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yoult β Fukuivenator paradoxus
Published: 2016-02-23 21:52:24 +0000 UTC; Views: 2327; Favourites: 96; Downloads: 0
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Comments: 24
Looks really great. You've made it look like something basal indeed by not giving it a tail fan
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Beautiful!
I've got two qestions, though:
1. Why not rectrices on the tail?
2. Why the primaries are shorter than the secondaries on the wing?
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Thank you.
1. The absence of rectrices is based on its basal placement outside of Pennaraptora , which is the only group known to have them.
2. The length discrepancy between primaries and secondaries follows the hypothesis of the initial usage as brooding helper. Some argue that non-maniraptoran maniraptoriforms lacked primaries at all (ornithomimosaurs), which I don't quite follow.
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"The absence of rectrices is based on its basal placement outside of Pennaraptora , which is the only group known to have them"
Doesn't Deinocheirus extend the pygostyle/tail fan bracket to maniraptoriformes?
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Not in a peer-reviewed analysis iirc. Deinocheirus "pygostyle" might be convergence if it can be considered as a pygostyle at all.
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Not necessarily, as the presence of fused distal tail vertebrae aren't conclusive indicators of a fan of retrices. Beipiaosaurus for example has the last five caudals fused together into a pygostyle-like structure, however the well-preserved halo of feathers surrounding the tail shows no sign of any retrices at all.Β
I've heard suggestions relatively recently to start using the term "caudostyle" for this sort of structure, and restrict "pygostyle" to either the true pygostyle in birds or to a structure specifically for anchoring a fan of retrices, I'm not entirely sure which, but I think you get the idea.
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The question is if this simple pygostyle can really be attributed to the presence of rectrices. And if it's true the question remains if this structure appeared independently or has the same phylogenetic origin.Β
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The brooding hypothesis suggests a strong flexibility of the wrist favors longer primaries. How far could non-maniraptoran maniraptoriforms fold their hands?
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Shouldn't be that great, as it is very limited in most maniraptorans with the exception of oviraptorosaurs and avialaens.
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Would you find it wrong (or less parsimonious) then to restore it the other way round, with the primaries longer than the secondaries?
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I'll repeat what I said on FB but this very nice ! 
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Nyees Adrian 
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Fukuivenator Is Real Sexy Theropod.
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Awesome! Β Chalk another find up for 2016! Β
So what do we have here? Β Dromaeosaurid? Β Troodontid? Β
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A basal maniraptoran apparently.
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