biology

List of critically endangered reptiles

List of critically endangered reptiles is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand List of critically endangered reptiles rather than just read about it. In short: As of June 2026, the International Union for Conservation of Nature (IUCN) lists 432 critically endangered reptile species, including 50 which are tagged as possibly extinct. 4.2% of all evaluated reptile species are listed as critically endangered; 15 subspecies, and 11 subpopulations are also listed as critically endangered. Additionally, 1,502 reptile species (14.5% of those evaluated) are listed as data deficien…

Key takeaways

List of critically endangered reptiles belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect List of critically endangered reptiles to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of List of critically endangered reptiles from memory before moving on to harder problems.

Reference excerpt

As of June 2026, the International Union for Conservation of Nature (IUCN) lists 432 critically endangered reptile species, including 50 which are tagged as possibly extinct. 4.2% of all evaluated reptile species are listed as critically endangered; 15 subspecies, and 11 subpopulations are also listed as critically endangered. Additionally, 1,502 reptile species (14.5% of those evaluated) are listed as data deficient, meaning there is not sufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN. While the category of data deficient indicates that no assessment of extinction risk has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of attention as threatened taxa, at least until their status can be assessed". This is a complete list of critically endangered reptile species and subspecies evaluated by the IUCN. Species considered possibly extinct by the IUCN are marked as such. Species and subspecies which have critically endangered subpopulations (or stocks) are indicated.

Turtles and tortoises

Chelidae Austro‑South American side‑necked turtles

Pelomedusidae African side‑necked turtles

Seychelles yellow-bellied mud turtle (Pelusios castanoides ssp. intergularis) Seychelles black mud turtle (Pelusios subniger ssp. parietalis)

Podocnemididae Malagasy‑South American side‑necked turtles

Madagascar big-headed turtle (Erymnochelys madagascariensis) Magdalena River turtle (Podocnemis lewyana)

Trionychidae Softshell turtles

Emydidae Terrapins

Bog turtle (Glyptemys muhlenbergii)

Platysternidae Big‑headed turtle (single extant species)

Big-headed turtle (Platysternon megacephalum)

Geoemydidae Box turtles, pond turtles

Testudinidae Tortoises

Cheloniidae Sea turtles

Dermochelyidae Leatherback sea turtle (single extant species)

Leatherback sea turtle (Dermochelys coriacea) (VU) East Pacific Ocean subpopulation Southwest Atlantic Ocean subpopulation Southwest Indian Ocean subpopulation West Pacific Ocean subpopulation

Dermatemydidae Hickatee (single extant species)

Hickatee (Dermatemys mawii)

Kinosternidae Mud turtles, musk turtles

Crocodilia

Lizards

Diplodactylidae Diplodactylid geckos

Carphodactylidae Southern padless geckos

Eublepharidae Eublepharid geckos

Sphaerodactylidae Sphaerodactylid geckos

Phyllodactylidae Phyllodactylid geckos

Gekkonidae Common geckos

Scincidae Skinks

Alopoglossidae Alopoglossus lizards

Daniel's largescale lizard (Alopoglossus danieli)

Gymnophthalmidae Spectacled lizards

Teiidae Racerunners, tegus

Lacertidae Wall lizards

Amphisbaenidae Worm lizards

Varanidae Monitor lizards and allies

Mitchell's water monitor (Varanus mitchelli)

Diploglossidae Galliwasps and Ophiodes sp. legless lizards

Anguidae Slowworms, glass lizards, and alligator lizards.

Chamaeleonidae Chameleons

Agamidae Dragon lizards

Leiocephalidae Curly-tailed lizards

Iguanidae Iguanas and chuckwallas

Tropiduridae Neotropical ground lizards

Haensch's whorltail iguana (Stenocercus haenschi) (possibly extinct)

Phrynosomatidae Phrynosomatid lizards

Dactyloidae (Anolidae) Anoles

Liolaemidae Tree iguanas and allies

Leiosauridae Leiosaurid iguanians

Snakes

Leptotyphlopidae Thread snakes

Gerrhopilidae Indo-Malayan blind snakes

Typhlopidae Common blind snakes

Xenotyphlopidae Madagascar blind snakes

Tropidophiidae Dwarf boas

Boidae Boas

Uropeltidae Shield-tail snakes

Cylindrophiidae Asian pipesnakes

Viperidae Vipers

Colubridae Colubrids (including Natricinae, Dipsadinae, Calamariinae et al.)

Prosymnidae Shovel-snout snakes (formerly of Lamprophiidae)

Ornate shovel-snout (Prosymna ornatissima)

Pseudoxyrhophiidae Pseudoxyrhophiids (formerly of Lamprophiidae)

Elapidae Coral snakes, cobras, and allies

See also Lists of IUCN Red List critically endangered species List of least concern reptiles List of near threatened reptiles List of vulnerable reptiles List of endangered reptiles List of recently extinct reptiles List of data deficient reptiles

References

Illustrations

Worked examples

Example 1 — a first encounter with List of critically endangered reptiles

Start with the simplest possible case. Write down what List of critically endangered reptiles claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to List of critically endangered reptiles before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about List of critically endangered reptiles ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of List of critically endangered reptiles

In research: List of critically endangered reptiles appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses List of critically endangered reptiles in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: List of critically endangered reptiles is common in secondary-school and first-year university syllabi. It links to neighbouring topics IUCN Red List critically endangered species, Lists of animals by conservation status, Lists of reptiles, so understanding it makes those chapters shorter.
In everyday life: Look for List of critically endangered reptiles outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study List of critically endangered reptiles in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what List of critically endangered reptiles means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain List of critically endangered reptiles out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is List of critically endangered reptiles in simple terms?

Why does List of critically endangered reptiles matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study List of critically endangered reptiles?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on List of critically endangered reptiles.