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{{short description|Article about turtles}}
==Turtle==
{{Use dmy dates|date=October 2023}}


'''Turtles''' are reptiles of the order [[Testudines]], characterized by a bony or cartilaginous shell that acts as a shield. The order includes both extant and extinct species, with the earliest known turtles dating back to the [[Triassic]] period, around 220 million years ago. Turtles are ectothermic, or cold-blooded, and are found in a variety of environments, from terrestrial to freshwater and marine habitats.
[[File:Turtle_golfina_escobilla_Oaxaca_Mexico_Claudio_Giovenzana_2010.jpg|A turtle on the beach in Oaxaca, Mexico|thumb|right]]


==Anatomy and Physiology==
Turtles are reptiles of the order [[Testudines]], characterized by a bony or cartilaginous shell that acts as a shield. The shell is developed from their ribs and acts as a protective barrier. Turtles are ectothermic, meaning they rely on external sources to regulate their body temperature. They are found in a variety of environments, from terrestrial to aquatic habitats.
Turtles have a unique body plan that includes a shell composed of a carapace (dorsal part) and a plastron (ventral part). The shell is made up of bony plates covered by scutes, which are keratinous scales. Unlike other reptiles, turtles cannot expand their chest to breathe; instead, they use special muscles to move their internal organs and create negative pressure to inhale.


===Shell===
==Anatomy==
The turtle shell is a complex structure that provides protection and support. It is formed by the fusion of ribs and vertebrae, which are covered by scutes. The shell's shape and size vary among species, adapted to their specific environments and lifestyles.


===Respiration===
[[File:Turtle_skeleton_cross-section,_labelled_as_infographic.svg|Cross-section of a turtle skeleton|thumb|left]]
Turtles have adapted various methods of respiration. While most breathe air through lungs, some species can absorb oxygen through their skin or cloaca, especially when submerged in water for extended periods.


==Ecology and Behavior==
Turtles have a unique skeletal structure. Their shell is divided into two parts: the carapace (upper shell) and the plastron (lower shell). The carapace is fused with the vertebrae and ribs, providing a sturdy protective layer. The plastron is connected to the carapace by bony structures called bridges. Turtles lack teeth but have beaks that are adapted to their diet.
Turtles occupy diverse ecological niches. Some are strictly aquatic, like the [[Green sea turtle]], while others, such as the [[Box turtle]], are primarily terrestrial. Turtles are generally omnivorous, with diets ranging from plants and algae to invertebrates and small vertebrates.


===Reproduction===
==Evolution and Classification==
Turtles lay eggs, which they bury in sand or soil. The temperature of the nest can determine the sex of the hatchlings, a phenomenon known as temperature-dependent sex determination. After laying eggs, most female turtles do not provide parental care.


===Migration===
Turtles are one of the oldest reptile groups, with a history dating back over 200 million years. They belong to the order Testudines, which is divided into two suborders: Cryptodira and Pleurodira. Cryptodira includes most of the world's turtle species, while Pleurodira, or side-necked turtles, are primarily found in the Southern Hemisphere.
Many turtle species, particularly sea turtles, undertake long migrations between feeding and nesting grounds. These migrations can span thousands of kilometers and are guided by environmental cues such as ocean currents and the Earth's magnetic field.
 
==Habitat and Distribution==
 
[[File:Green_Sea_Turtle_swimming.jpg|A green sea turtle swimming|thumb|right]]
 
Turtles inhabit a wide range of environments, including oceans, rivers, lakes, and forests. Sea turtles, such as the green sea turtle, are adapted to life in the ocean, while freshwater turtles, like the red-eared slider, are commonly found in ponds and rivers. Terrestrial turtles, such as the box turtle, prefer forested areas.
 
==Diet==
 
Turtles have varied diets depending on their species and habitat. Some are herbivores, feeding on grasses, leaves, and fruits, while others are carnivores, preying on insects, fish, and small animals. Many turtles are omnivores, consuming both plant and animal matter.
 
==Reproduction==
 
Turtles lay eggs, which they bury in sand or soil. The temperature of the nest can determine the sex of the hatchlings, a phenomenon known as temperature-dependent sex determination. After laying eggs, female turtles return to their habitat, leaving the eggs to incubate and hatch on their own.


==Conservation==
==Conservation==
Turtles face numerous threats, including habitat destruction, pollution, climate change, and poaching for their meat and shells. Conservation efforts focus on habitat protection, legal protection, and captive breeding programs to ensure the survival of endangered species.
 
[[File:Indian_softshell_turtle_(Nilssonia_gangetica)_Babai_River_nose-breathing_at_surface.jpg|An Indian softshell turtle breathing at the surface|thumb|left]]
 
Many turtle species are threatened by habitat destruction, pollution, and poaching. Conservation efforts are crucial to protect these ancient reptiles. Organizations work to preserve turtle habitats, regulate hunting, and raise awareness about the importance of turtles in ecosystems.


==Cultural Significance==
==Cultural Significance==
Turtles have been featured in various cultural myths and legends. In some cultures, they symbolize longevity and wisdom. The [[Kurma]] avatar of the Hindu god [[Vishnu]] is depicted as a turtle, representing stability and support.


==Related pages==
Turtles have been significant in various cultures and mythologies. They are often seen as symbols of longevity, stability, and wisdom. In some cultures, turtles are revered and protected, while in others, they are hunted for their meat and shells.
 
==Related Pages==
* [[Sea turtle]]
* [[Box turtle]]
* [[Red-eared slider]]
* [[Tortoise]]
* [[Tortoise]]
* [[Sea turtle]]
* [[Reptile]]
==References==
{{Reflist}}
==Gallery==
<gallery>
Turtle_golfina_escobilla_Oaxaca_Mexico_Claudio_Giovenzana_2010.jpg|Olive Ridley Sea Turtle
Florida_Box_Turtle_Digon3.jpg|Florida Box Turtle
Turtle_skeleton_cross-section,_labelled_as_infographic.svg|Turtle Skeleton Cross-section
How_the_Turtle_Gets_its_Shell.svg|Turtle Shell Development
Green_Sea_Turtle_swimming.jpg|Green Sea Turtle
Red_Eared_Slider's_Eye.jpg|Red Eared Slider
Indian_softshell_turtle_(Nilssonia_gangetica)_Babai_River_nose-breathing_at_surface.jpg|Indian Softshell Turtle
Snapping_turtle_in_Mud.JPG|Snapping Turtle
Two_basking_cooter_turtles_(5861462496).jpg|Basking Cooter Turtles
Green_Sea_Turtle_grazing_seagrass.jpg|Green Sea Turtle Grazing
Chelodina_oblonga_1.jpeg|Oblong Turtle
Crested_Caracara_eating_a_turtle_(16753759877).jpg|Crested Caracara Eating a Turtle
Tortoise_Snap_(2_frames).jpg|Tortoise Snap
Three-toed_Box_Turtle_(47930139991).jpg|Three-toed Box Turtle
Snapping_turtle_4_md.jpg|Snapping Turtle
Tortoise-Hatchling.jpg|Tortoise Hatchling
Origin_of_Turtle_Body_Plan.jpg|Origin of Turtle Body Plan
Haeckel_Chelonia.jpg|Haeckel's Chelonia
Zoology_of_Egypt_(1898)_(Varanus_exanthematicus).png|Zoology of Egypt
Psammobates_geometricus_1872_white_background.jpg|Geometric Tortoise
Deinosuchus_riograndensis.png|Deinosuchus
Spot-billed_pelican_takeoff_white_background.jpg|Spot-billed Pelican
Pig-nosed_turtle_(Carettochelys_insculpta)_(cropped).jpg|Pig-nosed Turtle
</gallery>


[[Category:Turtles]]
[[Category:Turtles]]
[[Category:Reptiles]]

Latest revision as of 11:21, 23 March 2025

Turtle[edit]

A turtle on the beach in Oaxaca, Mexico

Turtles are reptiles of the order Testudines, characterized by a bony or cartilaginous shell that acts as a shield. The shell is developed from their ribs and acts as a protective barrier. Turtles are ectothermic, meaning they rely on external sources to regulate their body temperature. They are found in a variety of environments, from terrestrial to aquatic habitats.

Anatomy[edit]

Cross-section of a turtle skeleton

Turtles have a unique skeletal structure. Their shell is divided into two parts: the carapace (upper shell) and the plastron (lower shell). The carapace is fused with the vertebrae and ribs, providing a sturdy protective layer. The plastron is connected to the carapace by bony structures called bridges. Turtles lack teeth but have beaks that are adapted to their diet.

Evolution and Classification[edit]

Turtles are one of the oldest reptile groups, with a history dating back over 200 million years. They belong to the order Testudines, which is divided into two suborders: Cryptodira and Pleurodira. Cryptodira includes most of the world's turtle species, while Pleurodira, or side-necked turtles, are primarily found in the Southern Hemisphere.

Habitat and Distribution[edit]

A green sea turtle swimming

Turtles inhabit a wide range of environments, including oceans, rivers, lakes, and forests. Sea turtles, such as the green sea turtle, are adapted to life in the ocean, while freshwater turtles, like the red-eared slider, are commonly found in ponds and rivers. Terrestrial turtles, such as the box turtle, prefer forested areas.

Diet[edit]

Turtles have varied diets depending on their species and habitat. Some are herbivores, feeding on grasses, leaves, and fruits, while others are carnivores, preying on insects, fish, and small animals. Many turtles are omnivores, consuming both plant and animal matter.

Reproduction[edit]

Turtles lay eggs, which they bury in sand or soil. The temperature of the nest can determine the sex of the hatchlings, a phenomenon known as temperature-dependent sex determination. After laying eggs, female turtles return to their habitat, leaving the eggs to incubate and hatch on their own.

Conservation[edit]

An Indian softshell turtle breathing at the surface

Many turtle species are threatened by habitat destruction, pollution, and poaching. Conservation efforts are crucial to protect these ancient reptiles. Organizations work to preserve turtle habitats, regulate hunting, and raise awareness about the importance of turtles in ecosystems.

Cultural Significance[edit]

Turtles have been significant in various cultures and mythologies. They are often seen as symbols of longevity, stability, and wisdom. In some cultures, turtles are revered and protected, while in others, they are hunted for their meat and shells.

Related Pages[edit]