Genus: Alcovasaurus GALTON, & CARPENTER, 2016
Etymology: In reference to Alcova, Natrona County, Wyoming, where the specimen was found, and Greek, sauros, "lizard."
= Natronasaurus ULANSKY, 2014a (nomen nudum)
Etymology: In reference to Natrona County, Wyoming, where it was found and Greek, sauros, "lizard."

Species: longispinus (GILMORE, 1914) GALTON, & CARPENTER, 2016
Etymology: Latin, longus, "long," and Latin, spina, "spine."
= Stegosaurus longispinus GILMORE, 1914
= Natronasaurus longispinus (GILMORE, 1914) ULANSKY, 2014a (nomen nudum)
= Miragaia longispinus (GILMORE, 1914) COSTA & MATEUS, 2019

Holotype: UW 20503 (formerly D54)

Locality: About 1 1/2 miles (-2.4 km) east of Alcova near Alcova Reservoir, Natrona County, Wyoming.

Horizon: Equivalent to the Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone?

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

Material: 42 vertebrae, fragmentary sacrum, 2 ischia, portion of one pubis, right femur, several ribs and 4 dermal tail spines.
Note: Lost?
Note: USNM has casts of the tail spines.

Tail spikes after Gilmore, 1914.

Referred material:

Locality: Griffin Ranch, ner Bone Cabin Quarry, Como Bluff, Albany County, Wyoming.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

Age: Age? Stage? Epoch? Late Jurassic.

Material:

DMNH 33431: Base of a huge spike.