Phonicosia circinata is widely distributed in the southern Pacific, Atlantic and Indian Oceans. The extent of frontal calcification varies considerably.
Synonyms
| Synonyms | Author | |
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| Phonicosia jousseaumei | Jullien, 1888 | (fide Hayward 1991) |
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Original description: Lepralia circinata MacGillivray, 1869
Locality: Queenscliff, Victoria.
Type specimen: NMV F45696 (chosen by Brown, 1952)
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