Twelve years later, a second species was described by W. A. Cunnington, leader of the third Tanganyika Expedition, and was also placed in a separate genus, as Limnothelphusa maculata.

The same author later described a third species, Platythelphusa conculata, and eventually realised that all three belonged to the same genus, reducing Limnothelphusa to a taxonomic synonym.

[2] As the largest species in the genus (up to 6 cm or 2.4 in in carapace width), Platythelphusa armata is subject to small-scale fishery.

[11] Platythelphusa maculata lives on sand and rocks, and occasionally in Neothauma shells, at depths of 1–60 metres (3.3–196.9 ft), and is listed as Least Concern.

[12] Platythelphusa polita lives on sand and rocks, and occasionally in Neothauma shells, at depths of 5–60 metres (16–197 ft), and is listed as Least Concern.

[14] Platythelphusa tuberculata has longer legs than the other species, and lives at the northern end of Lake Tanganyika, on muddy substrates.