Melasis fermini is a rare species of soldier beetles native to a small area of Spain.

[1] It has only been found in three locations in Guadalajara, Caceres, and Ciudad Real, and its estimated range is less than twelve square kilometers.

[2] The species was named in honor of the late Fermín Martín Piera, a Spanish biologist and taxonomist who specialized in the study of dung beetles.

[3]: 1 Melasis fermini is most closely related in morphology to M. buprestoides, but can be told apart by a few key differences.

[3]: 4 In general, the species lives on dead wood of deciduous trees which have been decomposing for several years in areas of high humidity and protection from the elements (especially direct sunlight).

The type specimen of the species was collected inside a beech trunk on the ground in an area with moist and shady soil, such that the wood was extremely decomposed.

M. fermini has also been collected from the bottom of a standing alder trunk which had been dead for roughly two years.

Specifically, it is threatened by the continued logging of its habitat and forest management techniques that remove the dead wood on which they live.