[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Removing segnosaurs from Theropoda
In a message dated 95-08-29 18:33:51 EDT, email@example.com (Jerry
D. Harris) writes:
> Yes, they could...and this sort of thing happens a _lot_ in
>cladistics, only because the cladist doesn't describe _specifically_ what
>is unique about the trait they're using -- they just mention the trait
>(e.g., saying "fused metatarsals." So what? Artiodactyls have fused
>metatarsals, but they look different than those of, say, birds or theropods
>-- just saying "fused metatarsals" doesn't cut it, IMHO). The cladist
>needs to delineate precisely what is unique about the feature they're using
>for it to be truly a synapomorphy. Thus, when one just says "interdental
>plates," then I'd have to say it's a useless character because interdental
>plates exist in a variety of organisms which are clearly distantly related.
>There's nothing I hate more than scouring some cladist's list of
>synapomorphies and saying "Well, this animals also has trait 9, and this
>group also shows trait 14," because it negates the utility of what the
>cladist is saying (or, at least, trying to say).
Right on, Jerry!