Troodont Tooth from India
Suffice to say, this is quite surprising, considering that, unlike other deinonychosaurs, troodontids were otherwise virtually absent from Gondwanna.
This offers two possibilites:
– There was a lineage of troodontids living in the southern continents and they simply weren’t preserved, which is quite possible, as the Late Cretaceous fossil reccord from the southern continents is notoriously poor anyways.
– They were unique indian endemics, presumably having arrived to it from Africa – which did had a closer connection to Laurasia, as faunal interchanges were Europe did occur.
It’s also highly likely that it was simply some sort of dinosaur or crocodillian – or even a ledpidosaur – that convergently developed troodont-like teeth, though I suppose such a close resemblance would be that much of a coincidence.
Another deinonychosaur, the flying Rahonavis, coexisted with this troodontid, and I am even tempted to suggest that both animals are in truth closely related: either Rahonavis is actually a volant troodontid (which frankly is the least I expect, given it’s recent examination outside of Unenlagiinae; it would also explain this isolated case of gondwannan troodontids, as they probably flew their way into India-Madagascar), or that the toorontid teeth actually belongs to a rahonavid converging on troodonts. Considering my previous speculations turned true…
At any rate, India-Madagascar definitely was an interesting region during the Late Cretaceous. Among other things, we have the ungulate-like mammal Kharmerungulatum, a possible late living stegosaur (Dravidosaurus is actually a chimaera) and at least three distinct lineages of palaeognaths. If modern Madagascar is the bearer of the Cenozoic’s weirdest fauna, then it’s Mesozoic predecessor was just as alien a place, one of the best examples of the bizarre nature of island fauna.