Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Liliopsida Najadales Cymodoceaceae

Scientific Name: Cymodocea angustata
Species Authority: Ostenf.
Common Name(s):
English Species code: Ca
Taxonomic Notes: Cymodocea angustata may be included within Cymodocea rotundata.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2008-03-18
Assessor(s): Waycott, M.
Reviewer(s): Short, F.T. & Livingstone, S.
Cymodocea angustata is endemic to tropical Western Australia and is only known from a few samples, primarily due to the fact that its distribution is in remote locations. The overall population trend is unknown. Due to its relatively remote location, it may be somewhat protected from coastal anthropogenic threats, although mining activities may threaten the species. More research on Cymodocea angustata is needed on taxonomy and general biology, and population status. Although this species is not well known, it is found in remote areas that remain undisturbed. Cymodocea angustata is listed as Least Concern.

Geographic Range [top]

Range Description:Cymodocea angustata is endemic to tropical Western Australia. It is found from Collier Bay to Shark Bay.
Countries occurrence:
FAO Marine Fishing Areas:
Indian Ocean – eastern
Lower depth limit (metres):7
Upper depth limit (metres):1
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Cymodocea angustata has been rarely collected, primarily due to the fact that its distribution is in remote locations. The overall population trend is unknown.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Cymodocea angustata grows on coarse sand, sand patches and fine grained sediment. It is often found growing together with other species (Posidonia spp. and Amphibolis spp.) (McMillan et al. 1983). This species was collected at about seven m depth in the Monte Bello Islands (McMillan et al. 1983).

Threats [top]

Major Threat(s): Cymodocea angustata is found in a remote part of Australia, and therefore it is removed from coastal anthropogenic threats. There are however current developments underway for mining activities within its distribution (M. Waycott pers. comm. 2008).

Conservation Actions [top]

Conservation Actions: Cymodocea angustata is included in the Shark Bay World Heritage Property which contains more than 4,000 kmĀ² of seagrass beds of high density (Green and Short 2003). More research on Cymodocea angustata is needed on taxonomy and general biology including recruitment and reproduction.

Classifications [top]

9. Marine Neritic -> 9.4. Marine Neritic - Subtidal Sandy
suitability: Suitable  
9. Marine Neritic -> 9.5. Marine Neritic - Subtidal Sandy-Mud
suitability: Suitable  
9. Marine Neritic -> 9.9. Marine Neritic - Seagrass (Submerged)
suitability: Suitable  

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
  Occur in at least one PA:Yes
In-Place Species Management
In-Place Education
3. Energy production & mining -> 3.2. Mining & quarrying
♦ timing: Ongoing    

1. Research -> 1.1. Taxonomy
1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Green, E.P. and Short, F.T. 2003. World Atlas of Seagrasses. University of California Press, Berkeley.

IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: (Accessed: 2 September 2010).

McMillan, C., Young, P.C., Cambridge, M.L., Masini, R.J. and Walker, D.I. 1983. The status of an endemic Australian seagrass, Cymodocea angustata Ostenfeld. Aquatic Botany 17: 231-241.

Citation: Waycott, M. 2010. Cymodocea angustata. In: The IUCN Red List of Threatened Species 2010: e.T173340A6994779. . Downloaded on 09 October 2015.
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