BIOTIC

BIOTIC Species Information for Thieliana navis
All Taxonomy Biology Distribution Reproduction

Researched by	Nicola White	Data supplied by	MarLIN
Refereed by	Dr Richard S.K. Barnes
Distribution and Habitat
Distribution in Britain & Ireland	Widewater lagoon, West Sussex.
Global distribution	Recorded from only 3 locations worldwide: Kiel Canal, Widewater lagoon in Sussex and attached to a ship's hull in South Africa.
Biogeographic range	Not researched	Depth range	Insufficient information
Migratory	Non-migratory / Resident
Distribution Additional Information	Thieliana navis is presumed to be an introduced species since it has only ever been recorded in the vicinity of ports and harbours. It is probably transported on ships hulls. It was first recorded in the UK in 1973 in Widewater Lagoon, Shoreham, West Sussex (Eno et al., 1997). It was last recorded there (as Clavopsella navis) by Sheader (1990) in 1990 when it was relatively abundant attached to algae. It is presumed extinct in South Africa as it has only been recorded from one ship's hull in 1959. The condition of the population in Kiel is not known.

Substratum preferences	Algae	Physiographic preferences	Isolated saline water (Lagoon)
Biological zone	Insufficient information	Wave exposure	Very Sheltered
Tidal stream strength/Water flow	Weak (<1 kn)	Salinity	Reduced (18-30 psu)
Habitat Preferences Additional Information	None entered
Distribution References	Barnes, 1994, Millard, 1975, Sheader & Sheader, 1990, Eno et al., 1997, Anonymous, 1999(s), Reise et al., 1999, Boero, 1984,