Post by creature386 on Feb 13, 2013 1:05:56 GMT 5
Magnosaurus nethercombensis
Temporal range: Middle Jurassic, early Bajocian
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Theropoda
(unranked): Tetanurae
Superfamily: Megalosauroidea
Family: Megalosauridae
Subfamily: Afrovenatorinae
Genus: Magnosaurus
Species: Magnosaurus nethercombensis
Location: Nethercomb, 1.6 km north of Sherbourne, Dorset, England; middle part of Inferior Oolite[1], [2].
Description: Magnosaurus nethercombensis (large lizard from Nethercomb) was a small Megalosaur[3], described in 1923 by Friedrich von Huene[1], [2], The Holotype (OUMNH J.12143), (maybe a juvenile[3].) is known from postcranial fragments, like a pubis rodlike in the anterior portion [1], vertebrae, femora, a fragmentary illium and slender tibiae:
Regarding cranial elements, we have a pair of small and slender dentaries:
The dentary of this dinosaur is straight and not as curved as for example in Allosaurus, also the Symphysial facet is absent[3]. It has thicker teeth than Megalosaurus, tough they're quite similar[1]. It has 12-13 at both sides serrated teeth in it's dentary. Some were well preserved, others as broken stumps[3]. A detailed description has been shown by Benson (2010)[4].
Classification:
Magnosaurus nethercombensis was originally described as Megalosaurus nethercombensis[1], later Waldman (1974) supportws its assignment to Megalosaurus and made comparisions with other theropods, like in dentary shape, tooth serrations, ect.[3]. However, von Huene later gave it it's own Genus[2]. Holtz (2004) later explained why it was probably different from Megalosaurus, for example their tibia shapes do not match[5]. Rauhut claimed it to be a synonom of Eustreptospondylus, due to the dentary similarities, they share a similarly expanded front tip of the dentary and enlarged third dentary tooth, so he called it M. oxoniensis[6]. Benson described a reduced ischial peduncle of the ilium and the presence of a marked femoral extensor groove as typical tetanauran features. He also claimed it to be one of the oldest tetanurae, which can be for sure assigned to this clade[4].
Footnotes:
[1] Friedrich von Huene 1923: Carnivorous Saurischia in Europe since the Triassic. Bulletin of the Geological Society of America, 34, 449–458. pdf
[2] M. T. Carrano, R. B. J. Benson, S. D. Sampson (2012): The phylogeny of Tetanurae (Dinosauria: Theropoda). In: Journal of Systematic Palaeontology. 10, Nr. 2, 2012, S. 233 pdf
[3] Waldman, M. 1974. Megalosaurids from the Bajocian (Middle Jurassic) of Dorset. Palaeontology, 17, 325–339. pdf
[4] Benson, R. B. J. 2010. The osteology of Magnosaurus nethercombensis (Dinosauria, Theropoda) from the Bajocian (Middle Jurassic) of the United Kingdom and a reexamination of the oldest records of tetanurans. Journal of Systematic Palaeontology, 8, 131–146. pdf
[5] Holtz Jr., T.R., Molnar, R.E., and Currie, P.J. (2004). Basal Tetanurae.you can find it here a the pages 71-110. (Keep in mind that a lot isn't shown)
[6] Rauhut, O. W. M. 2003. The interrelationships and evolution of basal theropod dinosaurs. Special Papers in Palaeontology, 69, 1–213.
Temporal range: Middle Jurassic, early Bajocian
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Theropoda
(unranked): Tetanurae
Superfamily: Megalosauroidea
Family: Megalosauridae
Subfamily: Afrovenatorinae
Genus: Magnosaurus
Species: Magnosaurus nethercombensis
Location: Nethercomb, 1.6 km north of Sherbourne, Dorset, England; middle part of Inferior Oolite[1], [2].
Description: Magnosaurus nethercombensis (large lizard from Nethercomb) was a small Megalosaur[3], described in 1923 by Friedrich von Huene[1], [2], The Holotype (OUMNH J.12143), (maybe a juvenile[3].) is known from postcranial fragments, like a pubis rodlike in the anterior portion [1], vertebrae, femora, a fragmentary illium and slender tibiae:
Regarding cranial elements, we have a pair of small and slender dentaries:
The dentary of this dinosaur is straight and not as curved as for example in Allosaurus, also the Symphysial facet is absent[3]. It has thicker teeth than Megalosaurus, tough they're quite similar[1]. It has 12-13 at both sides serrated teeth in it's dentary. Some were well preserved, others as broken stumps[3]. A detailed description has been shown by Benson (2010)[4].
Classification:
Magnosaurus nethercombensis was originally described as Megalosaurus nethercombensis[1], later Waldman (1974) supportws its assignment to Megalosaurus and made comparisions with other theropods, like in dentary shape, tooth serrations, ect.[3]. However, von Huene later gave it it's own Genus[2]. Holtz (2004) later explained why it was probably different from Megalosaurus, for example their tibia shapes do not match[5]. Rauhut claimed it to be a synonom of Eustreptospondylus, due to the dentary similarities, they share a similarly expanded front tip of the dentary and enlarged third dentary tooth, so he called it M. oxoniensis[6]. Benson described a reduced ischial peduncle of the ilium and the presence of a marked femoral extensor groove as typical tetanauran features. He also claimed it to be one of the oldest tetanurae, which can be for sure assigned to this clade[4].
Footnotes:
[1] Friedrich von Huene 1923: Carnivorous Saurischia in Europe since the Triassic. Bulletin of the Geological Society of America, 34, 449–458. pdf
[2] M. T. Carrano, R. B. J. Benson, S. D. Sampson (2012): The phylogeny of Tetanurae (Dinosauria: Theropoda). In: Journal of Systematic Palaeontology. 10, Nr. 2, 2012, S. 233 pdf
[3] Waldman, M. 1974. Megalosaurids from the Bajocian (Middle Jurassic) of Dorset. Palaeontology, 17, 325–339. pdf
[4] Benson, R. B. J. 2010. The osteology of Magnosaurus nethercombensis (Dinosauria, Theropoda) from the Bajocian (Middle Jurassic) of the United Kingdom and a reexamination of the oldest records of tetanurans. Journal of Systematic Palaeontology, 8, 131–146. pdf
[5] Holtz Jr., T.R., Molnar, R.E., and Currie, P.J. (2004). Basal Tetanurae.you can find it here a the pages 71-110. (Keep in mind that a lot isn't shown)
[6] Rauhut, O. W. M. 2003. The interrelationships and evolution of basal theropod dinosaurs. Special Papers in Palaeontology, 69, 1–213.