FLORIDA'S FRESHWATER TURTLES

MAIN INDEX | Aquatic plants, plant management and turtles |
Anatomy and behavior | Turtle species identification | Conservation |

Turtle meeting
Whether they are basking on logs or buried in the bottom, aquatic turtles can be found in nearly any body of freshwater in Florida. Springs, rivers, lakes, ponds, wetlands, and even canals with vegetation provide turtle habitat. Descendents of a primitive species that roamed the earth more than 200 million years ago, long before the dinosaurs, turtles have remained essentially unchanged for the past 150 million years. Turtles are recognized by everyone.

Like snakes and alligators, turtles are reptiles. There are about 50 species of turtles in North America. Within their preferred habitats, Florida's freshwater turtles spend a portion of their day basking together (even on top of one another) along sand banks, on floating logs, and on rocks. At other times, these lung-breathing animals can be found discretely floating just below the surface water with only their nostrils protruding above.

Florida's freshwater turtle population is diverse, and different species prefer different environmental conditions such as fast or still currents, muddy or sandy bottoms, and vegetated or open banks. Despite the varied environmental preferences, aquatic turtles in Florida share anatomic similarities (see below); learning the subtle differences facilitates easy identification and appreciation of some of Florida's oldest native denizens.


Florida Cooters
(Pseudemys floridana)
Suwannee Cooters
(Pseudemys concinna suwanniensis)
Suwannee Cooters & Florida Cooter (on right)

Suwannee Cooters
Yellow-bellied slider
(Melanistic male, Trachemys scripta scripta)
Florida red-bellied turtle
(Pseudemys nelsoni)

Gopher tortoise
(Gopherus polyphemus )


Some Native Aquatic Plants Used by Freshwater Turtles in Florida

Turtles are known to eat and to prefer the habitats provided by native plants of these genera:
Bidens, Brasenia, Carex, Ceratophyllum, Eleocharis, Juncus, Lemna, Najas, Nuphar, Nymphaea, Polygonum, Potamogeton, Rhynchospora, Riccia, Ricciocarpus, Sagittaria, Sambucus, Scirpus, Spirodela, Typha, Vallisneria, Wolffia and Wolffiella, as well as some species of algae.

AQUATIC PLANTS, PLANT MANAGMENT AND TURTLES
Turtles, aquatic plants, and aquatic plant management are intimately associated. Turtles eat aquatic plants, sleep among plants, and hide among plants. Some turtles even mimic aquatic plants. The spotted shells of the Blanding's turtle and the spotted turtle imitate duckweed, concealing them from predators, and also concealing them from prey: dragonflies land on the "duckweed" and are eaten by the lucky turtles.

Turtles can make lake revegetation efforts very difficult: turtles may devour transplanted plants as fast as the plants can grow. Turtles are sometimes in peril in plant management operations, such as when aquatic plant harvesting machines also harvest turtles. In one site during a three-month period, plant harvesting machines also removed and killed about 700 snapping and painted turtles. In another study, the threatened bog turtle was reduced by an invasion of the non-native plant, Pharlaris arundinacea. Other, more natural, perils also exist. For example, redbelly turtles sometimes lay their eggs in alligator nests (made of plant material), as described on our alligators page, and sometimes the redbellies are eaten for doing so...

Many turtles prefer to live amongst certain aquatic plants. Many turtles are omnivores and eat aquatic plants along with aquatic animals. Some turtles are vegetarians and eat only aquatic plants. In one habitat created to help the endangered bog turtle, researchers planted the following plants: Carex stricta, Sagittaria latifolia, Onoclea sensibilis, Juncus effusus, and Scirpus cyperinus.

Link here to learn about turtles and their impact on aquatic plants


ANATOMY and BEHAVIOR
Learning a bit about a turtle's anatomy and behavior can help wildlife observers distinguish one species from another.

Turtles are characterized by a bony shell that provides protection. The top part of the shell is called a carapace. Noting the shape, color and markings on the carapace is very useful in identifying the species.

The lower portion of the shell is called the plastron and it may be of a different color or have different markings from the carapace. The shape of the plastron reveals the sex of the turtle: a male's plastron is concave in order to facilitate mating; the female's plastron is flat.

The plastron and carapace are covered with hard keratin plates called scutes, which comprise the mosaic of the shells. If there are ridges on the shell or tail, they are called keels. Keels and scutes create the hard, armor-like texture of the shell that provides protection for the turtle. All turtles must spend several hours basking in the sun in order to dry out the scaley skin on their legs and head and to harden their shell.

The hardened shell provides refuge for a frightened turtle that can easily retract its legs and head between the plastron and carapace. Unlike seaturtles, freshwater turtles can fold their neck and retract their head. This ability evolved during the Jurassic Period when turtles branched into two groups that developed neck retraction separately. Side-necked turtles are found in the southern hemisphere and withdraw their heads sideways. In contrast, arch-necked turtles retract their heads in an s-shaped curve. Arch-necked turtles are the most prolific group and include the box, pond, subaquatic turtles, and tortoises.

The head of an aquatic turtle is sleek and does not have an external ear. Nostrils are located on top of the snout, enabling the turtle to submerge most of its head beneath the water. Many turtle species have unique markings on their heads that often enable accurate identification, even if a turtle is partially submerged.

Beneath the water's surface, turtles spend their day sleeping either along the bottom or in dense vegetation, or searching for food. Freshwater turtle diets vary as carnivorous species prey on crayfish, fish, and insects, and vegetarians graze on aquatic plants. (See "Aquatic plants" above.) Still, many omnivore species are opportunistic, taking advantage of plant and animal food sources. Although turtles are the only toothless reptile, their sharp beaks catch, cut, and slice through prey and sever vegetation for food and nest building.

While some species take advantage of lodges previously constructed by muskrats, beavers, and alligators, most turtles dig their own burrows with their flat feet, webbed toes, and sharp claws. Turtles are proficient diggers that easily construct burrows in dry land where all female turtles, even aquatic species, lay their eggs.

The female turtle's digging abilities outshine her mothering habits: she deposits her eggs, covers them, and abandons her nest. Sharp-eyed crows, raccoons and other predators sometimes destroy the turtle nest almost as soon as the mother returns to the water. After incubation, the baby turtles break out of their eggs and claw their way out of the dirt to the surface. They then have only their instincts to protect them from the threats of predators such as alligators, birds, snakes, mammals, and humans.


MOST COMMONLY SIGHTED
The following list includes 16 of the most commonly sighted aquatic turtles in Florida and their key identifying characteristics. Species are distinguished most readily by their shells.

Snapping turtles (Chelydra serpentina) grow to 18 inches long and to 20-30 pounds. The snapping turtle has a black or dark dark brown shell. Its large head is supported by a very long bumpy neck. It catches and eats fish and even birds. They prefer freshwater habitats with a muddy bottom and rarely leave the water, except to nest. Snapping turtles are known to bite.

See this University of Georgia link for more complete information: Chelydra serpentina
snapping turtle

Alligator snapping turtles (Macroclemys temmincki) can grow as large as 31 inches, and to 150 pounds, making it the largest freshwater turtle in the U.S. and one of the world's largest freshwater turtles. Partly because it is hunted and killed for food (alligator snapping turtle soup), this animal is a species of special concern. Alligator snapping turtles may be recognized by their large size, the tall ridge on the back of their very rough shells, their very large triangular heads (to 9 inches wide!) and their very long tail. They are seldom seen because they are "bottom walkers" and rarely leave their deep rivers and canals, except to nest. Alligator snapping turtles have evolved a worm-like "fishing lure" that dangles from their open mouths which snap shut when a curious fish is lured in. These turtles are primarily found in the panhandle region of Florida.

See this Army Corps of Engineers link for more complete information: Macroclemys temmincki
(this is a PDF file)

Common mud turtles (Kinosternon subrubrum) are very small, rarely growing to four inches long. A common mud turtle has a black head with two thin yellow lines. Its smooth shell is olive to brown. Males have a spine at the end of the tail. It will secrete a foul fluid when harrassed. The common mud turtle prefers fresh or brackish marshes and ponds where it often occupies muskrat lodges. It may also use a beaver lodge or alligator nest to lay its eggs. Common mud turtles eat insect larvae and other small aquatic animals.

See this University of Georgia link for more complete information: Kinosternon subrubrum
common mud turtle

The striped mud turtle (Kinosternon bauri) grows only to five inches long. It has three light stripes on a smooth shell. The stripes may fade as the turtle ages. The male has a spine on the tip of his tail. The striped mud turtle is the most land-loving of the mud turtle group, and may be found in puddles or small retention ponds. It feeds on snails, insects, dead fish, and some vegetation. It is also known as the "cow dung cooter" because it is sometimes found foraging in manure.

See this Audubon link for more complete information: Kinosternon bauri
striped mud turtle

Common musk turtles, or stinkpots (Sternotherus odoratus) average only five inches in length. The common musk turtle has a large pointed black head with yellow stripes and barbels on the side of the head. It has a smooth brown to grey shell that is often covered with algae. This turtle exudes a foul musk-like smell when it is harrassed. Although stinkpots are relatively harmless, aggressive males will bite. Common musk turtles prefer slow-moving streams and ponds where they may be seen basking on logs and low trees; they seldom come to shore. They may use a muskrat lodge to nest.

See this University of North Carolina link for more complete information: Sternotherus odoratus
common musk turtle

The loggerhead musk turtle (Sternotherus minor) grows to about five inches long. This turtle has a brown to orange shell that may be patterned with spots or streaks. It is pink or yellow on the underside. The head has dark spots or stripes. Barbels protrude from the chin only. The male has a large spine on the tip of the tail. The loggerhead musk turtle may be found in springs, sinkholes, rivers, and swamps where they crawl along the bottom. Like the stinkpot, they are extremely odorous.

See this Davidson College link for more complete information: Sternotherus minor
loggerhead musk turtle

Chicken turtles (Deirochelys reticularia) can grow to ten inches long. They have a long, brownish carapace (top shell) with shallow furrows, having yellow net-like markings. The plastron (bottom shell) is solid yellow. The undersides of the head and legs are yellow with dark stripes. The rear edge of the shell is smooth. The male is much smaller than the female. They have very long necks. The chicken turtle prefers shallow water of ditches and ponds with thick vegetation and may be found basking on logs or wandering on banks. They will bite. Chicken turtle meat is sometimes eaten in southern states.

See this University of Georgia link for more complete information: Deirochelys reticularia
chicken turtle

The river cooter (Pseudemys (Chrysemys) concinna) is a species of special concern. It is about ten inches long and may be the fastest swimming of all turtles in the U.S. River cooter shells are brown or olive with fine cream-yellow lines. They can be found basking on logs in springs and rivers with moderate currents. They are quick to dive in the water when appraoched. "Cooter" comes from the word, "kuta", which means "turtle" in several African dialects. River cooters are vegetarian turtles, and feed on native aquatic plants like Najas, Sagittaria and Ceratophyllum. River cooter is frequently eaten in the South.

This turtle is closely related to the Suwannee cooter (Chrysemys concinna suwanniensis). The Suwannee cooter is listed as a threatened species; they used to be plentiful but have been killed and eaten, and have also suffered from diminshed food plants in its favored habitats.

See this University of Georgia link for more complete information: Pseudemys (Chrysemys) concinna


The common cooter (Pseudemys (Chrysemys) floridana) averages twelve inches long. It is black or brown with yellow stripes. Common cooters prefer dense aquatic vegetation in ponds, marshes, rivers, and spring runs. They occassionally venture onto land.

See this University of Georgia link for more complete information: Pseudemys (Chrysemys) floridana
common cooter

Florida redbelly turtles (Pseudemys (Chrysemys) nelsoni) grow to about ten inches long. The shell is black with red-brown bars and reddish on the underside. They have black heads with narrow yellow stripes that shape into an arrow on the snout. There is a large notch at the tip of the upper jaw. Florida redbelly turtles feed on aquatic plants in ponds, marshes, lakes, and mangrove lined creeks.

See this Audubon link for more complete information: Pseudemys (Chrysemys) nelsoni
Florida redbelly turtle

The yellow-bellied slider turtle (Trachemys scripta) grows to eight inches. It is black with yellow bands on each side. Yellow-bellied sliders frequent areas having soft bottoms and dense vegetation.

The red-eared slider (Trachmys scripta elegans) is a subspecies native to the Mississippi River basin. Introduced through the pet trade, it competes with the red-bellied turtle and breeds with native yellow bellied sliders.

See this University of Georgia link for more complete information: Trachemys scripta
yellow-bellied slider turtle

The Florida softshell turtle (Trionyx ferox) has a flat grey to brown head with orange or yellow streaks radiating from a pointed nose. The shell is actually hard, covered with a leathery skin; the shell edge is soft and there are no horny scales. The male grows to eight inches long and the female can reach sixteen inches long and longer. Softshell turtles have very long necks, sharp beaks and ugly tempers - their heads can reach a person holding them from behind. The largest softshell can weigh 35 pounds. They are hunted and eaten by some people. They prefer sandy or muddy bottomed lakes, canals, and springs where they may be found floating in the water or buried in the bottom. Florida softshell turtles feed on snails, amphibians, crayfish, and sometimes small birds.

A smaller, rare relative is the gulf coast smooth softshell turtle (Trionxy muticus calvatus). This turtle is medium size, to 9 inches long, and lives in rivers, streams and lakes.

See this link for more complete information: Trionyx ferox
Florida softshell turtle

Barbour's map turtle (Graptemys barbouri), a rare species of special concern may be found in the Chipola and Apalachicola Rivers. Its knobbed shell is olive grey to brown with yellow "U" markings. It has large yellow or greenish markings behind the eyes. Males can grow to only five inches long; females may reach twelve inches. Barbour's map turtle eats insects, snails, and crayfish. This species has been heavily collected, and as a result the population has dwindled.

See this link for more complete information: Graptemys barbouri

Alabama map turtle (Graptemys pulchra) males grow to five inches; females grow to 11 inches long. It has an olive to greenish-brown shell with a black stripe. The underside is yellow with black seams. The head has large yellow or green spots, and yellow or orange stripes run down the neck. Males eat insects; females eat snails and clams. The Alabama map turtle may be found in the western-most tip of the Florida panhandle in creeks of the Escambia and Yellow Rivers where it may live to be 50 years old.

See this link for more complete information: Graptemys pulchra
Alabama map turtle

The spotted turtle (Clemmys guttata) may grow to five inches long. This rare turtle has a smooth shell, its legs and head are black with orange or yellow spots, and its underside is cream-colored. Males have brown eyes, females have orange eyes. They eat insects, tadpoles and small fish. The spotted turtle may be found basking along slow moving streams and in shallow woodland ponds in northern Florida during the cooler months, but they are also seen on land as well.

See this University of Georgia link for more complete information: Clemmys guttata
spotted turtle

The eastern box turtle (Terrapene carolina) is primarily terrestrial although it may be found in wet meadows and floodplains. It grows to nearly nine inches long. The shell may be tan, brown, yellow, or orange. Males have red eyes and female have yellowish eyes. Females store sperm and produce several eggs after a single mating. Box turtles feed on slugs, worms, strawberries, and mushrooms. It can live more than 100 years.

See this link for more complete information: Terrapene carolina
eastern box turtle

Additional identification information may be obtained through the National Audubon Society's Field Guide to Reptiles and Amphibians. Audubon's Corkscrew Wildlife Sanctuary website also offers a
Turtle I.D. Printout (this is a PDF file) for eight commonly sighted freshwater turtles in Florida.


CONSERVATION
Today, more than 250 species of turtles roam the planet and more than half thrive in freshwater. Florida's aquatic turtles depend on healthy freshwater springs, rivers, swamps, marshes, lakes, and ponds to supply native habitats and food sources.

Overdevelopment, water contamination and invasive aquatic plants threaten the future of Florida's native turtle species. Highway traffic and shooting of basking turtles also take a high toll. In at least one place, special turtle passages have been constructed to allow turtles to safely cross busy highways: learn about the Lake Jackson Ecopassage. Please do not paint a turtle's shell - the paint deforms the shell and may kill the turtle.

Turtles have managed to endure for more than 200 million years on earth. Conservation and protection of Florida's fresh waterways will ensure that in Florida, turtles will survive many more.


For more information about Florida's freshwater turtles, visit:

Florida Wildlife Conservation Commission

Everglades National Park


The Creators

This page was authored by Sarah Cervone, with contributions from Vic Ramey.
Data is from the APIRS database.
This page was designed by Becca Hassell.
Photography and graphics are by Ann Murray, Sara Reinhart and Vic Ramey.

Turtle identification provided by Matt Aresco with www.nokuse.org

Main Index


This project is a collaboration of
the Center for Aquatic and Invasive Plants, University of Florida, and
the Bureau of Invasive Plant Management, Florida Department of Environmental Protection


varamey@nersp.nerdc.ufl.edu
Copyright 2004 University of Florida