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Of sails and humps

Hello dear DMlers
following recent posts on sails and humps, I was wondering if some Ichthyosaurs 
could have had sials behind their dorsal "fin" (like that kind of sword fish of 
which English name I can't remember, French is Marlin). I was thinking 
particularly about *Eurhinosaurus* whose shape reminds me roughly of such a 
fish, apart from the sword, of course. Is it plausible that some Ichthies may 
have had such a structure? I mean, is there any evidence for or against it? (If 
it has some use in modern fish, it may have had the same in Ichthies)