Species: calathocercos MARYANSKA & OSMOLSKA, 1974
Etymology: Greek, kalathos, "basket," and Greek, kerkos, "tail"; in reverence to the caudal tendons arranged in a kind of a basket.

Holotype: G. I. No. SPS 100/1201 (formerly 100/51)

Locality: Nemegt, Nemegt Basin, Ömnögov (South Gobi), Mongolia.

Horizon: Nemegt Formation.

Biostratigraphy: Tarbosaurus bataar and Saurolophus angustirostris Zone.

Age: Lower Maastrichtian Stage, Uppermost Senonian, Uppermost Gulf Epoch, Late Cretaceous.

Material: Skull without mandibles, lacking nasals, anterior portion of frontals, supraorbitals, prefrontals, right jugo-maxillar arch, left maxillary dentition preserved posteriorly, 2 sternal plates, 10 posterior dorsal vertebrae with ribs attached, 6 sacral vertebrae with nearly complete right side sacral ribs, and fragmentary left side ribs, neural arches of sacrals lacking, 29 postsacral vertebrae with caudal ribs, several incomplete chevrons, right ilium, left ilium in articulation with proximal portion of right ischium, distal parts of prepubes, left femur with damaged distal articular surface lacking greater and lesser trochanters, fragmentary right femur, distal ends of left and right tibia and fibula, left astragalus, left and right distal tarsal III, right metatarsal II, and distal portion of metatarsal III, distal parts of left metatarsals I, II, III, phalanx 1 of digit?IV of left pes, numerous free caudal tendons and a basket work of tendons woven around distal caudals of preserved series.

Referred material:

= cf. Homalocephale clathocercos ZHAO, unpublished, WEISHAMPEL, BARRETT, CORIA, LE LOEUFF, XU, ZHAO, SAHNI, GOMANI & NOTO, 2004

Locality: Xixang Zizhique, China.

Horizon: Margyang Formation.

Biostratigraphy:

Age: Late Cretaceous.

Material:

Number: Not given: