Intertidal Monitoring of Hydroid-dominated Rockpools in Carmarthen Bay and Estuaries Special Areas of Conservation (SAC) 2004 dataset https://portal.medin.org.uk/portal/start.php?tpc=007_NRW_DS102004 Hydroid rockpools (LR.H) are, by definition, species poor in comparison to other rockpool biotopes within the UK. LR.H rockpools are shallow mixed substrata pools characterised by the hydroids Obelia longissima and Kirchenpaueria pinnata, ephemeral seaweeds such as Ulva sp. and Enteromorpha spp. and the common periwinkle Littorina littorea. The casts of the lugworm Arenicola marina and the sand mason worm Lanice conchilega can be found in sandier pools. Hydroid rockpools are also associated with mussel beds (SLR.MytX), with Mytilus edulis present in the pools. Barnacles (Semibalanus balanoides and Elminius modestus) and the keel worm Pomatoceros sp. may also be attached to the harder substrata. On the south side of the Burry Inlet, hydroid rockpools have been identified at Whiteford Point during Phase 1 biotope surveys carried out by the Countryside Council for Wales (CCW) in 2000. The rockpools are located at the tip of Whiteford Point, within the vicinity of a cast iron Victorian lighthouse, currently listed as an ancient monument. The purpose of this data capture was to map and assess the current extent and distribution of Hydroid rockpools within the Special Area of Conservation (SAC) and evaluate the possible ephemeral nature of Hydroid rockpools by assessing the species richness of the rockpools at Whiteford Point. 20081231