Venom effects and medical significance are different from toxicity rankings. Do not handle a snake on the basis of this summary.
Shelters under rocks in dry streambeds and forest ravines, including selectively logged forest. Its atlas account links 2 named island or island-group records to the source literature.
OccurrenceConfirmed
Islands named2
Natural history5 sourced topics
References4
Literature updated 2026-10-07 · Editorial review pending
Belly colour alone does not identify this species.
Reproduction
Reproductively mature males occur. An adult male collected in the Angat watershed in December 2010 measured 302 mm in total length, resolving earlier speculation that only females existed.
This record does not establish clutch size, breeding season or whether facultative parthenogenesis occurs.
Philippine distribution
The atlas records Hologerrhum philippinum from these named Philippine areas: Luzon, Polillo. These are literature areas rather than a continuous range boundary.
Literature documented · Existing checklist occurrence statement and distribution review
The original evidence level is retained.
A country listing cannot establish an island or a precise locality.
Taxonomic context
Hologerrhum philippinum is retained in the atlas’s dated checklist under Cyclocoridae. The authority is GÜNTHER 1858. Earlier names and the original source notes are preserved below for comparison.
Literature documented · Checklist identity and nomenclatural trail
Checklist verified 2026-09-05; not a newly revised taxonomic backbone.
Historical names can cover different biological concepts; synonyms should not be used to transfer records automatically.
Across the archipelago
Where this species is recorded
PhilippinesN ↑
Documented islands: gold · island groups: dashed circles
Island-level records · not continuous habitat coverage. Dashed circles locate groups, not individual observations.
Philippine distribution
Documented places
2 named islands / island groups
Select an island to read its distribution record and sources. Uncoloured islands are not evidence of absence.
Distribution record & sources
Philippines (Luzon, Polillo)
Type locality: Philippines
The atlas records Hologerrhum philippinum from these named Philippine areas: Luzon, Polillo. These are literature areas rather than a continuous range boundary.
Venom classification not yet added · Effects not yet summarised in this atlas
Observe from a distance. Do not handle, corner or capture a snake to identify it. An incomplete venom account is not evidence that a species is safe to handle.
After a suspected snakebite, keep the person still and arrange urgent medical care. Avoid tight tourniquets, cutting, suction and unproven remedies. Do not wait to identify the snake before seeking help.
2018 Philippine synopsis treatment plus current RDB listing
Islands named
Luzon, Polillo
Range noteCountry/island text is not a range polygon or locality record.
Source distribution statement
Philippines (Luzon, Polillo)
Type locality: Philippines
Knowledge coverage
EndemismResearch pending
EcologyLiterature documented
VenomVenom classification not yet added Effects not yet summarised in this atlasDetailed research: Research pending
ConservationResearch pending
Names through time
Nomenclatural trail
Hologerrhum philippinum GÜNTHER 1858: 186
Cyclochorus maculatus JAN & SORDELLI 1870
Hologerrhum philippinum — GÜNTHER 1873
Cyclochorus lineatus var. maculatus FISCHER 1885: 81
Hologerrhum philippinum — BROWN et al. 2001
Hologerrhum philippinum — MCLEOD et al. 2011
Hologerrhum philippinum — WALLACH et al. 2014: 334
Hologerrhum philippinum — WEINELL et al. 2020
Taxonomic and source notes
Synonymy: after Brown et al. 2001
The specimen illustrated in JAN & SORDELLI is actually Hologerrhum philippinum with doubtful locality data.
Type species: Hologerrhum philippinum GÜNTHER 1858: 186 is the type species of the genus Hologerrhum GÜNTHER 1858.
References attached to this record
2026
The Reptile Database — species checklist, 17 June 2026
The amphibians and reptiles of Luzon Island, Philippines, VIII: the herpetofauna of Cagayan and Isabela Provinces, northern Sierra Madre Mountain Range
Brown, R. M.; Siler, C. D.; Oliveros, C. H.; Welton, L. J.; Rock, A.; Swab, J.; Van Weerd, M.; Van Beijnen, J.; Jose, E.; Rodriguez, D.; Jose, E.; Diesmos, A. C.