首页|NOTES ON THE IDENTITY AND ECOLOGY OF ROCELLARIA DUBIA (BIVALVIA: GASTROCHAENIDAE)
NOTES ON THE IDENTITY AND ECOLOGY OF ROCELLARIA DUBIA (BIVALVIA: GASTROCHAENIDAE)
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NSTL
Rocellaria dubia is under-recorded in the British Isles due to its habit of boring into hard substrata leaving only its siphons showing. The calcareous siphonal tubes which cover the siphons persist for a considerable time and can be used to identify R. dubia with a high degree of certainty. This paper provides descriptions and images of its siphonal tubes intended to assist with the correct indentification of further records of this cryptic species. In the British Isles R. dubia siphonal tubes are colonised by a wide range of epibionts and the use of SACFOR abundance recording (for an animal of 1-3cm) based on the siphonal tubes is tenable. In the British Isles R. dubia appears restricted to calcareous substrata including carbonate-cemented sand-and mud-stones and is an important eroder of these. It is highly tolerant of sediment veneers. Open bivalve bores under fine sediment veneers offer microhabitats to small sediment infauna by harbouring pockets of deeper sediment less subject to periodic 'clearance' than the surrounding sediment. The importance of biogenic erosion by R. dubia and other borers on subtidal rock exposures may be significantly under-estimated at the time of writing.
NSTL
