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Inosaurus, Indosaurus, & Indosuchus
Topic Started: Sep 9 2015, 03:16 PM (788 Views)
Abelisaurid
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Unicellular Organism
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I've come across these names in lists of abelisauridae but the more specific info I've found has been inconsistent and sometimes contradictory.

whether they are nomen dubium or whether there is enough fossils to make partial reconstructions

http://dinosaurpictures.org/Inosaurus-pictures
http://dinopedia.wikia.com/wiki/Indosaurus

Indosaurus was estimated at 11m but only 700kg?

http://www.paleofile.com/Dinosaurs/Theropods/Indosaurus.asp
http://blog.press.princeton.edu/2010/09/19/pgs-daily-dinosaur-indosuchus-raptorius/

I noticed there is a profile on this forum for Indosuchus but not the other 2

can anyone shed more light on the current info for these guys

thanks
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Spinodontosaurus
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Indosaurus is known only from a braincase, frontals and parietals (all skull bones), while Indosuchus is known from frontals and parietals too, but also from a skull roof and partial lacriminal. Source:
http://theropoddatabase.com/Ceratosauria.htm#Indosaurusmatleyi

They may or may not be the same animal.

There is a bunch of unnamed abelisaurian material (scroll down slightly to the 'unnamed Abelisauria') from the Lameta Formation, some of which may be Indosaurus/Indosuchus, but may also be Rajasaurus or another as of yet undiscovered species. Some of that material in the list just above has actually been referred to Indosuchus by Chatterjee, and even more than that appears to be included in Gregory S. Paul's skeletal of it, but as since the material cannot actually be compared to known Indosuchus material this referral cannot be confirmed yet.

To answer your question about size, well we don't know, because it's so fragmentary. Of the material that Greg Paul seems to have incorporated into his skeletal, there is a 60 cm long femur, comparable to the likes of Utahraptor and Dilophosaurus. A weight estimate in the region of 500 - 700 kg seems fairly reasonable based on that. Scaling Greg Paul's skeletal based on this femur yields a tip-to-tip length of 5.1 meters and a hip height of 1.5 meters.

We could also use this skull reconstruction on paleofile.com:
http://www.paleofile.com/Dinosaurs/Theropods/Indosaurus.asp
This seems to be somewhat larger, although the second skull clearly incorporates some of the material referred by Chatterjee. Based on the scale bar, the skull is ~75 cm long, comparable to Ekrixinatosaurus (who's skull has been reconstructed at 71 - 72 cm long by Carnivora user Blaze), but shorter than Abelisaurus itself.

If we scale Greg Paul's skeletal again (based on the size of the premaxilla and maxilla, not the skull itself, as Greg Paul has restored the missing parts differently) we get a tip-to-tip length of 6 meters and a hip height of 1.8 meters, roughly 17% larger than the femur-based estimate and therefore ~60% heavier; 800 - 1,100 kg based on my guestimate above which puts it within the weight range of Ceratosaurus (which I have estimated at ~1,000 kg based on a GDI of Scott Hartman and Greg Paul's skeletals).

But, again, this material may not actually be Indosuchus.

As for Inosaurus, it's just a bunch of vertebrae, some of which probably aren't even from the same species, we don't know what it was exactly although Mortimer recovers it outside of ceratosauria altogether.

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Abelisaurid
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very informative sir, thank you
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