Khaan

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Khaan
Temporal range:
Ma
Holotype IGM 100/1127
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Family: Oviraptoridae
Subfamily:
Heyuanninae
Genus: Khaan
Clark, Norell & Barsbold, 2001
Species:
K. mckennai
Binomial name
Khaan mckennai
Clark, Norell, & Barsbold, 2001

Khaan (

Description

Artist's impression

Khaan did not differ much from other oviraptorids. At first, its remains were assigned to "

metacarpal
, was considered to differ sufficiently from that of "Ingenia" for it to be assigned to its own genus.

The oviraptorid diet is disputed, with plants and molluscs having been suggested. Like other oviraptorids, Khaan was probably at least partially a meat eater, feeding on small vertebrates like mammals, lizards and possibly other small dinosaurs. It was also probably feathered.

Discovery

The

Malcolm Carnegie McKenna
.

The holotype IGM 100/1127, consists of an almost complete skeleton found together with another specimen, IGM 100/1002. Together they were informally referred to as "Romeo and Juliet". These individuals are about four feet long. A third, considerably larger, specimen, IGM 100/973, was referred to the species.

Classification

Size comparison with a human
Skeletal restoration

Khaan was by Clark assigned to the Oviraptoridae. Among oviraptorids, it was probably more closely related to Conchoraptor.

The cladogram below follows an analysis by Fanti et al., 2012.[2]

Oviraptoridae

Oviraptor

unnamed

Rinchenia

Citipati

unnamed

Khaan

unnamed

Conchoraptor

unnamed

Machairasaurus

unnamed

"Ingenia" (=

Ajancingenia
)

unnamed

Paleobiology

Skull of referred specimen IGM 100/973

According to a 2014 study published in

chevrons. Both specimens were of the same size and build, and thus were likely the same age, ruling out ontogeny. In MPC-D 100/1127, the anterior chevrons showed great similarity to those of other theropods, with no great expansion on the distal end. However, in the other individual, the chevrons had a "heel"-like expansion above the distal end, which increased in size along the sequence. The study ruled out a possibly pathologic explanation, finding sexual dimorphism to have more support. It was thought that the reduced spines were a female characteristic, because they would increase space for laying eggs. Also, the larger spines could be for male muscle attachments, which would support a tail fan.[3]

A 2022 study of the bite force of Khaan and comparisons with other oviraptorosaurs such as Incisivosaurus, Citipati, and Conchoraptor suggests that Khaan had a very strong bite force. The moderate jaw gape seen in oviraptorosaurs is indicative of herbivory in the majority of the group, but it is clear they were likely feeding on much tougher or more types of vegetation than other herbivorous theropods in their environment, such as ornithomimosaurs and therizinosaurs were able to. The examinations suggest oviraptorosaurs may have been powerful-biting generalists or specialists that partook of niche partitioning both in body size and cranial function.[4]

See also

References

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