Two-spotted harvestman
Nemastoma lugubre
The two-spotted harvestman is a small arachnid with a compact, highly arched, and heavily sclerotized body. It is characterized by its deep black coloration and two distinct light, usually whitish or yellowish spots on the cephalothorax. Unlike many other harvestmen, it has relatively short legs in proportion to its body size. It prefers moist habitats such as forest leaf litter or moss cushions.
Details
Identification
Deep black, rounded body; two distinct white to silvery spots on the cephalothorax; short, dark legs; lacks the high ocular tubercle typical of other harvestman families.
Social behavior
Predominantly solitary, but can occur in high densities within leaf litter in suitable habitats.
Diet
Feeds predatorily on small invertebrates such as mites, springtails, and small insect larvae, as well as organic detritus and carrion.
Hunting strategy
Active searching and seizing of prey with the pedipalps in the humus layer.
Spawning substrate
Moist soil or moss beneath the litter layer.
Overwintering
Usually overwinters as an adult or in the egg stage within the protective leaf litter.
Ecology
Ecological role
Important predator in the decomposer chain of the forest floor; contributes to the control of micro-arthropod populations.
Natural predators
Birds, small mammals (e.g., shrews), ground beetles, and larger spiders.
Competitor species
Other ground-dwelling harvestmen and small spiders.
Ecosystem service
Regulation of soil organisms and contribution to the nutrient cycle through predation.
Threats
Habitat loss due to large-scale forest drainage and intensive forestry practices.
Scientific profile
Profile
Distinguishing features
Compact, highly arched body; the two light spots on the prosoma are the primary feature. Unlike related species such as Nemastoma dentigerum, it lacks spines on the free tergites of the abdomen. The cuticle is finely granulated.
Habitat
Prefers moist habitats such as deciduous and mixed forests, bogs, shaded gardens, and riparian areas. Frequently found in leaf litter and moss cushions.