COLORADO

FREMONT COUNTY

NEAR THE TOWN OF HOWARD

IN THE VALLEY OF ARKANSAS RIVER

SANGRE DE CRISTO FORMATION

PROBABLY MISSOURIAN

LOWER STEPHANIAN

UPPER SILESIAN STAGE

KASIMOVIAN EPOCH?

LATE PENNSYLVANIAN

(LATE CARBONIFEROUS)

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: AMPHIBIA LINNAEUS, 1758

SUBCLASS: LABYRINTHODONTIA OWEN, 1860

Incertae sedis

Gen. sp indet.

SUPERORDER: TEMNOSPONDYLIA ZITTEL, 1887

MICROORDER: EUSKELIA YATES & WARREN, 2000

ORDER: EYROPODIA

Superfamily: DISSOROPHOIDEA Boulenger, 1902 (sensu Bolt, 1969)

Family: AMPHIBAMIDAE Moodie, 1910

Amphibamus sp

MICROORDER: LIMNARCHIA YATES & WARREN, 2000

ORDER: DVINOSAURIA YATES & WARREN, 2000

INFRAORDER: TRIMERORHACHOIDA ROMER, 1947

Superfamily: TRIMERORHACHOIDEA Cope, 1882 (sensu Romer, 1947)

Family: TRIMERORHACHIDAE Cope, 1882

Trimerorhachis sp

NEOTETRAPODA

SUBCLASS: REPTILIOMORPHA SAVE-SODERBERGH, 1934

ORDER: ANTHRACOSAURIA WATSON, 1917

Incertae sedis

Gen. sp indet.

SUBCLASS: LEPOSPONDYLI ZITTEL, 1888

ORDER: AISTOPODA MIALL, 1875

Family: OESTOCEPHALIDAE Anderson, 2003

*Coloraderpeton boilli

ORDER: MICROSAURIA DAWSON, 1863

SUBORDER: TUDITANOMORPHA CARROLL & GASKILLL, 1978

Family: TRIHECATONTIDAE Vaughn, 1972

*Trihecaton howardinus

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: PARAREPTILIA OLSON 1947

INFRACLASS: SAUROPSIDA HUXLEY, 1864

ORDER: COTYLOSAURIA COPE, 1880

SUBORDER: DIADECTOMORPHA Watson, 1917

Family: DIADECTIDAE Cope, 1880

*Desmatodon hesperis

Family: LIMNOSCELIDAE Williston, 1911

*Limnoscelis dynatis

SUBCLASS: SYNAPSIDA OSBORN, 1903

ORDER: PELYCOSAURIA COPE, 1878

Incertae sedis

Xyrospondylus ecordi
= Edaphosaurus ecordi

SUBORDER: EUPELYCOSAURIA KEMP, 1982

INFRAORDER: OPHIACHODONTIA NOVA

Family: OPHIACODONTIDAE Nopsca, 1923

Varanosaurus sp

INFRAORDER: EDAPHOSAURA NOVA

Incertae sedis

non Edaphosaurus, E. raymondi
= Naosaurus raymondi
= Ianthasaurus raymondi

INFRAORDER: DIMETRODONTOMORPHA emend NOPCSA, 1925

Family: SPHENACODONTIDAE Marsh, 1878

Subfamily: SPHENACODONTINAE Marsh, 1878 (sensu Nopcsa, 1925)

Gen. sp indet.

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