This form is known from not less than 13 associated skeletons which were recovered from cave deposits on the island of Terceira, one of the Azores Islands, Portugal, most of which, however, with fragmentary bones only.

The Terceira Rail was a member of the genus Rallus but has not yet being described. [1]

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There is a very exceptional specimen that can be assigned to this species that was found in Algar do Carvão, a chimney of a former volcano in the center of Terceina. This specimen is of an individual that was mummified by natural processes and is now preserved as a three-dimensional body still bearing soft body parts, skin and feathers “wrapped” in a silicified crust. [1]

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References:

[1] Josep Antoni Alcover; Harald Pieper; Fernando Pereira; Juan Carlos Rando: Five new extinct species of rails (Aves: Gruiformes: Rallidae) from the Macaronesian Islands (North Atlantic Ocean). Zootaxa 4057(2): 151-190. 2015

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edited: 10.09.2019