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Re: A Wild Hare [not dino related]
Long answer: Recent molecular studies have thoroughly refuted the
hypothesis that bats are diphyletic, with megabats closer to primates.
Last I heard, molecular evidence was even indicating that
Microchiroptera is actually paraphyletic with respect to
Specifically, megachiroptera come out near Rhinolophoids (if memory
serves). That's additionally interesting given that Rhinolophoids have
a distinct echolocation system from other microchiropterans. Since
it's not dinos, I'll leave it at that. Those that would like refs on
flight and echolocation differences between Rhinolophoids and other
microchiropterans can contact me off-list (I have a number on hand).
1. Do eurymlids have a large diastema like Gomphos, lagomorphs and
Not familiar with them.
I think they have some kind of diastema; mimotonids have a larger one,
if I remember correctly (Mimotonids may be a lagomorph sister taxon).
Not really. Highly related to food processing; diastemata appear to
have arisen many times among mammals.
True, they do pop up a lot. I've heard a few different thoughts on why
diastema appear, but personally I suspect a particular pairing of
mechanical advantages selects for diastema. Specifically, if an animal
is combining a few teeth for snipping with a few sets of teeth for
crushing, it derives significant mechanical advantage from putting the
crushing teeth near the fulcrum (for high force) and the snipping teeth
far from the fulcrum (for control). But that requires space between
the two sets; hence a diastema. Just a thought.