Wrack (seaweed) (Posidonia australis)
Source-cited species reference: taxonomy from WoRMS, biology from SeaLifeBase, occurrence map from GBIF, conservation from IUCN Red List.
Distribution map plotted from GBIF.org occurrence records; basemap Natural Earth 110m · GBIF records CC0 / CC BY; Natural Earth public domain
Wrack (seaweed) (Posidonia australis) is a marine species in the family Posidoniaceae (Tracheophyta › Magnoliopsida › Alismatales), recorded in the World Register of Marine Species as Posidonia australis J.D.Hooker, 1858 under AphiaID 374712.
- Scientific name
- Posidonia australis
- Authority
- J.D.Hooker, 1858
- Family
- Posidoniaceae
- Order
- Alismatales
- Habitat zone
- epiphytic
- Iucn red list
- Near Threatened
- Gbif occurrence records
- 2,905
Classification (WoRMS)
Full classification as recorded by WoRMS: Kingdom: Plantae · Phylum: Tracheophyta · Class: Magnoliopsida · Order: Alismatales · Family: Posidoniaceae · Genus: Posidonia.
Accepted name: Posidonia australis · Authority: J.D.Hooker, 1858 · Taxonomic status: accepted · AphiaID: 374712.
Source: World Register of Marine Species (WoRMS) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=374712 (CC BY 4.0). Accessed 2026-09-23.
Biology and life history (SeaLifeBase)
Measured values published by SeaLifeBase for Posidonia australis. Only fields the database actually holds for this species are shown; these are database values, not aquarium guidance.
Habitat zone: epiphytic · Aquarium trade: never/rarely.
Source: SeaLifeBase species summary (SpecCode 166789) — https://www.sealifebase.se/summary/Posidonia-australis.html (CC BY-NC 3.0 — non-commercial use only). Accessed 2026-09-23.
Distribution and occurrence records (GBIF)
2,905 georeferenced occurrence records for Posidonia australis are published through GBIF from 1 countries or marine areas. The map above plots 58 distinct locations from a sample of 2,905 records, omitting 56 inland records that carry an institution's coordinates rather than a collection site; it shows where the species has been observed and reported, not a modelled range.
Most records by country or area: Australia (2,905).
The full country table, WoRMS marine regions and the sampling notes are on this species' Distribution page.
Source: GBIF Occurrence Search (taxonKey 5328658) — https://www.gbif.org/occurrence/search?taxon_key=5328658&has_coordinate=true (records CC0 / CC BY); WoRMS distribution records (MarineRegions) — https://www.marinespecies.org/aphia.php?p=taxdetails&id=374712 (CC BY 4.0); Natural Earth 110m basemap — https://www.naturalearthdata.com/ (public domain). Accessed 2026-09-23.
Conservation status (IUCN Red List)
The IUCN Red List assesses Posidonia australis Hook.f. as Near Threatened (code NT). No trend, population estimate or threat analysis is given here, because none is available from this source without the Red List API; follow the source link for the full assessment, including its date.
Source: IUCN Red List of Threatened Species (taxon 173333) — https://www.iucnredlist.org/species/173333/0; GBIF IUCN Red List category endpoint (taxonKey 5328658) — https://api.gbif.org/v1/species/5328658/iucnRedListCategory. Accessed 2026-09-23.
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