BIOTIC Species Information for Thieliana navis
Researched byNicola White Data supplied byMarLIN
Refereed byDr Richard S.K. Barnes
Scientific nameThieliana navis Common nameA hydroid
MCS CodeD260 Recent SynonymsClavopsella navis, Rhizorhagium navis

PhylumCnidaria Subphylum
SuperclassHydrozoa ClassLeptolida
SubclassAnthoathecatae OrderFilifera
Suborder FamilyBougainvilliidae
GenusThieliana Speciesnavis

Additional InformationThe systematic status of this species was revised recently by Stepanjants et al. (2000) who placed Clavopsella navis and Clavopsella quadrangularia in the new genus Thieliana.
Taxonomy References Howson & Picton, 1997, Barnes, 1994, Millard, 1975, Gili & Hughes, 1995, Stepanjants et al., 2000,
General Biology
Growth formTurf
Feeding methodPassive suspension feeder
Mobility/MovementPermanent attachment
Environmental positionEpifaunal
Typical food typesNo text entered HabitAttached
BioturbatorNot relevant FlexibilityHigh (>45 degrees)
FragilityFragile SizeVery small(<1cm)
HeightUp to 5 mm Growth RateInsufficient information
Adult dispersal potentialInsufficient information DependencyIndependent
General Biology Additional InformationSize refers to length of hydranth.
Biology References Millard, 1975, Eno et al., 1997, Boero, 1984, Gili & Hughes, 1995,
Distribution and Habitat
Distribution in Britain & IrelandWidewater lagoon, West Sussex.
Global distributionRecorded from only 3 locations worldwide: Kiel Canal, Widewater lagoon in Sussex and attached to a ship's hull in South Africa.
Biogeographic rangeNot researched Depth rangeInsufficient information
MigratoryNon-migratory / Resident   
Distribution Additional InformationThieliana 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 preferencesAlgae
Physiographic preferencesIsolated saline water (Lagoon)
Biological zoneInsufficient information
Wave exposureVery Sheltered
Tidal stream strength/Water flowWeak (<1 kn)
SalinityReduced (18-30 psu)
Habitat Preferences Additional InformationNone entered
Distribution References Barnes, 1994, Millard, 1975, Sheader & Sheader, 1990, Eno et al., 1997, Anonymous, 1999(s), Reise et al., 1999, Boero, 1984,
Reproduction/Life History
Reproductive typeGonochoristic
Developmental mechanismInsufficient information
Reproductive SeasonInsufficient information Reproductive LocationAs adult
Reproductive frequency Regeneration potential No
Life spanInsufficient information Age at reproductive maturityInsufficient information
Generation timeInsufficient information FecundityCa 8 eggs
Egg/propagule size Fertilization type
Larval/Juvenile dispersal potentialInsufficient information Larval settlement period
Duration of larval stageInsufficient information   
Reproduction Preferences Additional InformationFemale gonophores contain about 8 eggs, which develop directly into planulae. There is no free-living medusoid stage.
Reproduction References Millard, 1975,
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