The upside-down pipefish (Heraldia nocturna) is a species of pipefish endemic to the coast of southern Australia, from New South Wales to Geographe Bay in Western Australia, where it is found in rocky reefs at depths of from 2 to 15 metres (6.6 to 49.2 ft). It grows to a length of 9.2 centimetres (3.6 in) SL. This species is the only known member of its genus. Like other pipefish it is ovoviviparous but it may breed seasonally, as gravid males have been collected between September and November.
This genus was named in honor of Earl Stannard Herald, an American expert on syngnathids who died as a result of a diving accident off of Cabo San Lucas, Mexico. The common name, "upside-down pipefish", comes from its habit of swimming upside down in caves before emerging at night to feed, and this nocturnal habit gives rise to its specific name, nocturna.
- Jamieson, O. & Pollom, R. (2016). "Heraldia nocturna (errata version published in 2017)". The IUCN Red List of Threatened Species. 2016: e.T65368085A115424228. doi:10.2305/IUCN.UK.2016-3.RLTS.T65368085A67624180.en.
- Bray, D.J. & Thompson, V.J. (2017). "Heraldia nocturna". Fishes of Australia. Museums Victoria. Retrieved 2 Jun 2018.
- Froese, Rainer and Pauly, Daniel, eds. (2006). "Heraldia nocturna" in FishBase. February = 2018 2006 version.
- J.R. Paxton (1975). "Heraldia nocturna, a new genus and species of pipefish (family Syngnathidae) from eastern Australia with comments on Maroubra perserrata Whitley". Proceedings of the California Academy of Sciences. 40: 439–447.
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