Craterocephalus eyresii
species of fish
Craterocephalus eyresii, the Lake Eyre hardyhead, is a species of freshwater silverside from the family Atherinidae which is endemic to the Lake Eyre basin in Australia.
Until the late 20th century, this taxon was more widely circumscribed. After it was revealed to be a cryptic species complex, C.eyresii was split up into four species – apart from the Lake Eyre hardyhead proper, these are the Darling River hardyhead (C. amniclus), Finke River hardyhead (C. centralis), and Murray hardyhead (C. fluviatilis), each of the four being restricted to their namesake river basins. Until then, only the Murray-Murrumbidgee population had been comprehensively studied. Thus, until the 1990s, much of the published information which supposedly refers to "Lake Eyre hardyheads" actually refers to the Murray hardyhead.
Description
Craterocephalus eyresii is a small, drab yellowish-grey coloured fish with greenish-silvery underside, transparent yellowish fins, and dark melanpophores around a silver mid-lateral stripe. There are two dorsal fins which are widely separated with the first dorsal fin originating before the tips of the ventral fins and the anal fin origin lies directly underneath the origin of second dorsal fin. The caudal fin is forked. The fins are yellowish in colour. It attains a maximum total length of 10 centimetres (3.9 in).
The public source identifies “Craterocephalus eyresii” as species of fish. This brief keeps that definition visible, then builds a research path around Craterocephalus, eyresii and species.
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Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated May 27, 2026. The linked authority identifier is Q2223733. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Craterocephalus eyresii” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.