Family Tetrakas (Bernieridae)


Dusky Tetraka (Crossleyia tenebrosa)


French: Fouditany obscur German: Sianakamadagaskarsänger Spanish: Tetraka oscuro

Bernieria tenebrosa


, 1925,

Sianaka Forest, central eastern Madagascar


Previously placed in Xanthomixis, where, on basis of similarities in plumage pattern, was thought to be most closely related to X. zosterops. However, genetic analysis indicates that this species is actually sister to C. xanthophrys#R. Monotypic.


NE Madagascar, from at least Marojejy S to Zahamena. Few reliable records since 1930. Reports from Masoala Peninsula, Analamazaotra and Ranomafana National Park require confirmation#R.

Descriptive notes

14–15 cm; one unsexed 21·4 g. Small species, dark with yellow throat, robust legs, fairly short bill with lower mandible slightly inflated centrally and appearing... read more


A series of quiet, high-pitched hissing and twittering calls, similar to those of other members of... read more


Primary lowland and evergreen forest, up to 950 m.

Food and feeding

Arthropods. Occurs in small groups; sometimes in mixed-species flocks. Largely terrestrial, foraging in areas of often sparse understorey... read more


No information.


No information; presumed sedentary.

Status and conservation

VULNERABLE. Restricted-range species: present in East Malagasy Wet Forests EBA. Global population estimated to number fewer than 10,000 individuals. Clearly rare and local,... read more

Recommended citation

Fishpool, L. & Tobias, J. (2019). Dusky Tetraka (Crossleyia tenebrosa). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 20 March 2019).