| Biogeographic distributionC. ungulatus is widely distributed throughout the world, covering large coastal areasnear;
 
 
    as well as being found in Economic Exclusive Zones (EEZ);	Australia	Sri Lanka	Africa (Red Sea)	Middle East (Persian Gulf) 
 
    	French Polynesia	Mayotte	Réunion	New Caledonia   
 
   		The distribution of C. ungulatus. Map and distribution have been provided by ETIJ World Biodiversity.
 
For a better indication regarding the distribution of Cyclodius ungulatus here is a comprehensive list of locations where it has been sighted (list has been developed by ETI BioInformatics and was retrieved from Marine Species Identification Portal under synonymous name Phymodius ungulatus).
 
 
 Range: Red Sea (Kossmann, 1877); Zanzibar (Lenz, 1905); South Africa - Durban; Ile Europa (Serène, 1984); Mayotte (Serène, 1984); Madagascar - Nosy Bé, Banc Vert, Nosy Iranja and Fort-Dauphin (Serène, 1984); Iles Glorieuses (Serène, 1984); Aldabra Islands (Serène, 1984); Mauritius (Alcock, 1898, Bouvier, 1915b, Michel, 1964, Guinot, 1964b); Coëtivy Islands (Rathbun, 1911); Cargados Carajos Islands (Rathbun, 1911); Persian Gulf (Stephensen, 1945); Chagos Archipelago (Rathbun, 1911); Sri Lanka (Alcock, 1898); Andaman Islands (Alcock, 1898); Japan - Okinawa (Sakai, 1939), Amami-shoto and Yaeyama-retto (Sakai, 1976a), Ishigaki-jima (Miyake, 1983); China - Paracel Islands (Chen & Lan, 1978, Dai & Yang, 1991); Philippines - Balayan Bay (Garth & Kim, 1983); Balabac Starit (Dana, 1852); Indonesia - JavaSea, Celebes; Australia; New Britain - Kokopo near Rabaul (Takeda & Nunomura,1976); Solomon Islands -Guadalcanal Island, Torres Islands, and Saddle Island (Takeda & Nunomura,1976); New Caledonia - Poum (Takeda & Nunomura,1976); Samoa (Alcock, 1898, Dana, 1852); Hawaii - Honolulu (Rathbun, 1906); Line Islands - Palmyra (Edmondson, 1923); Tahiti (Dana, 1852, Guinot, 1964b). 
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