(Lund, 1793) 
T. orientalis is known by a number of common names. The United Nations' Food and Agriculture Organization prefers the name flathead lobster, while the official Australian name is Bay lobster. In Australia, it is more widely known as the Moreton Bay bug after Moreton Bay, a location in Queensland. In Singapore, both the flathead lobster and true crayfish are called crayfish. They are used in many Singaporean dishes. The species is sometimes confused with the Balmain bug, Ibacus peronii, but they can be distinguished by the placement of the eyes: the eyes of I. peronii are near the midline, while those of T. orientalis are at the margin of the carapace.
Thenus orientalis has an Indo-West Pacific distribution, ranging from the east coast of Africa (southern Red Sea, to Natal) to China including the Persian Gulf, southern Japan, the Philippines and along the northern coast of Australia from Western Australia to Queensland. They are also caught on a small scale off the shores of Malaysia and Singapore.
- T. Y. Chan, M. Butler, A. Cockcroft, A. MacDiarmid, R. Wahle & P. Ng Kee Lin (2011). "Thenus orientalis". IUCN Red List of Threatened Species. Version 2011.2. International Union for Conservation of Nature. Retrieved December 31, 2011.
- Lund, N. T. (1793). "Slægten Scyllarus. Iagttagelser til Insekternes Historie. I.". Skr. Naturh.-Selsk. Kiobenhavn 2 (2): 17–22.
- Lipke B. Holthuis (1991). "Thenus orientalis". Marine Lobsters of the World. FAO Fisheries Synopsis No. 125. Food and Agriculture Organization. pp. 227–228. ISBN 92-5-103027-8.
- "Species Thenus orientalis (Lund, 1793)". Australian Faunal Directory. Department of the Environment, Water, Heritage and the Arts. June 3, 2010. Retrieved October 28, 2010.
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- "Balmain Bug Ibacus peronii". New South Wales Department of Primary Industries. Retrieved 6 September 2010.