Description: The spotted turtle is small and has a gray to black base color. Its upper shell (carapace) is smooth, does not have a central ridge running down the middle (called a "keel"),[10] and grows to 1.4–4.9 inches in length. It is also totally black and contains anywhere from zero to about one hundred yellow spots, which are a defining characteristic of this turtle. Although perhaps inconsequential, it has been found that the left side of the upper shell has more spots than the right.[9] Spots can always be found on the head, neck, and limbs. The bottom shell (plastron) is yellow or orange-yellow and a black spot is present on each section (scute); however, with age, melanism of the plastron increases until the entire surface is black.
The head is black and the upper jaw is notched. On each side of the head is a large orange blotch. Also present are several yellow bands of varying size.[9] Skin on the dorsal side of the turtle is black with sparse yellow spots while skin on the ventral side may be brighter: orange, pink, or red. These lightly pigmented areas do vary geographically and the tail of some individuals has yellow striping. Regarding the geographical variation in spots, southern individuals tend to have smaller and less conspicuous spots than those of individuals from farther north. The spotted turtle's karyotype consists of 50 chromosomes.
Visual differences between male and female turtles develop around the time of sexual maturity. The male spotted turtle has a tan chin, brown eyes, and a long, thick tail. The chin of the female is yellow; she also has orange eyes and a shorter tail than the male. In addition, the bottom shell of males is concave while it is either flat or convex in females. On average, females grow to be slightly larger than males. Also, females have more spots than males (on average).
Hatchlings resemble the adults closely. Consistently, each segment of the upper shell has only one yellow spot.
Habitat: The spotted turtle occupies a variety of habitats including swamps, bogs, fens, marshes, woodland streams, and wet pastures. Also, brackish streams that are influenced by tides can also serve as a home to this turtle in addition to ditches, vernal pools, and sedge meadows. For a habitat to be sufficient for spotted turtle survival it must have areas of soft substrate and at least some aquatic vegetation. An optimum habitat would include shallow and slow-moving waters with soft muddy soil, sedge tussocks, water lilies, sphagnum moss, and cattails. Because it is so often found in areas that contain duckweed, the yellow spots on these turtles may serve as a form of camouflage. The spotted turtle avoids artificial reservoirs and deep, open-water areas.
The spotted turtle can be decidedly terrestrial, spending a good amount of time on land and sometimes basking on patches of grass near its body of water. The females during times of nesting will travel onto land and lay eggs on sunny soil. Nesting also may take place in other terrestrial locations, for instance near man-made dikes or the nest of a muskrat.
Range: The spotted turtle ranges from southern Maine, Quebec, and Ontario, south along the eastern US to Florida in the east and central Indiana and Ohio in the west. Disjunct populations exist in the Canadian portion of its range and also in central Illinois, central Georgia, North Carolina, South Carolina, and Indiana. In Indiana and Illinois, the species is found only in the northern portion of the state but it is found on most of the lower peninsula of Michigan. The highly fragmented distribution of spotted turtles in Ohio only covers the northern two-thirds of the state.
Diet: The spotted turtle is an active hunter: seeking out prey items in the water by pointing its head into aquatic plants. It feeds at temperatures above 57.6℉, which in its range corresponds to roughly the middle of March onward until September. It is omnivorous and eats exclusively in the water, consuming plant material including aquatic vegetation, green algae, and in at least one instance, wild cranberries. Animal food includes aquatic insect larvae, worms, slugs, millipedes, spiders, crustaceans, tadpoles, salamanders, and several genera of small fish. These items are consumed alive or dead but always in the water. Some of the insects commonly found in with the spotted turtle's stomach contents are terrestrial, suggesting the turtle moves onto land to hunt.
Reproduction: A study in Pennsylvania analyzed the reproductive biology of the spotted turtle. Sexual maturity is not reached until age 8, upon which researchers found that courtship and nesting periods typically ranged from March until June. The courtships involved females being frantically chased by one to several males for approximately 15 to 30 minutes. During the chase, females’ tails and legs were often bit by males. If two males were present, they occasionally stopped the chase to fight with one another and the losing male retreated. When the female was caught, the male mounted her and placed his tail beneath the female while grasping her carapace tightly. Females later constructed their nest in well-drained areas that were exposed to full sunlight. Clutches can range from 1-8 with an average of 3-4. These animals also exhibit Temperature-dependent sex determination, meaning that the outside temperature during the incubation period determines the sex of the hatchling with males resulting from the temperature being lower and females when it's higher. After the eggs were laid, they were arranged in the nest by alternate movements of the hind feet. The hind feet were also used to scrape soil and grass back into the nest cavity. Incubation periods were estimated to range between 70 to 83 days.
Status: In Canada, the spotted turtle is federally endangered, while in the United States the spotted turtle is currently under review by the United States Fish and Wildlife Service for protection under the Endangered Species Act. It is listed by the IUCN as endangered, and has "listed" status in many of the states where it occurs. For example, in Indiana the spotted turtle is listed as an endangered species. In the Northeast, it has protective status in five of the six New England states and is listed as a species of special concern in New York.
Habitat destruction, alteration, and conversion, collection for the pet trade, and other human impacts such as vehicle mortality (cars and mowers) are leading to declines in populations. Vehicular mortality is particularly impactful because turtles crossing roads are likely pregnant female turtles in search of a nesting site. Additionally, since reproductive rates of these turtles are low, spotted turtles are extremely susceptible to population impacts.
Due to their aquatic habitat, these turtles are particularly sensitive to pollutants and toxic substances. They will disappear rapidly from areas with declining water quality.
Disclaimer: ITIS taxonomy is based on the latest scientific consensus available, and is provided as a general reference source for interested parties. However, it is not a legal authority for statutory or regulatory purposes. While every effort has been made to provide the most reliable and up-to-date information available, ultimate legal requirements with respect to species are contained in provisions of treaties to which the United States is a party, wildlife statutes, regulations, and any applicable notices that have been published in the Federal Register. For further information on U.S. legal requirements with respect to protected taxa, please contact the U.S. Fish and Wildlife Service.
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