht fracture, left and right manual phalanx III-1 broken, distal ends of left and right metacarpal III broken, left manual phalanx I-1 broken and healed fibriscesses, left ulna broken with healed fibriscess and abnormal bony growth, left radius and ulna with healed fratures.

Paratype:

UCMP 37303: Similar sized juvenile represented by; both premaxillae, maxillae, and lower jaws, several vertebrae and other parts of the skeleton.

MOLNAR, 1991

2 unregistered specimens.

 

= cf. Dilophosaurus wetherilli (as per MARSH & ROWE, 2020) GAY, 2002

Locality: MNA 219-0, Rock Head, Rock Head Quadrangle, Arizona.

Horizon: Kayenta Formation.

Biostratigraphy:

Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material:

MNA P1.111: Fragments of a dentary.

MNA P1.116: Left manus, digit 3, phalanx 1.

MNA P1.141: Rignt manus, digit 3, phalanx 2.

MNA P1.318: Distal humerus, a partial fibula and tooth fragment of a juvenile.

MNA P1.135: Dorsal centrum.

MNA P1.176 : Centrum.

MNA P1.177 : Laarge cenrum and partial spine.

MNA P1.138: Vertebral centrum.

MNA P1.247: Partial rib head.

MNA P1.109: Femur of a juvenile.

MNA P1.102: Distal left fibula of a juvenile.

MNA P1.160: Proximal end of a right femur.

MNA P1.154: Proximal end of a right pubis.

MNA P1.248: Complete left pubis.

MNA P1.539: Distal right fibula.

MNA P1.101: Partial proximal left pubis.

MNA P1.122: Ischium fragment.

MNA P1.131: Pedal digit 3 and phalanx 1.

 

MARSH & ROWE, 2020

Locality: Locality TMM 43646, Dilophosaurus Quarry, near the base of Rock Head (Rock Head Quadrangle, U.S.G.S. 7/5’series), is located at latitude 35°41'22"N, longitude 111°17'22”W, on land of the Navajo Nation, northern edge of Gold Spring Wash drainage basin, Coconino County, northeastern Arizona.

Horizon: 'middle third' of the Silty Faces, Kayenta Formation.

Biostratigraphy:

Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material:

TMM 43646-1: Fragmentary skull and fragmentary skeleton.

 

Locality: Locality TMM 47006, Jon's Theropod, Navajo Nation, Coconino County, northeastern Arizona.

Horizon: 'middle third' of the Silty Faces, Kayenta Formation.

Biostratigraphy:

Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material:

TMM 47006-1: Complete braincase, including the parabasisphenoid, basioccipital, prootics, otooccipicatals, supraoccipital, and latrosphenoids, the left parietal, the entire presacral vertebral colum (excetp atlas), some of which are in articulation.

 

= cf. Dilophosaurus weatherilli

Locality: TMM 43691, Paiute North 1, Navajo Nation, northern edge of Gold Spring Wash drainage basin, Coconino County, northeastern Arizona.

Horizon: 'middle third' of the Silty Faces, Kayenta Formation.

Biostratigraphy:

Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material:

TMM 43691-1: Complete right ilium.

 

Locality: Locality MNA 356-0, Gold Spring E (formerly Blue Valley), Navajo Nation, northern edge of Gold Spring Wash drainage basin, Coconino County, northeastern Arizona.

Horizon: Silty Faces, Kayenta Formation.

Biostratigraphy:

Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material:

NMA V3145: Distal end of right femur.

 

Loclity: Locality ARCH 71v, ear the Garden of Eden, Arches National Park, Utah.

Horizon: Sandy typical Faces, Kayenta Formation.

Biostratigraphy:

Age: ?Sinemurian-Pliesbachian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material:

ARCH 4102: Fragments of vertebrae, limbs, and medapodials.

= Dilophosaurus breedorum WELLES & PICKERING, 1995
Etymology: In honor of the Breed family, especially William J. Breed, the curator fo Geology at the Museum of Northern Arizona, who in 1964 assised Sam Wells in collecting UCMP 77270.

Holotype: UCMP 77270

Locality: UCMP locality V6468, 1/4 miles south from the type of Dilophosaurus, near Tuba City, Coconino County, Arizona.

Horizon: Kayenta Formation, Glen Canyon Group.

Biostratigraphy:

Age: Hettangian Stage, Lower Lias Epoch, Early Jurassic.

Material: Skull, ie, premaxillae, right nasal, prefrontals, frontals, parietals, right maxilla, lachrymal, postfrontal, partial right postorbital, proximal right squamosal, rostral right jugal, right quadrate, quadratojugal, laterosphenoids, left and partial right opisthotics, partial basisphenoids, exoccipitals, right mandible, rostral left dentary, atlas-axis, cervicals 3-9, pectorals 1, 3, 4, dorsals, 1-8, 10, partial sacrum 1-3, disarticulated caudals, ribs, gastralia fragments, left glenoid and coracoid, right radius and ulna, partial left ilium, right ischium head, fused distal ends, left pubis head, distal right pubis, right femur, tibia, right metatarsals I-III and V, 2 right pedal unguals.
Note: May be sexual dimorphism.

New reconstruction of skull.