Austrothelphusa tigrina

Austrothelphusa tigrina is a freshwater crab belonging to the family Gecarcinucidae, a group of true freshwater crabs distributed across the Indo-Pacific region. Like other members of its genus, it possesses a hardened carapace, robust chelae used for foraging and defense, and gills adapted for extracting oxygen from water, though many gecarcinucids can tolerate periods out of water. These crabs are typically omnivorous, feeding on organic matter, detritus, and small invertebrates, and they play a role in nutrient cycling and the breakdown of plant material within freshwater ecosystems.

Some species in this genus are known to burrow, providing microhabitats for other organisms.

The species is found in Australia, occupying permanent and seasonal rivers and streams as well as broader inland wetland systems. Its occasional association with marine neritic zones suggests some tolerance for or proximity to estuarine or coastal-influenced waters, though its core habitat remains freshwater.

Austrothelphusa tigrina is classified as Vulnerable, with an unknown population trend, meaning no reliable data currently indicates whether numbers are stable, increasing, or declining. Two ongoing threats have been identified: mining and quarrying activity, which can degrade or destroy stream and wetland habitats through sedimentation, pollution, and physical disturbance, and invasive non-native species, which may compete with or prey upon native crab populations and alter habitat conditions.

No specific conservation programs targeting this species have been documented. Its Vulnerable status reflects habitat sensitivity to industrial disturbance and biological invasion rather than confirmed population collapse. Without population monitoring data, its long-term trajectory remains uncertain, underscoring the need for further field surveys and habitat protection measures in affected river systems.