Diahogna martensi is a species of Australian wolf spider belonging to the family Lycosidae. It is typically associated with moist environments such as grasslands, wetlands, creek lines, and damp forest margins, where it shelters among low vegetation, leaf litter, or within shallow retreats close to water.
This species is considered semi-aquatic in its habits compared to many other wolf spiders, often being found in close proximity to water sources and showing a strong preference for humid or saturated habitats. It is a fast, ground-dwelling active hunter that does not construct webs to capture prey, instead relying on vibration detection, excellent vision, and rapid movement to locate and ambush small invertebrates.
It is generally recognised by its slender build, long legs, and muted brown to grey colouration, which provides effective camouflage in wet soil and vegetated ground cover. It is primarily nocturnal, becoming most active at night when it hunts across the ground surface and along the edges of damp habitats.
Adults typically reach a body length of around 15–25 mm, with females being larger and more robust than males. Its preference for humid environments, active hunting behaviour, and interesting natural instincts make it a highly engaging species for observation in captivity.