96


Journal of Paleontology 90(1):92–101


Figure 5. Selected humeri of procolophonians. (1) SMNS 92101, left humerus of Owenettidae indet. from Germany in dorsal and ventral views. (2) SMNS 91753, left humerus of Procolophonidae indet. from Germany in dorsal and ventral views. (3) The owenettid Barasaurus besairiei, left humerus in dorsal view of holotype and left humerus in ventral view of specimen P6, modified from figs. 10 and 13 of Meckert (unpublished data, 1995), respectively. (4) The procolophonid Procolophon trigoniceps, right humerus (inverted) in dorsal and ventral views, modified from fig. 10 of deBraga (2003). Gray areas indicate broken bone. ectn = ectepicondylar notch; entf = entepicondylar foramen; sp = supinator process. Scale bar = 5mm.


Table 1. Measurements of the described humeri from the Middle Triassic Erfurt Formation (lower Keuper), Germany. Values are in centimeters; *indicates a partial value due to incompleteness or postmortem deformation.


SMNS– 92101


Humeral length


Maximum proximal width Maximum distal width


Minimumanteroposterior shaftwidth 0.60 Maximum dorsoventral distal deep


4.10 1.87 1.93


0.70


SMNS– 92100


1.00* 0.60*


5.22* 2.64* 2.72


SMNS– 91753


0.76* 1.20 0.31


2.50 0.14*


correspond to the humeral head, is well defined on the most dorsal side of the proximal articular surface, seen in proximal view (Fig. 1). The head is slightly convex and faces poster- odorsally; the ventral extent of the head is unclear. Poster- oventrally, the proximal articular surface is separated from the lesser tuberosity by a distinctive concave, notched surface. The proximal articular surface, especially the proximodorsal area of the head, has a rough texture, indicating an area of cartilage cover. Along this region, the “greater” tuberosity is not defined.


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