Sicyopterus eudentatus


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Sicyopterus eudentatus
Species Authority: Parenti & Maciolek, 1993

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(ii,iii,iv) ver 3.1
Year Published: 2012
Date Assessed: 2011-08-30
Assessor(s): Boseto, D.
Reviewer(s): Keith, P., Larson, H. & Hoese, D.
Facilitator/Compiler(s): Pippard, H.
The species is found on the islands of Pohnpei and Kosrae where its extent of occurrence is approximately 485 km². The species' area of occupancy is far less due to the distribution of available habitat (rivers). The species has been recorded from three locations (three rivers). There is continuing decline in the area of occupancy (the species was previously recorded from three rivers and more recently from only two), the area and quality of habitat, and in the number of locations (now two). This species is threatened by agricultural run-off from sakau production, which is altering the quality of rivers (i.e. the species' habitat).
The species is listed as Endangered.

Geographic Range [top]

Range Description: This species is endemic to the Federated States of Micronesia, where it is known from Pohnpei and Kosrae Islands in the Eastern Caroline Islands (Parenti and Maciolek 1993). It was described from 17 specimens from one river on Pohnpei. The island of Pohnpei is a total of 355 km² in area. Kosrae island is 110 km² in area.

There is a continuing decline in the area of occupancy (previously the species was recorded from three rivers and more recently from only two (Buden et al. 2001)), in the area and quality of habitat, and in the number of locations in which the species is found (now two).
Micronesia, Federated States of
FAO Marine Fishing Areas:
Pacific – western central
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species is amongst the least common, if not the rarest, of the gobies in Pohnpei rivers (Buden et al. 2001) and Kosrae rivers (D. Boseto pers. obs. 2008).
The 17 type specimens were found in the Nanpil-Kiepw river in 1982. In 2001, no specimens were found in the Nanpil-Kiepw river. One specimen was found in the Senipehn River at 92 m.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This is a large, herbivorous riverine goby (Nelson et al. 1996). The species is found in rivers on rocky substrates and feeds on algae.
Systems: Freshwater; Marine

Use and Trade [top]

Use and Trade: There is no information on the use and trade of this species.

Threats [top]

Major Threat(s): The production of sakau on Pohnpei has resulted in the deforestation, destruction and conversion of habitats on the island, often resulting in sedimentation (Merlin and Raynor 2005). This is a major threat to the species, as sedimentation can interfere with flow, recruitment and movement of the species.

Conservation Actions [top]

Conservation Actions: It is not known whether this species occurs in any protected areas.

Citation: Boseto, D. 2012. Sicyopterus eudentatus. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 04 September 2015.
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