Leiobunum blackwalli

Leiobunum blackwalli, a harvestman, is a fascinating species within the arachnid family. Unlike spiders, harvestmen, including Leiobunum blackwalli, have a single, oval body segment, which differentiates them from the segmented bodies of spiders. This species is named after John Blackwall, a 19th-century naturalist who made significant contributions to arachnology.

Leiobunum blackwalli is primarily found in Europe, with a notable presence in Ireland and the UK. It thrives in a variety of habitats, including woodlands, grasslands, and gardens. This adaptability to different environments has aided its widespread distribution.

One of the most striking features of Leiobunum blackwalli is its long, slender legs, which are much longer in proportion to its body. These legs are not just for mobility; they also serve as sensory organs. Harvestmen have poor vision, so they rely heavily on their legs to detect vibrations and chemical signals in their environment.

In terms of diet, Leiobunum blackwalli is omnivorous. It has been seen feeding on small insects, plant material, other harvestmen and even decaying organic matter. This diet makes it an important part of the ecosystem, contributing to the decomposition process and nutrient cycling.

Harvestmen, including Leiobunum blackwalli, are often mistaken for spiders, but they are harmless to humans. They do not possess venom glands or fangs, and their chelicerae (mouthparts), which remind me very much of crab claws, are adapted for grasping and chewing rather than biting.

Most of the specimens I have caught of this species have been swept or beaten from low-hanging tree branches or larger bushes (gorse, hedgerows).