''Helcogramma lacuna'', the cavern triplefin, is a species of

triplefin Threefin or triplefin blennies are blenniiforms, small percomorph marine fish of the family Tripterygiidae. Found in tropical and temperate waters of the Atlantic, Pacific and Indian Oceans, the family contains about 150 species in 30 genera. Th ...

blenny in the genus ''

Helcogramma ''Helcogramma'' is a genus in the triplefin family (biology), family Tripterygiidae. The blennies in the genus ''Helcogramma'' are found throughout the Indo-Pacific and in the South Atlantic Ocean off the islands of St Helena and Ascension Island ...

''. It was described by Jeffrey T. Williams and Jeffery C. Howe in 2003. This species has only been recorded in the Similan Islands in the

Andaman Sea The Andaman Sea (historically also known as the Burma Sea) is a marginal sea of the northeastern Indian Ocean bounded by the coastlines of Myanmar and Thailand along the Gulf of Martaban and west side of the Malay Peninsula, and separated from ...

, part of Thailand.

References

{{Taxonbar, from=Q960893 lacuna Fish described in 2003