[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
The less important diagnostic characters (those that are *not* avian
apomorphies) would be the ones to examine, and those possibilities are
numerous. Maybe a mixture of Velociraptorine and Archie features? Maybe
a mix of troodontid and Archie features?
Depending on whether you are a ground-up believer or a tree-down
believer, the creature would have been either a good runner
(cursorial-style legs) or a good climber (well-developed manus claws and
Er... why? The taxa around the base of Avialae seem to be okay runners and
okay climbers (Archaeopteryx, Rahonavis, Microraptor, Jinfengopteryx, Mei).
Other possibilities are:
Unlikely since Epidendrosaurus, basal troodontids (Mei, Jinfengopteryx,
Sinovenator, Byronosaurus), oviraptorosaurs (Incisivosaurs,
Protarchaeopteryx, Caudipteryx), alvarezsaurids and ornithomimosaurs lack
serrations. Basal dromaeosaurs (Microraptor, Cryptovolans,
Sinornithosaurus) have less serrated teeth than dromaeosaurids.
I don't know about this. Jinfengopteryx and Mei have shorter maxillae than
Archaeopteryx and Confuciusornis.
Longer, heavier tail
Maybe. Shenzhouraptor and Jixiangornis both have much longer tails, though
Yandangornis and avebrevicaudans have shorter ones. NGMC 91 has a shorter
tail, but other dromaeosaurs' are much longer. Mei has a shorter tail,
Jinfengopteryx and Sinusonasus have longer ones, and Sinornithoides' is much
longer. Scansoriopteryx's is comparable. Enigmosaurs' are shorter, except
perhaps for Falcarius.
Less pneumaticization in the skull and in other bones
Not sure about this. While some bones trend towards a gain in pneumaticity
(e.g. braincase elements, appendicular elements), others trend towards loss
(e.g. snout and palatal elements). For instance, velociraptorines have
pneumatic lacrimals, nasals and jugals, as well as a ventral ectopterygoid
excavation, unlike Archaeopteryx.
At any rate, this taxon probably lived sometime in the late Triassic or
This I have to disagree with. We don't even have tetanurines from that
early. Falcarius killed the segnosaurian identity of Eshanosaurus. I say
Middle Jurassic, where we have taxa slightly less derived than Archaeopteryx
(Epidendrosaurus), and basal paravians (Pedopenna).