Streaky-breasted Spiderhunter Arachnothera affinis


Taxonomic note
Arachnothera affinis and A. modesta (del Hoyo and Collar 2016) were previously lumped as A. affinis following Sibley & Monroe (1990, 1993). A. everetti was previously split following Sibley & Monroe (1990, 1993) but is now lumped with A. affinis (del Hoyo and Collar 2016)

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Least Concern
Species attributes

Migratory status not a migrant Forest dependency medium
Land-mass type Average mass 24 g

Estimate Data quality
Extent of Occurrence (breeding/resident) 1,520,000 km2
Severely fragmented? no -
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing - suspected -
Generation length 4.2 years - - -

Population justification: The global population size has not been quantified. The species is described as uncommon on Borneo, but commoner on Java and Bali (del Hoyo et al. 2008).

Trend justification: The population is suspected to be in decline owing to ongoing habitat destruction.

Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Brunei extant native yes
Indonesia extant native yes
Malaysia extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Malaysia Crocker Range
Malaysia Danum Valley Conservation Area
Malaysia Kelabit Highlands
Malaysia Maliau Basin Conservation Area
Malaysia Mount Kinabalu
Malaysia Tabin Wildlife Reserve
Malaysia Tawau Hills Park
Malaysia Trus Madi Range
Malaysia Kabili-Sepilok

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane major resident
Altitude 900 - 1600 m Occasional altitudinal limits (min) 305 m

Recommended citation
BirdLife International (2024) Species factsheet: Arachnothera affinis. Downloaded from on 22/02/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from on 22/02/2024.