Fluviopupa gracilis is separated from F. ramsayi in having an elongate-pupoid shell and the distal end of the penis is longer (not shorter) than the accessory lobe. This subspecies is the largest of the F. gracilis complex and has 5 whorls. As in F. gracilis erskinensis the mantle is black and the head-foot has some pigmentation.
Fluviopupa gracilis kingstoni Ponder, 1982
Class Gastropoda
Infraclass Caenogastropoda
Order Littorinida
Suborder Rissoidina
Superfamily Truncatelloidea
Family Tateidae
Genus Fluviopupa Pilsbry, 1911
Original name: Fluviopupa gracilis kingstoni Ponder, 1982. In Ponder, W.F. (1982) Hydrobiidae of Lord Howe Island (Mollusca: Gastropoda: Prosobranchia). Australian Journal of Marine and Freshwater Research 33: 89-159.
Type locality: Southern end of Big Slope, Lord Howe Island, in creek on southern side of main point on slope.
In small streams on stones.
Southern end of Big Slope on eastern side of Mt. Gower, Lord Howe Island.
The Lord Howe Island Fluviopupa species are rather similar in appearance but the different taxa are in distinct geographical locations on Lord Howe Island.
Ponder, W. F. (1982). Hydrobiidae of Lord Howe Island (Mollusca: Gastropoda: Prosobranchia). Australian Journal of Marine and Freshwater Research 33: 89-159.
