Anolis laevis Rediscovered in Peru After 150 Years

A lizard distinguished by a projecting nose has been rediscovered in Peru after being absent from scientific records for 150 years.

Its reappearance demands swift choices on safeguarding the remaining fragments of forest it inhabits, before logging, agriculture and road construction reduce them beyond repair.

Verifying the lost species

Survey teams encountered the lizard on a steep path through humid montane forest in Peru’s San Martín region.

Fernando Ayala-Varela, a biologist at Ecuador’s National Institute of Biodiversity (INABIO), verified that the mountain lizard rediscovered in Peru was Anolis laevis.

In their paper, Ayala-Varela and INABIO colleagues placed the rediscovery roughly 50 to 100 kilometres from the original locality.

Despite this confirmation, researchers recognise that the species’ very limited known distribution offers little protection from fast-moving forest clearance.

The nose that distinguishes it

The males’ proboscis, an extension of the nose emerging from the snout, makes the lizard difficult to confuse with another species.

Instead of lengthening the jaw, this structure rests at the end of the snout, altering the animal’s overall silhouette.

Its nasal form corresponded with illustrations from the 19th century and helped exclude similar nearby species.

As the appendage occurs only in males, the researchers had to find females to establish the species’ complete range of appearances.

Why the males are different

The search located adult females as well as two adult males; females had never previously been formally documented for this species.

This missing information was important, as sexual dimorphism – the marked physical differences between males and females – may cause a species to go unnoticed.

In the newly collected specimens, females had no nose appendage at all, although their other characteristics closely resembled those of males.

Both sexes also possessed a throat display, so the team then examined their colouration and scale arrangements.

Throat markings and displays

Under its chin, Anolis laevis can extend a dewlap – a throat flap used in signalling – during social interactions.

Muscles push this flap outwards, changing the signal visible to other lizards and enabling individuals to judge distance and intent rapidly.

Colour was significant because males and females displayed distinct tones, providing field teams with a further identification feature beyond the nasal appendage.

As they had only a small number of animals, dependable visual traits enabled the researchers to distinguish this species from its neighbours.

Similar traits, distinct lineages

Among these lizards, nose appendages have evolved in separate branches, suggesting convergent evolution – where comparable traits arise independently in different lineages.

If separate populations experience similar pressures or signals, natural selection may produce matching adaptations without a recent common ancestor.

“This trait parallels the condition seen in other species of Anolis with a proboscis and may represent evolutionary convergence of the appendage in different lineages,” wrote Ayala-Varela.

Yet evolution may recreate a useful feature while the forest sustaining it vanishes within a single generation.

Forest loss is accelerating

Roads and farms have broken northeastern Peru’s mountain forests into increasingly small fragments.

By reducing and separating tree cover, land clearance lowers shade and humidity and may leave small populations isolated on different ridges.

Agriculture first spreads through valleys before moving uphill, while every newly created edge can bring fires, logging and invasive plants.

For a lizard recorded from only a small area within one Peruvian region, this level of disruption can rapidly eliminate habitat.

Extinction risk for the lizard

When assessing extinction threats, conservation planners compare rare species using criteria set by the International Union for Conservation of Nature.

In this framework, Endangered denotes a very high risk of extinction and indicates serious danger in the wild if threats persist.

The assessment considers range extent, population changes and habitat condition, meaning limited distributions can quickly trigger concern.

For Anolis laevis, the narrow area of rediscovery and ongoing land clearance make further surveys and protective action particularly urgent.

Protecting Anolis laevis

Conservation of this lizard must begin by locating additional individuals, as undiscovered populations may persist in surrounding valleys.

Thorough surveys could identify the species’ distribution, and these maps could inform protected-area limits and patrol routes.

Co-operation with local farmers is essential, because modest adjustments to clearance practices and pesticide use can preserve cooler, more humid forest edges.

Unless the remaining montane forest receives lasting protection, this rediscovery may become only a short footnote in conservation history.

The importance of new records

Rediscoveries such as this show scientists that an absence from museum collections may indicate limited search effort rather than genuine disappearance.

Additional field records also refine species descriptions, helping rangers and local communities identify the wildlife present on their land.

New information can shape land-use choices, as planners may regard unknown species as low risk when distribution maps contain no records.

For Anolis laevis, being observed again created an opportunity for it to be counted, researched and protected while time remains.

What happens next

One rediscovery has connected an unusual nose, clear differences between males and females, and a diminishing forest in an urgent conservation narrative.

Future searches and locally led forest protection will determine whether this lizard remains a living species or fades back into legend.