Re: Ostafrikasaurus crassiserratus, new spinosaur from Tendaguru

[Mickey Mortimer <mickey_mortimer111@msn.com>]

[Yay, the DML accidentally unsubscribed me from sending messages, so my last 
two posts failed.  Since writing this one, Cau has raised the same issue on his 
blog.]

Or it's just positional variation of the ?ceratosaurid "Labrosaurus" stechowi.  
Rauhut (2011) indicated the shape, cross section and serration morphology was 
the same as stechowi, that it lacks spinosaurid-style granulated enamel (contra 
Buffetaut- wonder who's right) and that unlike baryonychines, the distal crown 
is least ridged.  It differs from stechowi only in- having more lingual ridges 
(11 vs. 2-3); lingual ridges well developed apically; labial 
ridges present.  Ironically, Ostafrikasaurus may be a good genus for stechowi 
as well.

Rauhut, 2011. Theropod dinosaurs from the Late Jurassic of Tendaguru 
(Tanzania). Palaeontology. 86, 195-239.

Mickey Mortimer

> ----------------------------------------
> > Date: Wed, 5 Apr 012 1::9::7 +200<
> > From: Michael.Lange@gmx.ch
> > To: VRTPALEO@usc.edu; dinosaur@usc.edu
> > Subject: Ostafrikasaurus crassiserratus, new spinosaur from Tendaguru
> >
> > I don't think this one has been mentioned before:
> >
> > Buffetaut (012)) An early spinosaurid dinosaur from the Late Jurassic of 
> > Tendaguru(Tanzania) and the evolution of the spinosaurid dentition. Oryctos 
> > 0:: --<
> >
> > Abstract - An isolated theropod tooth from the terminal Jurassic of the 
> > Tendaguru (Tanzania), originally referred to Labrosaurus
> > (?) stechowi, is described as the type specimen of a new genus and species 
> > of spinosaurid theropod. It shows an
> > enamel ornamentation reminiscent of Baryonyx and allied forms, but differs 
> > from all other known spinosaurids by the large
> > size of the denticles borne by the carinae. The new taxon is the earliest 
> > currently known spinosaurid. It sheds some light on
> > aspects of dental evolution in spinosaurids, which seems to have been 
> > characterised by reduction of the denticles.
> >
> > Cheers, Michael
> > --
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>