Sankuchemys, a New Side-Necked Turtle (Pelomedusoides: Bothremydidae) from the Late Cretaceous of India
Author
GAFFNEY, EUGENE S.
Author
FORSTER, CATHERINE A.
text
American Museum Novitates
2003
2003-05-22
3397
1
11
http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29397%3C0001%3ASTLJPB%3E2.0.CO%3B2
journal article
10.1206/0003-0082(2003)397<0001:STLJPB>2.0.CO;2
0003-0082
Sankuchemys
,
new genus
TYPE
SPECIES
:
Sankuchemys sethnai
,
new genus and species
.
DISTRIBUTION: Maastrichtian of
Bombay
,
India
.
ETYMOLOGY:
Sankuch
, ‘‘compressed’’ in Sanskrit, in allusion to the remarkably crushed
type
specimen.
DIAGNOSIS: A genus of bothremydid pleurodire with triangular skull, orbits dorsolaterally placed; extensive temporal emargination and small postorbital as in
Kurmademys
(
Gaffney et al., 2001b
)
and in contrast to all other bothremydids; triturating surfaces roughly parallel and without pits, but with accessory ridge parallel to labial ridge unique among bothremydids; foramen posterius canalis carotici interni formed by pterygoid and basisphenoid in contrast to basisphenoid only in
Kurmademys
; foramen stapediotemporale not visible in dorsal view as in other bothremydids, but in contrast to
Kurmademys
; prootic and foramen nervi facialis exposed in ventral view as in
Kurmademys
.
DISCUSSION: Although many characters are visible in the
type
skull of
Sankuchemys
, one important area completely wrecked in SDS/ VPL 1125 is the cavum tympani. This region has many characters important in bothremydid systematics (
Gaffney et al., 2001a
,
2001b
) that are not determinable for this taxon. The occiput is also reduced to two dimensions completely obscuring foramina and features in that area. Nonetheless, SDS/VPL 1125 does preserve enough characters to show its distinctness from all other taxa and to test its relationships using currently available hypotheses.