T. inflata is found in the same geographical locations as T. minuta, in shallow waters of the lower part of the mound springs outflow.[4] The name inflata was derived from the characteristic of the species' inflated shell.[4] This species is found in the Freeling Springs complex in the northern part of Lake Eyre supergroup. T. inflata has a small but wide umbilicus and a relatively larger spire as compared to other species. The average adult size can reach ~1.5 – 1.7mm in diameter.[4]
T. minuta is the smallest species of Trochidrobia, hence its species name. This species is found alongside T. inflata in Freeling Springs and has a wide hole at the centre of the shell and a shorter and flatter spire. The average diameter of adults for this species is about 1.2mm and individuals are yellowish white to a pale brown.[4] The head and foot are pigmented heavily.[4]
T. punicea is found in the southern and middle part of the Artesian springs system. The species is usually found completely exposed above the water's surface.[4] T. punicea has a short spire and an open centre of the shell. The name punicea is derived from purple-red in Latin, which is a reference to the shell of this species. Its diameter reaches a maximum of 2.2mm and the operculum is oval-shaped.[4] The head and foot of this genus usually has dark pigmentation. This is the only species of Trochidrobia appears to be attracted to light.[4]
T. smithi is found in the Middle Springs, Southern-Western Springs and the Northern Springs in the Artesian Springs system. The species has a shell with a short spire and an open umbilicus that reaches a maximum diameter of 2.1mm.[4] The average adult size for this genus species is between 1.7mm to 2.1mm. The head and foot are similar to T. punicea as the species has uniform dark pigmentation.[4]
