NATURAL HISTORY · CATALOGUE RECORD
Hardhead
Aythya australis (Eyton, 1838)
Source-backed taxonomic record
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Open encyclopedia reference
The hardhead (Aythya australis), also known as the white-eyed duck, is the only true diving duck found in Australia. The common name "hardhead" has nothing to do with the density of the bird's skull, instead referring to the difficulty encountered by early taxidermists in processing the head. Hardheads are found in wetter, coastal regions of Australia, particularly in the south-east, but are known to disperse as far afield as New Guinea, New Zealand, and the Pacific Islands.
Wikipedia contributors, Hardhead; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T01:23:09.592897+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Aythya australis (Eyton, 1838)
- Name authority
- (Eyton, 1838)
- Common name
- Hardhead
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Aves
- Order
- Anseriformes
- Family
- Anatidae
- Genus
- Aythya
- Extinction status
- Recorded extant
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- megaclassTetrapoda
- classAves
- orderAnseriformes
- familyAnatidae Leach, 1820
- genusAythya F. Boie, 1822
- speciesAythya australis (Eyton, 1838)
Close classified relatives
These entries share the source’s genus, Aythya. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Tufted DuckAythya fuligula (Linnaeus, 1758) | AnatidaeChordata | Accepted speciesRecorded extant |
| Baer's PochardAythya baeri (Radde, 1863) | AnatidaeChordata | Accepted speciesRecorded extant |
| Ring-necked DuckAythya collaris (Donovan, 1809) | AnatidaeChordata | Accepted speciesRecorded extant |
| Common PochardAythya ferina (Linnaeus, 1758) | AnatidaeChordata | Accepted speciesRecorded extant |
| CanvasbackAythya valisineria (A. Wilson, 1814) | AnatidaeChordata | Accepted speciesRecorded extant |
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Nyroca australis Eyton, 1838 Eyton, 1838 | synonym |
| Aythya australis australis (Eyton, 1838) (Eyton, 1838) | synonym |
| Aythya australis extima Mayr, 1940 Mayr, 1940 | synonym |
Documented distribution
Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.
Southern Asia
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=175136 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record. A suitable sourced image remains to be added.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:K56Q. Classification follows source parent identifiers. English common names may vary by region.