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Boulengerula niedeni
The Sagalla caecilian (''Boulengerula niedeni'') 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 know from other areas.
Little of 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 listed as critically endangered on the IUCN Red List of Threatened Species.〔 It has been listed as one of the top-10 "focal species" in 2008 by the Evolutionarily Distinct and Globally Endangered (EDGE) project.
==Description==
The Sagalla caecilian belongs to a highly unusual group of amphibians characterized by an elongated, limbless, externally segmented body, closely resembling that of a large earthworm. Depending on the micro-habitat the amphibian is found its color may vary. When found in areas with shade and high altitude they tend to be a dark brown while when found in lower elevations they tend to be a light brown with some traces of blue. Meanwhile, the bodies of juveniles only have a long, dark, narrow band on its back, and otherwise are not pigmented.〔(【引用サイトリンク】url=http://www.edgeofexistence.org/amphibians/species_info.php?id=548&search=focal )〕
Unlike earthworms, caecilians possess a prominent mouth, nostrils, and, uniquely amongst vertebrates, a pair of retractable tentacles, one on each side of the head, between the eye and nostril. The snout of the Sagalla caecilian is rounded, with short, globular tentacles, and a relatively large mouth, with two rows of teeth in each jaw. The eyes in some are highly reduced, and, sometimes, almost entirely covered by bone and skin. The eyes may form like this due to the lack of need for vision, beyond sensing light, while digging.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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