Largetooth Flounder, Pseudorhombus arsius (Hamilton 1822)

Other Names: Large-tooth Flounder, Large-toothed Flounder

A Largetooth Flounder, Pseudorhombus arsius, at Clifton Gardens, Sydney Harbour, New South Wales, August 2015. Source: John Turnbull / Flickr. License: CC by Attribution-NonCommercial-ShareAlike

A greenish or brownish left-eyed flounder with a large dark blotch at front of the straight part of the lateral line and a second midway to the tail, often with large dark spots or rings that are sometimes encircled with small whitish spots, and small dark brown spots on the fins.

Cite this page as:
Bray, D.J. 2020, Pseudorhombus arsius in Fishes of Australia, accessed 21 Jun 2024,

Largetooth Flounder, Pseudorhombus arsius (Hamilton 1822)

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Widespread in Australia, from Cockburn Sound, Western Australia, around the tropical north to the Gippsland Lakes, Victoria, and from Cape Jervis to off Venus Bay, South Australia; also Ashmore Reef in the Timor Sea, and reefs in the Coral Sea. The Largetooth Flounder is uncommon in Victoria and Tasmania. Elsewhere the species is widespread in tropical and subtropical areas from the East African coast to the Western Central Pacific.
Inhabits silty and sandy areas in estuaries and coastal waters.


Dorsal fin 71–84; Anal fin 53–62; Caudal fin 15; Pectoral fin (eyed side) 12–13; Pelvic fin 6; Lateral-line scales 69–81; Gill rakers 1–7 + 8–15.
Body depth 43–56% SL; head length 28–30% SL, dorsal profile of head with slight notch in front of upper eye; upper eye diameter 16–23% HL; upper jaw length 37–46% HL; teeth small except for several pairs of enlarged canines anteriorly in each jaw; gill rakers pointed, longer than broad; scales ctenoid on eyed side, cycloid on blind side; dorsal fin origin in front of upper eye, above anterior nostrils. Scales on eyed side ctenoid, cyclolid on blind side.


D 71 - 84; A 53 - 62; P1 (eyed side) 12 - 13; LL 69 - 81. Dorsal profile of head with a slight notch in front of eye. Upper jaw reaching below posterior edge of lower eye. Several pairs of canine teeth in anterior parts of both jaws. Dorsal fin origin in front of upper eye. 


Eyed side greenish or brownish with dark blotch at front of straight part of lateral line and 2nd midway to tail, often with large dark spots or rings, sometimes encircled with small whitish spots;  fins with small dark brown spots;  blind side whitish.


The specific name arsius is derived from arsi, the common name for this species in Calcutta, India, the type locality.

Species Citation

Pleuronectes arsius Hamilton 1822, An Account of the Fishes Found in the River Ganges and its Branches: 128, 373. Type locality: estuary below Calcutta, India [Bay of Bengal].


Bray, D.J. 2020


Atlas of Living Australia

Largetooth Flounder, Pseudorhombus arsius (Hamilton 1822)


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Hamilton, F. 1822. An Account of the Fishes Found in the River Ganges and its Branches. Edinburgh : Archibald Constable 405 pp., pls 1-39. See ref at BHL

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Quick Facts

CAAB Code:37460009

Depth:3-178 m

Habitat:Sandy/muddy areas

Max Size:45 cm SL

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