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The Yellow Pygmy Goby, Lubricogobius exiguus, is a subtropical marine goby in the large subfamily Gobiinae, which is composed of 150 genera and 2000 species. This fish was described in 1915, the first species described in genus Lubricogobius. Three other species have been discovered since, all characterized as small fish having no scales and no sensory pores, but with sensory papillae on their heads. The Yellow Pygmy Goby is known from Japan, and also possibly from Taiwan and New Caledonia although these identifications have not been confirmed. It is a small bright yellow fish, < 4cm in length, that inhabits muddy sand substrates, hiding in rubble or debris at depths between 5-100 meters. Genus Lubricogobius is thought to be most closely related to the Indo-Pacific genus Gobiodon (Coral or Clown Gobies), which is comprised of about 15 species. The species in both genera secrete a thick skin mucus poisonous to other fish, although the toxicity of the mucous has not yet been specifically studied in Lubricogobius, only in several Gobiodon species.
(Chen and Fan 1997; Garilao 2011; Hashimoto et al. 1974; Prokofiev 2009; Randall and Senou 2001; Wikipedia 10 April 2013, 26 Feb 2013).