. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . thought to havebeen present in the earliest archosaurs, but are instead currently considered to be asynapomorphy of the more derived group £w/?ar&ena+Proterochampsidae+crown-grouparchosaurs ( Benton & Clark 1988; Sereno 1991). Three specimens of Erythrosuchusafricanus suggest, however, that osteoderms have a wider distribution among archosaurs. In his description of the holotype SAM-905, Broom (1906) briefly mentioned anelement that he believed to be an unpitted dermal ossification (see also footnote in Charig&
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . thought to havebeen present in the earliest archosaurs, but are instead currently considered to be asynapomorphy of the more derived group £w/?ar&ena+Proterochampsidae+crown-grouparchosaurs ( Benton & Clark 1988; Sereno 1991). Three specimens of Erythrosuchusafricanus suggest, however, that osteoderms have a wider distribution among archosaurs. In his description of the holotype SAM-905, Broom (1906) briefly mentioned anelement that he believed to be an unpitted dermal ossification (see also footnote in Charig& Reig 1970: 133). A re-examination of this material has unfortunately failed to identifywhich element Broom was referring to. Juul (1994: 6) reported the presence of roundedosteoderms in BPI 5207, but that the arrangement of these is uncertain. The presence ofosteoderms in BPI 5207 was not noted during examination of that specimen in the courseof this study. The third specimen is BMNH R3592, which includes two possible 70 ANNALS OF THE SOUTH AFRICAN MUSEUM 15 mm.
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
