BIOTIC Species Information for Chlamys spp.
Researched bySean Lindsley-Leake Data supplied byMarLIN
Refereed byThis information is not refereed
Scientific nameChlamys spp. Common nameA bivalve mollusc
MCS CodeW1774 Recent Synonyms

PhylumMollusca Subphylum
Superclass ClassPelecypoda
SubclassPteriomorphia OrderOstreoida
SuborderPectinina FamilyPectinidae
GenusChlamys Species

Additional Information
Taxonomy References Spencer, 2002,
General Biology
Growth form Feeding method
Temporary attachment
Environmental position
Typical food typesPhytoplankton, detritus HabitAttached
Bioturbator FlexibilityNone (< 10 degrees)
FragilityRobust SizeSmall-medium(3-10cm)
Height Growth Rate
Adult dispersal potential DependencyIndependent
General Biology Additional Information
Biology References Spencer, 2002, Mason, 1983,
Distribution and Habitat
Distribution in Britain & Ireland
Global distribution
Biogeographic range 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
Reproduction/Life History
Reproductive typePermanent hermaphrodite
Developmental mechanismPlanktotrophic
Reproductive SeasonSee additional information Reproductive LocationWater column
Reproductive frequencyAnnual episodic Regeneration potential No
Life spanSee additional information Age at reproductive maturitySee additional information
Generation time1-2 years Fecundity3-6 million
Egg/propagule size70 µm Fertilization typeExternal
Larval/Juvenile dispersal potential1km-10km Larval settlement periodYear round
Duration of larval stage1-2 months   
Reproduction Preferences Additional InformationLife span varies according to location and species. With Chlamys opercularis having a life span of 3-5years, and Chlamys icelandica living for in excess of 20 years. Whilst initial reproductive maturity is reached in 1 year, this spawning is seen to be significantly less than in specimens that are two years old or older. There are three spawning periods in each year, July-August, Sept-Oct, Jan-Feb, with the main spawning period in August. The spat aseetling time is substrate dependant with the main recruitment taking place over a period of 15 to 25 days during September.
Reproduction References Hodgson & Burke, 1988, Spencer, 2002, Bokordt et al., 2000, Broom & Mason, 1978, Mason, 1983,
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