A new early Late Oligocene (MP 26) continental vertebrate fauna from Saint-Privat-des-Vieux (Alès Basin, Gard, Southern France)
Author
Vianey-Liaud, Monique
Author
Comte, Bernard
Author
Marandat, Bernard
Author
Peigné, Stéphane
Author
Rage, Jean-Claude
Author
Sudre, Jean
text
Geodiversitas
2014
2014-12-26
36
4
565
622
http://dx.doi.org/10.5252/g2014n4a4
journal article
6390
10.5252/g2014n4a4
8bc26961-9853-4113-a63d-4cf691aa7100
1638-9395
4538625
Pelophylax
sp.
(
Fig. 1D, E
)
MATERIAL EXAMINED. — Four incomplete maxillae (
SPV
718), one angular (
SPV
719), one vertebra (
SPV
720), one urostyle (
SPV
721), one humerus (
SPV
705), six ilia (
SPV
704 and
SPV
722).
DESCRIPTION
Ŋe ilia bear a high dorsal crest; the posterior bor- der of the crest is thickened and it forms the
tuber superius
. Ŋis
tuber
rises rather steeply with regard to the
pars ascendens
and its anterior limit is clearly marked. On the angular, the coronoid process is almost vertical. Ŋe single available vertebra is amphicoelous; it is therefore the 8
th
, i.e. the last presacral vertebra. Ŋe urostyle has two circular cotyles, well-distinct from each other. Ŋe diaphysis of the humerus was likely straight and the humeral condyle is in line with its axis. Ŋe infraorbital area of the maxillae is shallow and not ornamented.
DISCUSSION
Ŋe ilia do not preserve their ischiatic processes; however, the dorsal crest is higher than that of alytids and the posterior border of the
tuber superius
is closer to the vertical. Ŋese features, as well as the nearly vertical orientation of the coronoid process and the axial position of the humeral condyle point to the
Ranidae
. Ŋe amphicoelous condition of the vertebra corroborates this referral since the 8th vertebra of ranids and other ranoids is amphicoelous. Ŋe morphology of the urostylar cotyles and the shallowness of the infraorbital area of the maxillae are not diagnostic characters, but they are consistent with the
Ranidae
.
Within
Ranidae
, this fossil is referred to the water (or green) frogs,that is to the genus
Pelophylax
.Mainly, the steep slope of the
tuber superius
, in lateral view, is a conspicuous characteristic of this genus.In addition, the height of the dorsal crest and the marked anterior limit of the
tuber superius
support this assignment.
Pelophylax
, an extant genus, is first reported in the early Oligocene (MP 22) of
Germany
(
Sanchiz
et al.
1993
). Ŋese frogs do not live permanently in fresh water, but they live close to and they often enter it.