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Re: BAD vs. BADD (was: Re: Most popular/common dinosaur misconceptions)
So these papers you mention, do they refer to annelids now as
Yes. They sure do. Or they use similar PN terms (e.g., non-vestimentiferan
pogonophorans, non-clitellate polychaetes, non-siboglinid annelids, etc).
For some relevant references, check out:
Cladistics started in entomology. Phylogenetic nomenclature seems to have
vertebrate (dinosaur) paleontology. Class, order, family and all the other
ranks still abound in
Yes, but even with insects, there is no universal agreement on (1) exactly
how many orders there should be; or (2) the 'rank' of several of these
orders. When I took a class in entomology as an undergrad I remember that
certain entomologists preferred to give each of the apterygote orders
(primitively wingless hexapods, such as Collembola, Diplura, etc) their own
class, each 'equivalent' in rank to class Insecta. Thankfully, PN
eliminates the need for such unproductive arguments over 'rank'.
More recently, there is disagreement over whether the insect group
Dictyoptera should be split into three orders (Isoptera, Blattaria,
Mantodea), or treated as one order with three suborders.
The point of this foray into entomology is that the rank-based
classification of insects is not as simple or stable as you make it seem.
The concept of order is entirely arbitrary.
Cetacea never evolved from Mammalia. It evolved within Mammalia.
There's no difference.