Overview

Distribution

Range Description

This species occurs in the southern Red Sea and the Gulf of Aden (Röckel et al. 1995), along a coastline of approx 2,400 km. The EOO and exceeds the thresholds for criterion B1, however the AOO is within the threshold for criterion B2 and taking a precautionary approach the number of locations is ten or maybe fewer (based on pollution events). The species is strictly endemic to the area. Specimens are generally taken from dredging and landed in the harbour of Djibouti.

The range on the distribution map is likely to be larger than the actual range of this species, with an estimated AOO of less than 2,000 km2.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species is known to occur in shallow calm water amongst fine rubble (Sharabati 1984). Adults of the species will grow to approx 49 mm although they will typically be less than this (Röckel et al. 1995). The species has lecithotrophic larval development. It occurs in shallow water, is a fish-hunting species and has a fragile shell (G. Raybaudi pers. comm. October 2011).

Systems
  • Marine
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
B2ab(iii)

Version
3.1

Year Assessed
2013

Assessor/s
Raybaudi-Massilia, G.

Reviewer/s
Peters, H. & Veldsman, S.G.

Contributor/s

Justification
Although not widely distributed, this species occurs in politically unstable regions which may provide some protection from over-gathering. However, pollution around the area of the main population (Djibouti) is an issue and pollution events may also occur in other parts of its range. Given a confirmed distribution along a stretch of coast of around 750 km2 with a threat of pollution from harbour activity and municipal development suggests that the population occurs in ten or fewer locations (a single pollution event can affect a relatively large area). The shallow water habitat of this species and its thin shell make it vulnerable to these type of threats. Ongoing decline in habitat quality is likely to affect the main population particularly if pollution continues in Djibouti waters. The species has therefore been classified as Vulnerable B2ab(iii).
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Population

Population
There is no population information for this species. The main population location is in Djibouti (G. Raybaudi and S. Veldsman pers. comm. October 2011).
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Threats

Major Threats
The shallow waters around Djibouti, where the main population has been reported, is subject to pollution especially from the harbour area (G. Raybauid and E. Monnier pers. comm October 2011). The species has a fragile shell and highly specialized ecology, which may make it more susceptible to such impacts. Ongoing pollution in the area suggests that there will be a continuing decline in quality of habitat if pollution continues.
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Management

Conservation Actions

Conservation Actions
There are no known conservation measures currently in place for this species. The species may benefit from area protection afforded to the Red Sea, where collection is now forbidden. However, the main population is found around Djibouti where pollution is the main problem.
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