Genus: Lophionotus GIBSON, 2013
Etymology: Greek, lophio, "ridge" and Greek, notus, "back."

Species:   sanjuanensis GIBSON, 2013
Etymology: In reference to San Juan County, Utah, where the new species was recovered.
= Semionotus sp SCHAEFFER, 1967
= Semionotus n. sp. MILNER et al., 2006

Holotype: AMNH 5680

Locality: Big Indian Wash (west of big Indiana Road), and near Big Indian Rock (east of Big Indian Road), Lisbon Valley, San Juan County, Utah.

Horion: Church Rock Member, Chinle Formation.

Biostratigraphy:

Age: Norian Stage, Late Triassic Epoch, Late Triassic.

Material: Nearly complete specimen.

Paratype:

AMNH 5679: Skull and anterior part of body.

AMNH 5690: Specimen with incomplete skull lacking caudal fin.

Locality: Locality B, near Bedrock, Dolores River Canyon, Montrose County, Colorado.

Horizon: Upper part of the Chinle Formation.

Biostratigraphy:

Age: Late Triassic.

Material:

AMNH 5684: Complete specimen.

Referred material :

UMNH VP 19419A, UMNH VP 19420A, B,. UMNH VP 19421: Nearly complete specimens.

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Species:  chinleana (SCHAEFFER, 1967)
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Species:  kanabensis (SCHAEFFER & DUNKLE, 1950)
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Species:  parnaibensis GALLO, de PAIVA, PETRA & BRITO, 2022
Etymology: In referece to the Parnaiba Basin, where the type specime was collected.

Holotype: Pz. UERJ 511

Locality: Fazenda Muzinho Shale, 16 km northest of Floriano city, Floriano-Amarante Road, Paranaiba Basin, Piaui State, Brazil.

Horizon: Pastos Bons Formation.

Biostratigraphy:

Age: Callovian Stage, Late Dogger Epoch, Late Middle Jurassic-Oxforidan Stage, Early Malm Epoch, Early Late Jurassic.

Material: An articualted but incomplete preserved specimen.

Paratypes:
DGM-900-B, Pz UERJ 512: Articulated, but incompletely preserved specimens.