Genus: Toretocnemus MERRIAM, 1902
Etymology: Greek, toretos, “perforated” (past-participle of toreo, “pierce, perforates”), Greek, kneme, “lower leg, shibone” + us: Perforated shin.
= Leptocherius MERRIAM, 1903 non
Etymology: Greek, leptos, “slender”, Greek, kheir, “hand” + us: Slender handed one.
= Merriamia BOULENGER, 1904
Etymology: In honor of John Campbell Merriam (1869-1945), American vertebrate Palaeontologist.

Species: californicus MERRIAM, 1902
Etymology: In reference to California, where the specimen was discovered.

Holotype: UCMP 8100

Locality: A few miles northeast of Winthrop, Bear Cove, Shasta County, California.

Horizon: Hosselkus Formation Formation.

Biostratigraphy: Trachyceras Zone.

Age: Carnian Stage, Lower Late Triassic Epoch, Late Triassic.

Material: Ribs, middle, posterior dorsal and anterior caudal vertebrae, the pelvic arch, both hind limbs and the right anterior limb.

Referred material:

LUCAS & GONZALEZ-LEON, 1995, LUCAS, 2002

Locality: Sierra del Alamo, Northwestern Sonora, Mexico.

Horizon: Antimonio Formation.

Biostratigraphy: Horizons, A, D and E, Dilleri zone.

Age: Upper Carnian Stage, Middle Late Triassic Epoch, Late Triassic.

Material:

ERNO-A1:Dorsal centra.
Note: Unit 3.

ERNO-A3: Dorsal centra.
Note: Unit 27.

ERNO-A4: 2 damaged centra.
Note: Unit 3.

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Species: zitteli (MERRIAM, 1903) MOTANI, 1999
Etymology: In honor of Alfred von Zittel.
= Leptocherius zitteli MERRIAM, 1903
= Merriamia zitteli (MERRIAM, 1903) BOULENGER, 1904

Holotype: UCMP 8099

Locality: From a few miles northeast of Winthrop, Smith’s Cove, Shasta County, California.

Horizon: Hosselkus Formation Formation.

Biostratigraphy: Trachyceras Zone.

Age: Carnian Stage, Lower Late Triassic Epoch, Late Triassic.

Material: Lower half of a skull with a part of dentition, the complete pectoral girdle, both anterior limbs, and numerous fragmentary ribs, vertebrae and abdominal ribs.

Fore and hind fin.