BIOTIC Species Information for Thieliana navis
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| Researched by | Nicola White | Data supplied by | MarLIN | ||||||||||||
| Refereed by | Dr Richard S.K. Barnes | ||||||||||||||
| Taxonomy | |||||||||||||||
| Scientific name | Thieliana navis | Common name | A hydroid | ||||||||||||
| MCS Code | D260 | Recent Synonyms | Clavopsella navis, Rhizorhagium navis | ||||||||||||
| Phylum | Cnidaria | Subphylum | |||||||||||||
| Superclass | Hydrozoa | Class | Leptolida | ||||||||||||
| Subclass | Anthoathecatae | Order | Filifera | ||||||||||||
| Suborder | Family | Bougainvilliidae | |||||||||||||
| Genus | Thieliana | Species | navis | ||||||||||||
| Subspecies | |||||||||||||||
| Additional Information | The 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 form | Turf |
Feeding method | Passive suspension feeder Predator |
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| Mobility/Movement | Permanent attachment |
Environmental position | Epifaunal Epiphytic Epilithic |
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| Typical food types | No text entered | Habit | Attached | ||||||||||||
| Bioturbator | Not relevant | Flexibility | High (>45 degrees) | ||||||||||||
| Fragility | Fragile | Size | Very small(<1cm) | ||||||||||||
| Height | Up to 5 mm | Growth Rate | Insufficient information | ||||||||||||
| Adult dispersal potential | Insufficient information | Dependency | Independent | ||||||||||||
| Sociability | Colonial | ||||||||||||||
| Toxic/Poisonous? | No | ||||||||||||||
| General Biology Additional Information | Size refers to length of hydranth. | ||||||||||||||
| Biology References | Millard, 1975, Eno et al., 1997, Boero, 1984, Gili & Hughes, 1995, | ||||||||||||||
| 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) |
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| Biological zone | Insufficient information |
Wave exposure | Very Sheltered |
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| Tidal stream strength/Water flow | Weak (<1 kn) |
Salinity | Reduced (18-30 psu) |
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| 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, | ||||||||||||||
| Reproduction/Life History | |||||||||||||||
| Reproductive type | Gonochoristic |
Developmental mechanism | Insufficient information |
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| Reproductive Season | Insufficient information | Reproductive Location | As adult | ||||||||||||
| Reproductive frequency | Regeneration potential | No | |||||||||||||
| Life span | Insufficient information | Age at reproductive maturity | Insufficient information | ||||||||||||
| Generation time | Insufficient information | Fecundity | Ca 8 eggs | ||||||||||||
| Egg/propagule size | Fertilization type | ||||||||||||||
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| Reproduction Preferences Additional Information | Female 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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