Introduction
A large family of true freshwater crabs comprising over 80 genera and more than 460 species (extant taxa) with a wide distribution from India and Sri Lanka to China, Taiwan, the Philippines, New Guinea, the Solomon Islands and Australia. Like other true freshwater crabs, the Gecarcinucidae have direct development with the hatchlings resembling miniature adults. — John W. Short, 2026
Diagnosis
Carapace usually broader than long, smooth or rugose; frontal region with a distinct or indistinct median triangle; anterolateral margin convex, armed with 1–3 epibranchial teeth (a single tooth in most genera). Mandibular palp with two lobes. Male abdomen t-shaped, less obviously in Australian species. Genital openings sternal in females, coxal in males. — John W. Short, 2026
