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A Lot of Different Lizards Mk.II

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Description

The most common theropod of the Morrison, and probably the most famous Jurassic carnivore, Allosaurus comes in a wide range of sizes; represented here are just a fraction of the total amount of referred specimens. The rightmost one is a juvenile for which not much of a description is available.

Color key:
Red - specimens similar to OMNH 1123 (''Saurophaganax maximus'') 
Blue - specimens similar to DINO 2560 (Allosaurus ''atrox'') and USNM 4734 (Allosaurus fragilis neotype)
Grey - specimens similar to DINO 11541 (Allosaurus ''jimmadseni''
Green - specimen ML 415 = (Allosaurus ''europaeus'')

Masses based on GDI of DINO 2560 and Bates et al. (2012) -7.5% model of MOR 693.

References:
-
Osborn, Henry Fairfield; Mook, Charles C. (1921). "CamarasaurusAmphicoelias, and other sauropods of Cope". Memoirs of the American Museum of Natural History, New Series3 (3): 247–387.
-Madsen, James H., Jr. (1993) [1976]. Allosaurus fragilis: A Revised Osteology. Utah Geological Survey Bulletin 109 (2nd ed.). Salt Lake City: Utah Geological Survey.
-Pérez-Moreno, B.P.; Chure, D. J.; Pires, C.; Marques Da Silva, C.; Dos Santos, V.; Dantas, P.; Povoas, L.; Cachao, M.; Sanz, J. L. (1999). "On the presence of Allosaurus fragilis (Theropoda: Carnosauria) in the Upper Jurassic of Portugal: First evidence of an intercontinental dinosaur species" (PDF)Journal of the Geological Society156 (3): 449–452. doi:10.1144/gsjgs.156.3.0449.
-Bates, K.T.; Manning, P.L.; Hodgetts, D.; Sellers, W.I. (2009). Beckett, Ronald, ed. "Estimating Mass Properties of Dinosaurs Using Laser Imaging and 3D Computer Modelling"PLoS ONE4 (2): e4532. Bibcode:2009PLoSO...4.4532Bdoi:10.1371/journal.pone.0004532.
-theropoddatabase.com/Carnosaur…
-:iconscotthartman:'s DINO 2560 and MOR 693 skeletals
-:iconfranoys: for a helluva lot of scaling

Human silhouette from www.onlygfx.com/20-woman-silho…

UPDATE 02/20/18: Well, that's more like it.
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TyrannosaurusPrime's avatar

Just found out about this, but while browsing the 2019 SVP abstracts, I found this:


"CHARACTERIZING THE ONTOGENETIC STAGE OF A VERY

LARGE SPECIMEN OF ALLOSAURUS FROM THE JURASSIC OF

WYOMING WITH SUBADULT CHARACTERISTICS


VOEGELE, Kristyn K., Rowan University, Glassboro, NJ, United States of

America; ULLMANN, Paul V., Rowan University, Glassboro, NJ, United

States of America; GROVE, Joseph, Concordia College, Moorhead, MN,

United States of America; NELLERMOE, Ron, Concordia College,

Moorhead, MN, United States of America


A previously undescribed, isolated specimen of Allosaurus was discovered

associated in 2004 in north-central Wyoming in the Jurassic Morrison

Formation. Comprised of 65 cranial and postcranial elements, this specimen

exhibits a unique combination of large body size with subadult characteristics.

The majority of the dorsal vertebrae remain unfused, the pubes remain

unfused, the coracoid is not fused to the scapula, and the majority of the

cranial elements remain unfused. Additionally, the number of alveoli in the

dentaries (19 and 21 alveoli) and complete right maxilla (19 alveoli) of this

specimen are significantly higher than that commonly reported for Allosaurus

(14-17 alveoli in the dentary, 15-16 maxillary alveoli). Despite these subadult

characteristics, this specimen is large for an Allosaurus individual, with a

femoral midshaft circumference of 28 cm. To reconcile the discrepancy

between its size and features commonly associated with subadult individuals,

we have completed a histological analysis of the only limb bone preserved, a

partial right femur. As only the distal half of this bone was preserved, we made

a histologic section near the broken end of the bone, approximately at

midshaft. Our histologic analysis revealed expansive laminar fibrolamellar

bone forming the primary cortex with minimal secondary remodeling

restricted to the internal cortex. Numerous micro-fractures present throughout

the cortex make the identification and tracking of the few lines of arrested

growth difficult. Although closely spaced lines of arrested growth are present

near the cortical edge, primary osteons remain abundant in the external most

cortical rim, suggesting that an external fundamental system is not present.

Therefore, we conclude this large individual was still growing but its growth

had slowed down; however, it was not yet an “old” individual."


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