Halophila euphlebia 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Liliopsida Hydrocharitales Hydrocharitaceae

Scientific Name: Halophila euphlebia Makino
Common Name(s):
English Species code: Hf
Taxonomic Notes: Halophila euphlebia has recently been recognized as distinct by Uchimura et al. (2006, 2008); however, previous evidence suggested that it is possibly a synonym of H. ovalis (McMahon 2005) or H. major (Kua et al. 2006).

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2010
Date Assessed: 2007-10-23
Assessor(s): Short, F.T., Carruthers, T.J.R., Waycott, M., Kendrick, G.A., Fourqurean, J.W., Callabine, A., Kenworthy, W.J. & Dennison, W.C.
Reviewer(s): Livingstone, S., Harwell, H. & Carpenter, K.E.
Halophila euphlebia is endemic to Japan. There is little information about population or trends. Specific threats are not known for H. euphlebia. However, in Japan, localized threats may include coastal development, land reclamation water pollution and trawling. Halophila euphlebia has taxonomic issues, and may be the same species as H. ovalis. The distribution of this species is not fully known, and therefore is listed as Data Deficient. If it is shown to be a distinct species then it is likely to fall into a threatened category due to the small range size and present threats.

Geographic Range [top]

Range Description:Halophila euphlebia is endemic to Japan. It occurs in the Ryukyu Islands and southeast Japan (Uchimura et al. 2006). There is a possibility that this species has been collected in the Philippines, and may be misidentified based on genetics as H. ovalis (Uchimura  et al. 2006).
Countries occurrence:
FAO Marine Fishing Areas:
Pacific – northwest
Additional data:
Lower depth limit (metres):20
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There is little population information for H. euphlebia and the trends are unknown.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Halophila euphlebia is most frequently encountered in the subtidal part of relatively calm coasts where it forms extensive beds on sand or mud (Uchimura et al. 2006). It is found growing in both shallow and deep waters, up to depths of 20 m.

Plants from the different localities are very similar in habitat, but display slight size and colour variations which may be correlated with differences in some environmental factors such as depth, salinity, temperature or light. Fruits are abundant in plants collected in May, June and July from Nakagusuku Bay (Uchimura et al. 2006). Male and female flowers form singly in separate plants at the bases of leaf pairs.
Generation Length (years):4

Threats [top]

Major Threat(s): Specific threats are unknown for Halophila euphlebia. However in Japan, localized threats may include coastal development, land reclamation, water pollution and trawling (Green and Short 2003, Short et al. 2007).

Conservation Actions [top]

Conservation Actions: There are no known conservation measures for H. euphlebia.

Research is need on this species on taxonomy, population trends and threats.

Citation: Short, F.T., Carruthers, T.J.R., Waycott, M., Kendrick, G.A., Fourqurean, J.W., Callabine, A., Kenworthy, W.J. & Dennison, W.C. 2010. Halophila euphlebia. The IUCN Red List of Threatened Species 2010: e.T173325A6991162. . Downloaded on 18 June 2018.
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