Spiders are a various order of predatory arachnids with greater than 53.000 described species, most of which have eight eyes. Many webless searching spiders, most noticeably the leaping spiders (Salticidae) have been proven to have wonderful eyes with excessive spatial decision and color imaginative and prescient. The household of crab spiders (Thomisidae) can be hypothesized to be visible hunters, using a “sit and wait” or ambush searching approach; nonetheless, little is at present identified about their visible capability. Right here we use extracellular electrophysiology to look at the photoreceptor physiology of two crab spiders dwelling in two completely different ecological niches. Ozyptila praticola (C.L. Koch, 1837) hunts on the bottom in dim habitats whereas Xysticus cristatus (Clerck, 1757) hunts within the typical vibrant open grasslands. We check the hypotheses that (1) every species has special-purpose eyes, (2) that men and women have completely different photoreceptor physiology based mostly on noticed variations in conduct, and (3) the area of interest distinction of the 2 species is mirrored in several visible properties. We discovered assist for the primary speculation and in addition some assist for variations between the 2 species, principally within the temporal decision of the eyes. We discovered no proof of variations between men and women, indicating that the 2 sexes exhibit extra shared visually guided behaviors than beforehand thought.
Fischer, F.L., Scharff, N. & Garm, A. Photoreceptor physiology of two species of crab spiders (Araneae: Thomisidae). J Comp Physiol A (2026). https://doi.org/10.1007/s00359-026-01802-8
