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where do proterochampsids belong?



Here's what the literature says: 
(if I missed any let me know).

Gauthier 1986
Proterochampsidae derived from Erythrosuchidae, outside of Parasuchia + Suchia

Benton and Clark 1988, Benton 1990, Bennett 1996
Proterochampsidae derived from Erythrosuchidae, outside of Euparkeria

Sereno 1991
Proterochampsidae derived from Euparkeria, outside of Ornithodira + Parasuchia

Parrish 1993, 
Proterochampsidae derived from Euparkeria, outside of Ornithodira

Benton 1999
Proterochampsidae and Euparkeria are basal to all other traditional 
archosauriformes (proterosuchids and erythrosuchids not listed).

Question is: which is correct? 


David Peters
St. Louis