"In 2006, the remains of two gigantic plesiosaurs were found in a dark grey shale facies of
the Upper Jurassic Slottsmøya Member of the Agardhfjellet Formation on the Norwegian
archipelago of Svalbard. The Slottsmøya Member was deposited in shallow marine settings
at high paleolatitudes, and biostratigraphic analyses of macro- and microfossils indicate
a (middle?) Tithonian age for the fossiliferous portion of the unit. Excavation of the first
specimen in 2007 revealed a partial, semi-articulated skeleton including the anterior toothbearing
elements of the rostrum, two cervical and numerous dorsal vertebrae, a nearly
complete coracoid and right forelimb, and several dorsal ribs and gastralia. Excavation of
the second, conspecific individual in 2008, revealed new portions of the posterior skull
region and anterior cervical vertebrae. Based on the presence of massive teeth (? 60 mm
crown diameter), cervical vertebral proportions, and coracoid and propodial morphology, the
specimens are referred to the Pliosauridae. Tooth crown cross-sectional shape is trihedral,
suggesting affinities with Pliosaurus. Epipodial morphology of the Svalbard taxon, being
very much wider than long, most closely resembles that of Pliosaurus brachydeirus and
P. brachyspondylus, but differs from those of Callovian taxa such as Liopleurodon ferox
and Simolestes vorax. Cervical centrum morphology is most similar to that of Pliosaurus
rossicus. However, the coracoid differs in overall shape from that of both P. brachydeirus and
Pliosaurus rossicus. Comparative measurements of the vertebrae, limbs, and pectoral girdle
with individuals of other large pliosaurid taxa (Liopleurodon, Pliosaurus, and Kronosaurus)
suggest an estimated body length of 13-15 meters for the Svalbard specimens. The Svalbard
material not only sheds new light on the morphology of large Late Jurassic pliosaurids, but
it also helps to fill a temporal gap between the older, better known Callovian/Kimmeridgian
taxa and those of the Early Cretaceous, such as Kronosaurus."

Following things are interesting:
Predator x is very similar to the genus piosaurus, quite possibly a pliosaurus species. I would be interested to see how closely it was related to pliosaurus macromerus.
From the given dimensions the two svalbard specimen seem to be somewhat smaller than the monster from Aramberri.

Source:
Knutsen, E., Druckenmiller, P., Hurum, J., Nakrem, H. (2009). "Preliminary account of new Late Jurassic pliosaurid material from Svalbard, Norway." Journal of Vertebrate Paleontology, 128A.

Хе-хе, перепутал темки. Плиозавров рыл, на левиафана случайно наткнулся.

Pliosaurs predated in a different way from sharks. In large sharks,
the jaws are relatively weak and they rely on cutting teeth to take
chunks of meat out of their prey. Pliosaurs had what was probable the
most powerful bite of any animal that ever lived. The temporal
fenestrae - the holes in the skull through which the jaw muscles pass
- in the Weymouth Bay pliosaur are big enough for me to stand in. The
power delivered by these enormous muscles must have been extremely
high, as is shown by the great depth of the lower jaw. I think that
large pliosaurs relied on this hugely powerful bite to dismember their
prey.

from Richard Forrest

Алекс, эта реконструкция правильная?

Если нет, то есть ли у тебя правильная?
Самый крупный череп - 2 метра?

Почему ты так уверен? Найдена челюсть 3метровой длины. Если судить по пропорциям кронозавра то длина того плиозавра была 12 метров. Но пропорции могли быть и другие.

Там непонятно. Его непонятно к какому роду относят, то к лиоплевродону, то к плиозавру.

Кот :

Если плиозавр с трехметровой челюстью относился к роду леоплевродон, то его длина была чуть больше 10,5 метров. А вот если к роду Pliosaurus - я не знаю. Скелета не нашел.

У КОГО ЕСТЬ РЕКОНСТРУКЦИИ СКЕЛЕТА СОБСТВЕННО ПЛИОЗАВРА?

В этой статье указаны пропорции леплевродона 1 к 5.19 !   http://eprints.gla.ac.uk/55067/1/55067.pdf  5.b. The size of the animal
The size of the cranium from which CAMSM J.27424
was derived can be estimated by comparison with
NHM R2680. The isolated cranium of NHM R2680
has a snout to occipital condyle length of 1120 mm
(Andrews, 1913, p. 21) and a paroccipital length of
150 mm (Andrews, 1897, p. 178). CAMSM J.27424
has a paroccipital process length of 165 mm. Assuming
a 1:1 growth ratio between the cranium and paroccipital
process beyond the 1.12 m cranial length of NHM
R2680, the length of skull from which CAMSM
J.27424 came can be estimated at approximately
1.23 m. This length estimate is slightly shorter than an
‘old adult’ (sensu Brown, 1981) individual of Liopleurodon
ferox (NHM R3536), estimated at 1265 mm from
snout tip to occipital condyle (Andrews, 1913, p. 22).
The overall length of the animal from which
CAMSM J.27424 came can be estimated by comparison
to a skeleton of Liopleurodon ferox (GPIT 1754/2).
GPIT 1754/2 has a skull:total body length ratio of
approximately 1:5.19 (skull length 0.94 m, overall body
length including skull 4.88 m). This would indicate a
calculated overall body length for theCAMSMJ.27424
animal of approximately 6.39 metres CAMSM J.27424 is
interpreted as having come from an ‘adult’ individual
(sensu Brown, 1981) of Liopleurodon with a cranial
length of approximately 1.23 metres and an estimated
overall body length of approximately 6.39 metres.

http://onlinelibrary.wiley.com/doi/10.1 … x/abstract
Свежая статья, пятнадцать минут назад пришла по RSS

Отредактировано Левша (16 May 2012 21:47:50)

Simolestes keileni sp. nov„ un Pliosaure  (Plesiosauria, Reptilia) du Baiocien supérieur  de Lorraine (France)  par P. GODEFROIT

Rediscovery of Wibur Knight's Megalneusaurus rex Site. New Material From an Old Pit (Wahl, Ross, Massare, 2007)

The Largest Pliosaurid from North America by Dean R. Lomax

Шонизавр как бы на заднем плане. И потом, как выяснилось, тот который достигал 20 или 21 метра в длину принадлежит не к шонизавру а к шастазавру.

Альбертозавр :

Лиоплевродон - 25 метров

Приведите хоть один источник ("кроме прогулок").