Genus: Harenaichthys KIM, LEE, PARK, LEE, WINKLER, JACOBS & BARSBOLD, 2022
Etymology: Latin, harena, "sand" and Greek, ichthys, "fish": Sand fish.

Species: lui KIM, LEE, PARK, LEE, WINKLER, JACOBS & BARSBOLD, 2022
Etymology: In honor of Prof. Junchang Lü for contributing to the Korea-Mongolia International dinosaur Expedition.

Holotype: MPC-KID 2006.002-06

Locality: Altan Uul I, II, IV, Bugiin Tsav, Hermiin Tsav 1 and Ulaan Khushu, Ömnögov (South Gobi), Mongolia.

Horizon: Nemegt Formation.

Biostratigraphy:

Age: Early Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: A right denary, partially articualted centra and nearly complete caudal skeleton.

Referred material:

MPC-KID 2006.002-01, MPC-f20/120, 20/128: Atlas centra.

MPC-KID 2006.002-02-04, MPC-f20/123-127, 20/128, 20/132, 20/137-138, 120/140-141, 20/144: Anterior abdominal centra.

MPC-KID 2006.002-05, MPC-f20/129, 20/133-136, 20/139, 20/142-143, 120/145, 20/149-153, 20/159-165: _osterior abdominal centra.

MPC-f20/122, 20/130-131, 20/146, 20/154-156: Caudal centra.

MPC-KID 2006.002-06: Right premaxilla.

MPC-f20/117: Articualted abdomina centra with disarticualted ribs and epineurals.

MPC-f20/119: left quadrate, an articualted abdominal centra with loosely articualted ribs.

MPC-f20/121, 20/157-158: Ural centa.

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