Description:
"The reptile fauna of the Eocene Pondaung Formation of central Myanmar
(Fig. 1) has received little attention compared to its well-known
mammalian fauna (e.g., Colbert, 1938; Tsubamoto et al., 2000). In prior
reports, Buffetaut (1978) described indeterminate crocodylians and dyrosaurids.
Hutchison et al. (in press) described carettochelyid, trionychid,
testudinoid, and pelomedusoid turtles from the formation. They additionally
noted the presence of agamid lizards, a pristichampsine crocodilian,
and snakes. The snakes are described here.
The occurrence of snakes in the Pondaung Formation is significant
because the fossil history of Paleogene South Asian snakes has historically
been under studied relative to the North American and European
records (e.g., Rage, 1984; Szyndlar, 1984; Holman, 2000), despite hypotheses
predicting the region as the origin of extant clades (e.g., Underwood
and Stimson, 1990; Rage et al., 1992). The South Asian record consists
primarily of marine palaeophiid taxa as well as terrestrial/terrigenous
specimens referred to Boidae (Boinae + Erycinae, Table 1). The only
derived snakes from the South Asian Paleogene are six colubrid vertebrae
from the late Eocene Krabi Basin of Thailand (Rage et al., 1992)
and a single vertebra referred to Colubroidea (possibly Colubridae) from
the early Eocene of India (Rage et al., 2003). The absence of coeval
colubroids elsewhere (Rage, 1988), combined with the occurrence of the
Krabi Basin record, led Rage et al. (1992) to conclude that Asia represents
the center of origin for Colubridae, the most speciose and diverse
extant snake clade..."
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Source/publisher:
Journal of Vertebrate Paleontology 25(1):246?250, March 2005
Date of Publication:
2005-03-00
Date of entry:
2008-01-01
Grouping:
- Individual Documents
Category:
Language:
English