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RE: What is Liassaurus
"Liassaurus huenei" Welles, Powell and Pickering vide Pickering, 1995
Sinemurian, Early Jurassic
Lower Lias, England
(Warwick Museum coll.) (gracile) (~3.5 m, ~55 g) anterior
dorsal centrum (45 mm), mid dorsal centrum (50 mm), ilial fragment, partial
pubes, incomplete femora (~320 mm), tibiae (one proximal; 297 mm), distal
distal metatarsal II, distal metatarsal III, proximal phalanx III-1, distal
In 1927, Huene was informed of a theropod partial
skeleton in the Warwick Museum which he later described (1932) as a specimen
of Sarcosaurus woodi. A distal pubis referred to the specimen is not
theropod, as the end is extremely flattened anteroposteriorly. It is very
to sauropodomorphs more derived than Saturnalia, but less than Yunnanosaurus,
and is here referred to that clade. Carrano and Sampson (2004) referred to
specimen as cf. Sarcosaurus woodi, seemingly depending on Huene's
While both Huene and Carrano and Sampson noted similarity between the Warwick
specimen and the woodi holotype, neither provided synapomorphies to support
such a referral. Pickering (1995) listed the name Liassaurus huenei in
an unpublished bibliographic work, credited to Welles, Powell and Pickering.
This is a nomen nudum however, as he didn't follow ICZN Article 8.1.3- it
have been produced in an edition containing simultaneously obtainable copies
by a method that assures numerous identical and durable copies. He later
and Pickering, 1999) referred to it as an unnamed Liassic theropod in the
section of an unpublished Megalosaurus redescription. It is presumably
one of the theropods to be redescribed by Welles and Powell in their
study from the 1970's, which Pickering intends to publish as Mutanda
Pickering posted his diagnosis for "Liassaurus" on a private newsgroup
in 2005, of which only the absent trochanteric shelf was different from
Comparing the two is difficult as only an ilial fragment, proximal pubes and
incomplete femur are preserved in both. The ilial fragment is undescribed,
neither the pubis or femur preserve diagnostic characters or combinations of
characters in both since both lack the femoral head, the woodi type lacks
distal condyles and the Warwick specimen lacks the anterior trochanter.
which differ between femora (curvature, fourth trochanter lateromedial
presence of trochanteric shelf) vary within other basal theropod taxa as
The sharp mediodistal flare on the tibia is similar to Elaphrosaurus
and Ceratosaurus, while the distal tibial depth is greater than
ceratosaurs or tetanurines.
References- Huene, 1932. Die fossile Reptil-Ordnung Saurischia, ihre
Entwicklung und Geschichte.
Monographien zur Geologie und Palaeontologie. 4(1), viii + 361 pp.
Pickering, 1995. Jurassic Park: Unauthorized Jewish Fractals in Philopatry.
A Fractal Scaling in Dinosaurology Project, 2nd revised printing. Capitola,
California. 478 pp.
Welles and Pickering, 1999. Megalosaurus bucklandii. Private publication
of Stephen Pickering, An extract from Archosauromorpha: Cladistics &
A Fractal Scaling in Dinosaurology Project. 119 pp.
Carrano and Sampson, 2004. A review of coelophysoids (Dinosauria: Theropoda)
from the Early Jurassic of Europe, with comments on the late history of the
Coelophysoidea. Neues Jahrbuch fur Geologie und Palaontologie Monatshefte.
> Date: Thu, 28 Oct 2010 12:59:47 +0200
> From: Michael.Lange@gmx.ch
> To: VRTPALEO@usc.edu; firstname.lastname@example.org
> Subject: What is Liassaurus
> Dear list,
> I wonder, what is Liassaurus? I'd also be interested to know in which paper
> the taxon was erected.
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