[M528] Segnosaurus Therizinosaurid Fossil Dinosaur egg

Description

Fossil dinosaurus egg
Species:
Segnosaurus galbinensis
Locality:
Nanxiong
formation Ganzhou province, China
Age:
Late cretaceous
(100~80 million years ago)
Matrix size:
5.1 x 3,2 inch
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Segnosaurus
is a
genus
of
therizinosaurid
dinosaur
that lived in what is now southeastern Mongolia during the
Late Cretaceous
, about 102–86 million years ago. Multiple incomplete but well-preserved specimens were discovered in the
Gobi Desert
in the 1970s, and in 1979 the genus and species
Segnosaurus galbinensis
were named. The generic name
Segnosaurus
means "slow lizard" and the specific name
galbinensis
refers to the Galbin region. The known material of this dinosaur includes the lower jaw, neck and tail vertebrae, the pelvis, shoulder girdle, and limb bones. Parts of the specimens have gone missing or become damaged since they were collected.
Dinosaur eggs
with embryos of the
Dendroolithidae
type from the
Nanchao Formation
of China were identified as belonging to therizinosaurs and described by Martin Kundrát and colleagues in 2007. The development of the embryos and the fact that no adults were found in association with the nests indicate that therizinosaur hatchlings were
precocial
(capable of locomotion from birth) and able to leave their nests to feed alone, independently of their parents.
[41]
[11]
In a 2013 conference abstract, Yoshitsugu Kobayashi and colleagues reported a nesting ground of theropod dinosaurs from the
Javkhlant Formation
of Mongolia that contained at least 17
egg clutches
within an area 22 by 52 meters (72 ft × 171 ft). Each clutch contained eight spherical eggs with rough surfaces; the eggs were in contact with each other and arranged in a circular structure with no central opening. The researchers identified the eggs as dendroolithid, and therefore therizinosaurian. Though therizinosaurs are not known from the formation, it overlies the Bayan Shireh Formation where
Segnosaurus
,
Erlikosaurus
, and
Enigmosaurus
were found. The multiple clutches indicate some therizinosaurs were colonial nesters like
hadrosaurs
, prosauropods,
titanosaurs
, and birds. The eggs were found in a single
stratigraphic layer
, suggesting the dinosaurs nested at the site on a single occasion and did not exhibit
site fidelity
(always returning to the same site to breed).
[42]
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