Boulengerula niedeni, the Sagalla caecilian, is a worm-like amphibian first described in 2005. The species was described from a specimen discovered on Sagala Hill, an isolated mountain block of the Taita Hills in Kenya, and is not known from other areas.

Little of the original forest remains on Sagalla Hill, but the species seems to adapt to human disturbance associated with small-scale farming activities; it is not found in the eucalyptus plantations that cover much of the hill. Because of the small range of this species, it is as of 2013 listed as endangered on the IUCN Red List of Threatened Species, while previously from 2006 been listed as critically endangered. It has been listed as one of the top-10 "focal species" in 2008 by the Evolutionarily Distinct and Globally Endangered (EDGE) project.

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