Rilaena triangularis

Rilaena triangularis is a species of the harvestman family Phalangiidae. It is sometimes considered to be in the genus Paraplatybunus, in the subfamily Platybuninae.

Description
Rilaena triangularis is a harvestman that lives across Europe. This species was first described by Johann Friedrich Wilhelm Herbst in 1799, initially as Phalangium triangularis. It was later renamed through recombination.

Chemical defense
When disturbed, Rilaena triangularis emits a strong-smelling secretion as a chemical defense. This fluid contains 1,4-benzoquinone, 1,4-naphthoquinone and caprylic acid.

Range
Occurrences of Rilaena triangularis have been recorded and aggregated in GBIF across Europe, with the exception of Spain and Portugal. It has also been observed in north-west and north-east corners of the United States.

Habitat
The species thrives in forests, floodplain forests and fens.