CR

Caecogobius cryptophthalmus

Unknown

Overview

Caecogobius cryptophthalmus is a species of goby that is endemic to underground habitats in Calbiga on the Philippine island of Samar. This species is one of two members of the genus Caecogobius. Like other cavefish, C. cryptophthalmus has reduced eyes and pigmentation.

Caecogobius cryptophthalmus faces severe threats from groundwater extraction and pollution in its highly restricted cave habitat in the Dinaric Alps. The species' extremely limited distribution makes it exceptionally vulnerable to any disturbance of the underground aquifer systems it depends upon. Agricultural runoff and industrial contamination pose additional risks to water quality in the karst landscape above its subterranean environment.

Threat summary

Habitat

This highly specialized goby inhabits underground cave systems and subterranean waters in the Dinaric karst region of southeastern Europe. The species is adapted to the perpetually dark, stable temperature conditions of deep groundwater environments within limestone cave networks.

Wetlands (inland)· majorCaves and subterranean habitats· major

Conservation measures underway

Site/area protectionSite/area managementSpecies recoveryCompliance and enforcement

Other threatened species in GOBIIDAE

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EN

Rhinogobius lineatus

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EN

Lipstick Goby

Sicyopus jonklaasi

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Threatened in Philippines

Acropora hemprichiiEN

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EN

Montipora calcarea

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VU

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Montipora taiwanensis

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Frequently asked questions

Why is Caecogobius cryptophthalmus classified as Critically Endangered?
Caecogobius cryptophthalmus is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Caecogobius cryptophthalmus faces severe threats from groundwater extraction and pollution in its highly restricted cave habitat in the Dinaric Alps. The species' extremely limited distribution makes it exceptionally vulnerable to any disturbance of the underground aquifer systems it depends upon. Agricultural runoff and industrial contamination pose additional risks to water quality in the karst landscape above its subterranean environment.
Where does Caecogobius cryptophthalmus live?
Caecogobius cryptophthalmus occurs in Philippines. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Caecogobius cryptophthalmus?
The main threats to Caecogobius cryptophthalmus are 6.1, ai-1, ai-2, and ai-3. The full IUCN-classified threat record for this species is detailed on the species page.

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