Cymodocea rotundata 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Liliopsida Najadales Cymodoceaceae

Scientific Name: Cymodocea rotundata
Species Authority: Asch. & Schweinf.
Common Name(s):
English Species code: Cr
Taxonomic Notes: Cymodocea rotundata may include the species Cymodocea angustata

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2007-10-23
Assessor(s): Short, F.T. & Waycott, M.
Reviewer(s): Carpenter, K.E. & Livingstone, S.
This species is widespread and relatively common within its range. Although there are a number of localized threats that are contributing to seagrass decline, there is no current indication of widespread population reduction for this species. It is listed as Least Concern.

Geographic Range [top]

Range Description:Cymodocea rotundata has a wide Indo-Pacific distribution. In the Pacific, it is found from southern Japan, extending to Hainan, China, the Philippines, Malaysia, Indonesia, the southern tip of Vietnam, and the Gulf of Thailand across insular Southeast Asia to New Caledonia, northern Australia and across Micronesia.

In the Indian Ocean, it is found from Roebuck Bay in northwest Australia extending across the Timor Sea, the south coast of Indonesia, and throughout the Andaman Sea. In India, it is found from the Coromandel Coast to the Malabar Coast and in the Lakshadweep Islands; also in the Maldive Islands. It ranges from the Red Sea south to the east coast of South Africa to Madagascar and the islands of the western Indian Ocean.
Countries occurrence:
Australia; China; Egypt; India; Indonesia; Japan; Kenya; Madagascar; Malaysia; Marshall Islands; Mayotte; Micronesia, Federated States of ; Mozambique; New Caledonia; Palau; Papua New Guinea; Philippines; Saudi Arabia; Seychelles; Singapore; Tanzania, United Republic of; Thailand; United States Minor Outlying Islands; Vanuatu; Yemen
FAO Marine Fishing Areas:
Indian Ocean – western; Indian Ocean – eastern; Pacific – northwest; Pacific – western central
Lower depth limit (metres):10
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Cymodocea rotundata is common and widespread. The global population appears to be stable.
Current Population Trend:Stable
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Cymodocea rotundata often occurs in clear water, and often in the high intertidal zone. This species is resilient to marginal conditions. Like many intertidal species, this species' morphology can vary widely, and for this reason it can sometimes be confused with other species (i.e., with narrow leaf Thalassia hemprichii or wide Halodule uninervis). This species does not like full exposure at low tide (dry conditions).

In the Andaman Sea, it occupies the lower littoral zone on muddy sand areas or sandy bottom mixed with dead coral fragments. Cymodocea rotundata can survive a moderate level of disturbance. It is a pioneer species in Indonesia (along with Halophila ovalis and Halodule pinifolia) which occurs in the lower intertidal and shallow subtidal zones, growing best in well-sheltered sandy (not muddy), stable and low-relief sediments (Green and Short 2003).

Threats [top]

Major Threat(s): Cymodocea rotundata often forms a fringing bed, and therefore is present in areas exposed to impacts from coastal development and high anthropogenic activity. There are no major threats and threats tend to be localized.

Conservation Actions [top]

Conservation Actions: Cymodocea rotundata is present in some marine protected areas within its range. It does not have any specific conservation measures currently in place, though site and habitat protection and managements strategies are needed. More research is needed on this species on recruitment and reproduction, and taxonomy.

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 -> 9.8. Marine Neritic - Coral Reef -> 9.8.2. Back Slope
suitability: Suitable  
9. Marine Neritic -> 9.8. Marine Neritic - Coral Reef -> 9.8.4. Lagoon
suitability: Suitable  
9. Marine Neritic -> 9.8. Marine Neritic - Coral Reef -> 9.8.5. Inter-Reef Soft Substrate
suitability: Suitable  
9. Marine Neritic -> 9.8. Marine Neritic - Coral Reef -> 9.8.6. Inter-Reef Rubble Substrate
suitability: Suitable  
9. Marine Neritic -> 9.9. Marine Neritic - Seagrass (Submerged)
suitability: Suitable  
9. Marine Neritic -> 9.10. Marine Neritic - Estuaries
suitability: Suitable  
12. Marine Intertidal -> 12.2. Marine Intertidal - Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc
suitability: Suitable  
12. Marine Intertidal -> 12.4. Marine Intertidal - Mud Flats and Salt Flats
suitability: Suitable  
12. Marine Intertidal -> 12.6. Marine Intertidal - Tidepools
suitability: Suitable  
1. Land/water protection -> 1.1. Site/area protection
1. Land/water protection -> 1.2. Resource & habitat protection
2. Land/water management -> 2.1. Site/area management

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
1. Residential & commercial development -> 1.1. Housing & urban areas
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Residential & commercial development -> 1.2. Commercial & industrial areas
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Research -> 1.1. Taxonomy
1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
1. Research -> 1.5. Threats

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).

Citation: Short, F.T. & Waycott, M. 2010. Cymodocea rotundata. In: The IUCN Red List of Threatened Species 2010: e.T173363A6999692. . Downloaded on 27 November 2015.
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