axolotl vs Cigar shark

Ambystoma mexicanum compared with Isistius brasiliensis

Key Differences

• axolotl is Critically Endangered while Cigar shark is Least Concern.

Taxonomic Classification

Rank	axolotl	Cigar shark
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Amphibia (Amphibians)	Elasmobranchii
Order	Caudata (Caudata)	Squaliformes (Squaliformes)
Family	Ambystomatidae	Dalatiidae
Genus	Ambystoma	Isistius
Species	Ambystoma mexicanum	Isistius brasiliensis

Evolutionary Relationship

axolotl and Cigar shark share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

axolotl

CR — Critically Endangered

Cigar shark

LC — Least Concern

Physical Characteristics

Attribute	axolotl	Cigar shark
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

axolotl

Habitat

Found across multiple habitat types including tropical and subtropical coniferous forests, tropical and subtropical grasslands and savannas, and Mediterranean forests and woodlands, among 10 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Colombia, Ecuador, Germany, Mexico, and Peru. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Cigar shark

Habitat

Native to Asia and Europe and South America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Chile, Norway, and Taiwan.

axolotl

The Axolotl (Ambystoma mexicanum) is a species in the genus Ambystoma. It is currently classified as Critically Endangered on the IUCN Red List. Found across multiple habitat types including tropical and subtropical coniferous forests, tropical and subtropical grasslands and savannas, and Mediterranean forests and woodlands, among 10 distinct biome types. Populations are also found.

Cigar shark

The cigar shark, also known as the cookiecutter shark (Isistius brasiliensis), is a small but remarkable shark in the family Dalatiidae, found throughout warm oceanic waters worldwide in tropical and subtropical latitudes. Reaching only 40–50 centimeters in length, it possesses oversized jaws with large, triangular lower teeth arranged in a saw-like series that cut distinctive circular plugs of flesh from much larger prey—including tuna, dolphins, whales, billfish, and even submarine cables and human bodies. It does not kill its prey but instead latches on, rotates its body, and excises a characteristic cookie-cutter-shaped bite. The cigar shark is bioluminescent, emitting a green glow from photophores on its ventral surface that may serve as counter-illumination or to attract prey from below. It undertakes diel vertical migrations, ascending to shallower waters at night and descending to mesopelagic depths during the day. The species is classified as Least Concern by the IUCN, with a vast oceanic distribution and no targeted commercial fishery. It is occasionally taken as bycatch. The geographic epithet brasiliensis refers to Brazil, where early specimens were described, but the species' range is circumglobal in warm oceans. The cookiecutter shark's feeding strategy is one of the most unusual among elasmobranchs.