Bactrosaurus ‭(‬club lizard‭)

Short Info

Bactrosaurus ‭(‬club lizard‭)

Phonetic : Bak-tro-sore-us.

Named By : Charles W.‭ ‬Gilmore‭ ‬-‭ ‬1933

Diet : Herbivore

Size : Estimated 6 meters long

Type of Dinosaur : Euornithopod

Type Species : B.‭ ‬johnsoni‭ (‬type‭)‬,‭ ‬B.‭ ‬kysylumensis‭?

Found in : China‭ ‬-‭ ‬Iren Dabasu Formation,‭ ‬Zouyun Formation.‭ ‬Kazakhstan‭ ‬-‭ ‬Dabrazhin Formation.‭ ‬Mongolia‭ ‬-‭ ‬Baynshire Formation

When it Lived : Late Cretaceous, 84-71 million years ago

Bactrosaurus (/,baektr@’so:r@sBactrosaurus (/,baektr@’so “Club lizard,” “baktron” = club sauros, which is lizard) is a genus belonging to the herbivorous dinosaurs that was found in Asia in the Late Cretaceous, about 96-85 million years in the past. The location Bactrosaurus is in during the Cretaceous is one of the first known hadrosauroids. Even though it’s not a part of the full skull, Bactrosaurus can be considered to be one of the most well-known of these early hadrosauroids, which makes the discovery of Bactrosaurus a major one.

Smuggled Bactrosaurus skeleton
Gary Todd, CC0, via Wikimedia Commons

The very first Bactrosaurus remains found in the Iren Dabasu Formation in the Gobi Desert of China consisted of partial skeletons from six individuals of B. Johnsoni. The remains found originate from various different age groups, from those who could be young ones to adults of full size. The fossils were first described as early as 1933, by Charles W. Gilmore, who named the animal Bactrosaurus which translates to “club lizard”, in reference to the huge club-shaped neural spines that protrude from the vertebrae. It is believed that the Iren Dabasu Formation has been dating back prior to Cenomanian stage, which was around 95.8 + 6.2 million years ago.

I, Laikayiu, CC BY-SA 3.0, via Wikimedia Commons

The remains of Bactrosaurus are not yet complete been found, but Bactrosaurus is more well-known than many of the earlier hadrosaurs. The most well-known parts of the anatomy that belong to Bactrosaurus include the pelvis, limbs and the majority parts of the skull (although the crest is noticeably absent).

“Bakesaurus” is an informal name that is derived from an extinct maxilla of the Majiacun Formation of China assigned to Bactrosaurus in 2001. The name was created and depicted in a book written in Chinese in 2005 by Zhou (2005) as well as then appeared on the Internet in February of 2006, when it was featured as a member of the Dinosaur Mailing List by Jerry D. Harris.

Bactrosaurus Museum of Ancient Life
Etemenanki3, CC BY-SA 4.0, via Wikimedia Commons

A typical Bactrosaurus could have been 6.2 meters (20 feet) in length and was weighing 1.2 to 3.6 tonnes (1,200 to 3,600 kilograms). It was a close relative of Lambeosaurus and has a range of iguanodont features, including three teeth that were stacked on top of each tooth visible, tiny maxillary teeth, as well as an extraordinaryly powerful body for the hadrosaur. It displays features that are intermediate between the two major hadrosaurid groups. The femur was measured at 80 centimetres (2.6 feet) long.

Bactrosaurus was initially believed as being a lambeosaurine which was believed to be the oldest and the most primitive known, and its lack of crest head was thought to be an anomaly. A popular 1990 book said that it was an unrestored crest however, recent research suggests Bactrosaurus as a basal hadrosauromorph. Basal members don’t have hollow crests. Therefore, Bactrosaurus could be without crests.

Source: Wikipedia