BIOTIC Species Information for Hydrallmania falcata
Researched byCharlotte Marshall Data supplied byMarLIN
Refereed byThis information is not refereed.
Scientific nameHydrallmania falcata Common nameA hydroid
MCS CodeD424 Recent SynonymsNot researched

PhylumCnidaria Subphylum
SuperclassHydrozoa ClassLeptolida
SubclassLeptothecatae OrderConica
SuborderPlumulariida FamilySertulariidae
GenusHydrallmania Speciesfalcata

Additional Information
Taxonomy References
General Biology
Growth formArticulate
Feeding methodPassive suspension feeder
Mobility/MovementPermanent attachment
Environmental positionEpifaunal
Typical food types HabitErect
BioturbatorNot relevant FlexibilityHigh (>45 degrees)
FragilityFragile SizeMedium(11-20 cm)
HeightUp to 64 cm Growth Rate
Adult dispersal potential10-100m DependencyIndependent
General Biology Additional InformationHeight can reach 64 cm although it is more commonly 10-30 cm (Cornelius, 1995b).
Biology References Cornelius, 1995b, Kosevich, 2006,
Distribution and Habitat
Distribution in Britain & IrelandCommon off all British coasts (Hayward & Ryland, 1995b).
Global distributionGlobal distribution from the Arctic to south-west Europe.
Biogeographic rangeNot researched Depth rangeDepth range 20-100 m.
Distribution Additional Information

Substratum preferencesPebbles
Coarse clean sand
Fine clean sand
Physiographic preferences
Biological zone Wave exposure
Tidal stream strength/Water flow Salinity
Habitat Preferences Additional InformationCommon in sandy areas on shells, stones etc (Hayward & Ryland, 1995b).
Distribution References Hayward & Ryland, 1995b,
Reproduction/Life History
Reproductive type Developmental mechanism
Reproductive SeasonDecember to April Reproductive LocationInsufficient information
Reproductive frequencyAnnual episodic Regeneration potential Yes
Life spanInsufficient information Age at reproductive maturityInsufficient information
Generation timeInsufficient information FecundityInsufficient information
Egg/propagule size140 µm Fertilization typeInternal
Larval/Juvenile dispersal potentialInsufficient information Larval settlement periodInsufficient information
Duration of larval stageInsufficient information   
Reproduction Preferences Additional InformationPlanula larvae (Hayward & Ryland, 1995b). The Marine Biological Association (1957) reported the reproductive season as December to April in the south-west of England.
Reproduction References Hayward & Ryland, 1995b, MBA, 1957, Kosevich, 2006,
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