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
Lesueur also described _Trionyx ocellatus_ (_op. cit._:261-263) as a
variety of _T. spiniferus_ having ocelli, or parts thereof, on the
carapace and mentioned three specimens. The total number of specimens
that were available to Lesueur is unknown. One young alcoholic
specimen having ocelli is in the British Museum (Natural History)
(Gray, 1855:69). The same letter from Dr. Guibé stated that a specimen
in the Museum of Natural History, Paris, No. 6957, having a carapace
17 centimeters in length, conforms to the characters of _ocellatus_ as
mentioned by Lesueur, and was obtained from the Wabash River by
Lesueur. Two of the specimens mentioned by Lesueur (_loc. cit._) are
stated to be females. No. 6957 is an adult male and clearly shows the
juvenal pattern; it is regarded as the lectotype of _T. ocellatus_
Lesueur, a name-combination, which is a synonym, based on a secondary
sexual difference in pattern.
Rafinesque (1832:64) described a soft-shelled turtle from "the River
Hudson between the falls of Hadley, Glen and Baker, and further up to
the source" as _Apalone hudsonica_. The most outstanding
characteristic was the presence of five claws on the digits of each
limb. Rafinesque's recording of this characteristic was perhaps
influenced by the illustration of a softshell in Bartram's _Travels_
that showed each limb with five, clawed digits. Perhaps this was the
basis for Boulenger (1889:245, footnote) regarding _Apalone_ as
"mythical." The large, yellowish, black-bordered spots, one behind and
one in front of the eye presumably represent segments of the
postocular stripe and the stripe on the snout; Rafinesque described
the carapace as "entire ... the margin is yellowish unspotted, then
comes a circular black line ..." and having "many round spots
occulated and clouded by having a brown margin, with grey dots
within." Except for five claws, the description is applicable to a
softshell and referable to _T. s. spinifer_. To my knowledge, the only
other records of the occurrence of soft-shelled turtles in the Hudson
river drainage are those of Eights (_in_ Bishop, 1923:120, Mohawk
River at Cohoes), and DeKay (1842:7, Mohawk River and Hudson River
near Albany); presumably these records are the basis for the comments
of Holbrook (_in_ Bishop, _loc. cit._), and symbolized as an isolated
locality by Conant (1958:318, map 35). The type locality of _Apalone
hudsonica_ is herein restricted to the Hudson River, near Baker's
Falls, Saratoga County, New York.
Public-domain text, read in full here on John Shaqi.
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