BIOTIC

BIOTIC Species Information for Caecum armoricum
All Taxonomy Biology Distribution Reproduction

Researched by	Nicola White	Data supplied by	MarLIN
Refereed by	Dennis R. Seaward
Distribution and Habitat
Distribution in Britain & Ireland	Only recorded living from The Fleet, Dorset. One shell record from Connemara, W. Ireland (J.E. Phorson, per. comm..)
Global distribution	Shell records from the Black Sea, Mediterranean, Azores, Canary Isles and the Atlantic coast from Gibraltar to the Channel. The only other known live colony is from a site in the south Gibraltar Strait, N. Africa.
Biogeographic range	Not researched	Depth range	See additional information
Migratory	Non-migratory / Resident
Distribution Additional Information	Found in the mid to lower eulittoral within marine percolation. The fleet population occurs at depth within loose shingle of about 2 cm size, where sea water percolates and where soft flocculent silty material is present but leaving plenty space subject to gently flowing water. Molluscan associates are another small prosobranch Onoba aculeus and the bivalve Lasaea adansoni; in the pale variety pallida.

Substratum preferences	Gravel / shingle	Physiographic preferences	Isolated saline water (Lagoon)
Biological zone	Mid Eulittoral Lower Eulittoral	Wave exposure	Very Sheltered
Tidal stream strength/Water flow	Very Weak (negligible)	Salinity	Variable (18-40 psu)
Habitat Preferences Additional Information
Distribution References	Barnes, 1994, Seaward, 1987, Seaward, 1989, Hoeksema & Segers, 1993,