Shinisaurus crocodilurus Ahl, 1930

Taxonomic Classification

The Chinese crocodile lizard, with the scientific name Shinisaurus crocodilurus Ahl, 1930, is a semiaquatic anguimorph lizard.

General Distribution

It is found only in cool forests across southeastern China and northeastern Vietnam.

Foraging Behavior and Diet

This species spends much of its time in shallow water, or on overhanging branches and vegetation, where it hunts prey including insects, snails, tadpoles, and worms. Captive individuals may be fed baby mice.

Conservation Status and Trade Regulation

It is a rare, little-studied lizard, and is listed in CITES Appendix II, which regulates international trade of its specimens.

Evolutionary History

This species is the only member of the monotypic genus Shinisaurus, and the only living member of the lizard clade Shinisauria, whose fossil record extends back to the Early Cretaceous over 120 million years ago.

Chinese Subpopulation Range

Surviving subpopulations of Chinese crocodile lizards primarily occupy isolated fragments of habitat in Guangxi and Guangdong provinces of southeastern China.

Vietnamese Subspecies Range

The recognized Vietnamese subspecies occurs only on Yên Tử Mountain in Quảng Ninh and Bac Giang provinces of northeastern Vietnam.

Habitat Preference

Chinese crocodile lizards live along clear streams within subtropical broadleaf evergreen forests. They habitually prefer remote streams in undisturbed areas such as mountain ridges and dense forests.

Climatic and Elevational Range

This species lives in a relatively cool, monsoonal climate at moderately high elevations, ranging from 200 to 1,500 meters (660 to 4,920 ft) above sea level.

Antipredator Strategy

Their preference for open, less densely vegetated habitat aligns with their antipredator strategy of fleeing instead of fighting.

Shelter Usage

They use tree holes, rocks, and vegetated perches for shelter, and are rarely found exposed on the forest floor.

Reproductive Maturity

On average, Chinese crocodile lizards reach full maturity and become able to reproduce by age 3.

Reproductive Traits

They are viviparous lizards, giving birth to 2 to 12 fully developed, independently viable offspring every spring, with no maternal care required after birth. Gestation lasts up to 9 months.

Breeding Frequency

Females are able to breed annually.

Breeding Season Timing

Courtship typically begins at the end of winter, and breeding most often occurs in summer, mainly in July and August.

Male Pre-Copulation Signaling

Pre-copulation behavior usually starts when adult males develop more vibrant coloration. Males perform courtship behaviors including head-nodding and approaching females.

Copulation Initiation

Successful copulation begins when the male approaches and bites the female on the neck.

Copulation Positioning

He then moves to position his body on top of the female, and secures his tail below hers. This position maintains alignment for cloacal contact between the pair.

Copulation Conclusion

After ejaculation, the male releases his bite on the female's neck and lets her go.