BIOTIC Species Information for Ascidia spp.
Researched bySean Lindsley-Leake Data supplied byMarLIN
Refereed byThis information is not refereed
Scientific nameAscidia spp. Common nameA sea squirt
MCS CodeZD87 Recent Synonymsnone

PhylumChordata SubphylumTunicate
Superclass ClassAscidiacea
Subclass OrderEnterogona
SuborderPhlebobranchia FamilyAscidiidae
GenusAscidia Species

Additional Information
Taxonomy References
General Biology
Growth form Feeding method
Mobility/MovementPermanent attachment
Environmental position
Typical food typesphytoplankton HabitAttached
Bioturbator FlexibilityHigh (>45 degrees)
FragilityFragile SizeSmall-medium(3-10cm)
Height Growth RateNot researched
Adult dispersal potentialNot researched DependencyIndependent
General Biology Additional Information
Biology References Havenhand & Svane, 1989, Millar, 1970,
Distribution and Habitat
Distribution in Britain & IrelandFound on all British and Irish coasts especially western Scotland.
Global distributionFound in the north-east Atlantic from Norway to the Azores, in the Mediterranean, southern Africa, Indian Ocean, south-east Asia and eastern Australia, and on both west and east coasts of North America.
Biogeographic rangeCold temperate to warm temperate. Depth range
Distribution Additional Information

Substratum preferences Physiographic preferences
Biological zone Wave exposure
Tidal stream strength/Water flow Salinity
Habitat Preferences Additional Information
Distribution References Havenhand, 1991, Havenhand & Svane, 1989,
Reproduction/Life History
Reproductive typePermanent hermaphrodite
Developmental mechanismLecithotrophic
Reproductive SeasonAll year, peaks in August and September Reproductive LocationWater column
Reproductive frequencyAnnual episodic Regeneration potential No
Life span1-2 years Age at reproductive maturityInsufficient information
Generation timeInsufficient information Fecundity6-8
Egg/propagule sizedependant on species Fertilization typeExternal
Larval/Juvenile dispersal potential1km-10km Larval settlement periodAugust and September
Duration of larval stage2-10 days   
Reproduction Preferences Additional InformationCan delay metamorphosis of tadpole larvae according to suitable substratum and presence/absence of predators/conspecifics
Reproduction References Svane & Lundalv, 1981, Havenhand, 1991, Havenhand & Svane, 1989, Millar, 1970, Svane & Young, 1989, Tarjuelo & Turon, 2004,
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