Erythrosuchus

Desojo, Julia B., Ezcurra, Martin D. & Schultz, Cesar L., 2011, An unusual new archosauriform from the Middle-Late Triassic of southern Brazil and the monophyly of Doswelliidae, Zoological Journal of the Linnean Society 161 (4), pp. 839-871 : 869

ERYTHROSUCHUS

Character 8: in Erythrosuchus a foramen is present on the suture between the lacrimal and prefrontal, indicating the posterior opening of the nasolacrimal canal (Gower, 2003; BPI 5207). Accordingly, the character state has been rescored as (1) instead of (?).

Character 15: in Erythrosuchus the ventral process of the squamosal laterally overhangs the proximal end of the quadrate and quadratojugal (BPI 5207). Thus, the character state (1) has been introduced instead of (0).

Character 19: Gower (2003: 23) described that the relationship between the ectopterygoid and the maxilla cannot be assessed with the currently available specimens. Accordingly, we changed the scoring of this character from (1) to (?).

Character 64: following Hutchinson (2001) and personal observations of specimens of the basal archosauriform Erythrosuchus , we consider that the posterolateral trochanter situated close to the midshaft of the bone is homologous with the fourth trochanter of other archosauriforms, probable zone of attachment of the M. caudofemoralis longus (Hutchinson, 2001). This hypothesis is supported by the position of this structure on the femur, which resembles that of other archosauriforms and archosaurs, as well as the presence of another trochanter closer to the femoral head, of posterior position, which seems to be the minor trochanter and insertion area of the Mm. iliofemoralis (Hutchinson, 2001). Accordingly, the insertion areas of the Mm. caudofemoralis longus and iliofemoralis seem to be distinctly separated, with one of them constituting the fourth trochanter. This interpretation contrasts with that of Nesbitt et al. (2009a), who stated that such a structure was absent in Erythrosuchus . A third position is adopted by Gower (2003) who pointed out that there is no consensus that posterolateral trochanter actually represents a homologous structure with the fourth trochanter present in other archosauriforms such as Euparkeria (Ewer, 1965) , Chanaresuchus (PVL 6244), and archosaurs (e.g. Aetosauroides , Marasuchus, Parasuchus , Batrachotomus ; PVL; PVL; ISI R42; SMNS). Accordingly, we have scored the character state as (1) for this character (i.e. present), as it was also codified by Dilkes & Sues (2009).