Hydrallmania falcata

Researched By	Charlotte Marshall	Data Supplied By	MarLIN
Refereed by	This information is not refereed.
Taxonomy
Scientific name	Hydrallmania falcata	Common name	A hydroid
MCS Code	D424	Recent Synonyms	Not researched
Phylum	Cnidaria	Subphylum
Superclass	Hydrozoa	Class	Leptolida
Subclass	Leptothecatae	Order	Conica
Suborder	Plumulariida	Family	Sertulariidae
Genus	Hydrallmania	Species	falcata
Subspecies
Additional Information
Taxonomy References
General Biology
Growth form	Articulate	Feeding method	Passive suspension feeder
Mobility/Movement	Permanent attachment	Environmental position	Epifaunal, Epilithic
Typical food types		Habit	Erect
Bioturbator	Not relevant	Flexibility	High (>45 degrees)
Fragility	Fragile	Size	Medium(11-20 cm)
Height	Up to 64 cm	Growth Rate
Adult dispersal potential	10-100m	Dependency	Independent
Sociability	Colonial
Toxic/Poisonous?	No
Additional Information	Height 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 & Ireland	Common off all British coasts (Hayward & Ryland, 1995b).
Global distribution	Global distribution from the Arctic to south-west Europe.
Biogeographic range	Not researched	Depth range	Depth range 20-100 m.
Migratory
Distribution Additional Information
Substratum preferences	Pebbles, Coarse clean sand, Fine clean sand	Physiographic preferences
Biological zone		Wave exposure
Tidal stream strength/Water flow		Salinity
Habitat Additional Information	Common in sandy areas on shells, stones etc (Hayward & Ryland, 1995b).
AMBI Group (Borja et al., 2000)	not assigned
Distribution References	Hayward & Ryland, 1995b
Reproduction/Life History
Reproductive type		Developmental mechanism
Reproductive Season	December to April	Reproductive Location	Insufficient information
Reproductive frequency	Annual episodic	Regeneration potential	Yes
Life span	Insufficient information	Age at reproductive maturity	Insufficient information
Generation time	Insufficient information	Fecundity	Insufficient information
Egg/propagule size	140 µm	Fertilization type	Internal
Larvae/Juveniles Larval/Juvenile dispersal potential Insufficient information Larval settlement period Insufficient information Duration of larval stage Insufficient information
Additional Information	Planula 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