10 Animals Known Only From A Single Specimen

A glow-in-the-dark cockroach, an omen of death from Maori legend, and a parasitic wasp named after a controversial pop singer may not seem to have much in common, but they are among the species known to science only by their holotype. In other words, only a single specimen of these creatures is known to exist. Such animals are not as rare as might be expected—The Encyclopedia of Life lists 61 such species. Some of the animals are likely lost forever, though others may still exist. The list does not include hybrids bred in captivity such as the Indian/African Elephant hybrid.

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