Species Information

Omphalotropis costulata

Species Authority

(Mousson, 1870)

Species Status

Vulnerable

Organism Type

Mollusc

Taxonomy

Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Littorinimorpha
Family: Assimineidae

Environment/System

terrestrial

Invasive Species Threat Summary

This Vulnerable ground-dwelling detritivorous snail is endemic and widespread throughout lowland forests in the Lau group of Fiji. Over a large part of the snail’s range lowland forest habitat is subject to ongoing disturbance and degradation through processes such as agriculture, harvesting of wood and invasion by introduced species. Pacific rats (Rattus exulans) and black rats (Rattus rattus) are established throughout the snail’s range. These predatory mammals along with domestic fowl (Gallus gallus), pigs (Sus scrofa), cattle (Bos taurus), horses (Equus caballus) and goats (Capra hircus) are likely threats to this snail though disturbance of the microhabitat of the forest floor and/or predation. Other invasive species of concern are predatory ants including forest parrot ants (Paratrechina vaga), crazy ants (Paratrechina longicornis), ghost ants (Tapinoma melanocephalum), pennant ants (Tetramorium bicarinatum) and yellow crazy ants (Anoplolepis gracilipes) all of which are present over part of the snail’s range (Solem 1990; Ward and Wetterer 2006). The low relief of the island group means that the snail’s habitat is susceptible to changes in sea-level rises and increases in the frequency and intensity of extreme weather events associated with climate change.

Invasive Species Management Summary

There are no specific conservation measures in place for this snail. Surveys to determine the current distribution and population status of this snail are recommended. Continued biosecurity measures are critical to prevent the giant African snail (Achatina fulica), predatory rosy wolf snail (a href=http://www.issg.org/database/species/ecology.asp?si=92&fr=1&sts=&lang=EN>Euglandina rosea) and predatory flatworm (Platydemus manokwari) from establishing in Fiji. The giant African has the potential to displace indigenous land snails and has recently been shown to have predatory behaviour (Meyer et al. 2008). The predatory rosy wolf snail is used as a biological control against the giant African snail with resulting devastating consequences for indigenous land snail prey species (Cowie 2001, Barker and Efford 2004).

References

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CountryLocationTypeInvasive SpeciesCommon NameImpact Mechanism
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FijiAiwa LevuIslandPolynesian ratPredation (potential)
FijiAiwa LevuIslanddomestic goatGrazing/Herbivory/Browsing (potential)
FijiAiwa LevuIslandblack ratPredation (potential)
FijiAiwa LevuIslandferal pigPredation (potential)
FijiAiwa LevuIslandHorseTrampling (potential)
FijiAiwa LevuIslandRed JunglefowlHabitat alteration (potential)
FijiAiwa LevuIslandred junglefowlHabitat alteration (potential)
FijiAiwa LevuIslandCattleGrazing/Herbivory/Browsing (potential)
FijiFijiCountryGuinea antOther-physical disturbance (potential)
FijiFijiCountryYellow crazy antPredation (potential)

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An Initiative of the ACP Group, funded by the European Union under the 10th EDF