North American Recent Soft-Shelled Turtles (Family Trionychidae)Webb, Robert G. (Robert Gravem)
Science
North American Recent Soft-Shelled Turtles (Family Trionychidae)
Webb, Robert G. (Robert Gravem)
Soft-shelled turtles
One of the immature softshells (KU 51979, plastral length, 9.7 cm.) of
the series from Lajitas is considered to be a female. It combines
characteristics of both sexes. It resembles a male in having a carapace
gritty to the touch, in having prominent white dots posteriorly and in
not having a faint mottled and blotched pattern as do females of the
same size. The postocular and postlabial markings are mostly yellow
(female), but a small patch of the postocular stripe near the junction
with the pale ventral coloration laterally is tinted with orange (male);
the morphological characters and secondary sexual difference in
coloration of this series of softshells has been mentioned on page 512.
The tail is short and pyramidal resembling that of a female. Internally,
there are a pair of ovaries and oviducts; KU 51979 is functionally a
female. An over-production of androgens probably is responsible for the
external masculine characteristics (orange color, gritty carapace and
absence of mottling on carapace).
_Deposition of Eggs_
Concerning _T. ferox_, Wright and Funkhouser (1915:122-23) wrote that
deposition of eggs occurred in June and July in the Okefinokee Swamp
on the sandy parts of the islands or in sandy fields in places exposed
to the direct rays of the sun. The same authors recorded a gravid
female taken on June 22 (_op. cit._:120), and a nest with eggs on June
26. Harper (1926:415) reported egg-laying in June in the Okefinokee
Swamp. Goff and Goff (1935:156) found a female in search of a nesting
site crawling toward a cleared area within a hammock at 11 a. m. on
May 19, about 25 yards from the western shore of Lake Griffin,
Florida. Carr (1940:107) stated that eggs in Florida "are laid from
March to July 10. One individual laid her eggs on a block of ice which
we had buried in the sand." Hamilton (1947:209) observed deposition of
eggs near Fort Myers, Florida, in "a sandy roadbed slightly above the
cypress swamp and ditch levels on either side of the road." ... either
in ... "the ruts formed by cars or the slope of the roadbed"; dates of
deposition of eggs recorded are March 30 at 11 a. m. in bright sun,
and March 31 (from context, the date given as March 21 is considered
an error) at 5 p. m. following a heavy rain. The daily temperatures at
the time of Hamilton's observations "averaged 85° F., the first really
warm spell of the season."
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