RE: When carnivores kill other carnivores...

[Michael Mortimer <mickey_mortimer111@msn.com>]

Guy Leahy wrote-

> Off the top of my head, I can't think of too many
> dinosaur faunas which include two big theropods of
> approximately equal size (Albertosaurus/Daspletosaurus
> does come to mind.)  Are there any other examples?

Inferior Oolite-
Magnosaurus
"Walkersaurus"

Stonesfield Slate-
Megalosaurus
unnamed (?)abelisaur

Calcaire de Caen-
Poekilopleuron
Dubreillosaurus

Lower Shaximiao-
"Szechuanoraptor"
Xuanhanosaurus
Kaijiangosaurus
Gasosaurus

Morrison-
Ceratosaurus
Torvosaurus
Allosaurus
Saurophaganax
Marshosaurus
Tanycolagreus

Upper Shaximiao-
Sinraptor
Yangchuanosaurus

Tendaguru-
"Allosaurus" tengagurensis
Ceratosaurus

Wessex-
Neovenator
Baryonyx

Sau Khua-
Siamosaurus
Siamotyrannus

Lameta-
Coeluroides/Jubbulpuria
Indosuchus/Indosaurus
Rajasaurus

Candelaros-
Ekrixinatosaurus
Giganotosaurus

Huincul-
Ilokelesia
undescribed carcharodontosaurid

Anacleto-
Abelisaurus
Aucasaurus
undescribed carcharodontosaurid

Kem-Kem-
Deltadromeus
Carcharodontosaurus
Spinosaurus

Baharija-
Bahariasaurus
Carcharodontosaurus
Spinosaurus

I think it was probably the norm to have multiple large theropod species in 
the kinds of environments which preserve fossils.  The exception being 
Maastrichtian Western North America and Campanian-Maastrichtian Asia, which 
seem to only have single species of tyrannosaurine (unless you include 
omnivorous/herbivorous taxa).

Mickey Mortimer