Query on so-called "correlated" characters

[David Peters <davidpeters@att.net>]

Would the following characters be considered co-related and therefore  
one would be unusable?

1. Height of last sacral neural spine greater than acetabulum  
diameter.    Height of first caudal spine greater than centrum height.

2. Quadratojugal process of jugal present or absent.      
Quadratojugal present or absent.

3. Femur absent.    Number of tarsal bones zero.

4. Naris larger/smaller than antorbital fenestra.    Antorbital  
fenestra present or absent.


I note that in certain recent papers and reviews this has become an  
increasingly sticky subject. I'll weigh in later.

Opinions welcome.

David Peters
davidpeters@att.net