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FIGURE 3.—Distal end of humerus of Dryornis pampeanus (MLP 20-169; lectotype):
a, palmar view; b, anconal view.
15.8; depth of midshaft, 16.4. Radius: Distance between head
and capital tuberosity, 21.
DESCRIPTION.—The ulna differs from those of other condor
genera by having the following features: (1) olecranon developed
as in Vultur, larger than in Gymnogyps or Geronogyps;
(2) olecranon directed medially; (3) the humero-ulnar depression
well excavated; (4) incisura radialis shallower than in Vultur,
Gymnogyps, or Geronogyps and located less medially; (5)
SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY
FIGURE 4.—Proximal end of humerus of Vultur gryphus (MLP 48-XII-l 6-225)
in anconal view. Scale bar= 1 cm.
impressio brachialis beginning more proximally than in Vultur
and lacking foramina, unlike Vultur, Geronogyps, or Gymnogyps;
(6) base of the processus cotylaris dorsalis palmarly excavated;
and (7) papillae remigiales situated on midline of dorsal
surface, but situated more mediad in Vultur. The bone is damaged
at the level of the prominence for the tubercullum lig. collateralis
ventralis. There are only 12 anconal papillae for attachment
of secondary remiges preserved.
The radius is characterized by having (1) strong tuberculum
bicipitali radii, as in Geronogyps; (2) deep and rounded bicipital
attachment; (3) capital tuberosity (in the sense of Howard,
1929) prominent and limited internally by a deep notch, as in
Geronogyps; and (4) capital tuberosity doubly pierced with
large foramina.
REMARKS.—The preserved bones of MLP 90-X-l-l are approximately
20% longer than those of either modern condors or
Geronogyps. The features mentioned below make the fossil too
different to be referred to any recent genus of fossil vultures;
nevertheless, it would be imprudent to name a new genus and
species until more complete material is recovered.
Geronogyps reliquus Campbell, 1979
REFERRED MATERIAL.—Left humerus, partially broken,
CCM Nro 95-VI-5-1 and 95-VI-5-4 (Figure 7); left margin of
Arroyo Chasico, close to its mouth (38°30'S, 63°W), Villarino
County, Buenos Aires Province; Pleistocene, sensu lato.
MEASUREMENTS (in mm).—Depth of head, 19; distance between
tuberculum dorsale and insertion of M. scapulohumera-