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Place name : Archway, The North Wall, Rathlin Island. County : Antrim

Date : 2024-05-20 GPS : 55.30788,-6.26920. Depth : -15.0 to -35.0 m. [ View map ]

Site Description : Vertical limestone wall with archway on Rathlin's north wall. Upper circalittoral bedrock with Delesseria sanguinea, Alcyonium digitatum and Pachymatisma johnstonia.

Sea beech Delesseria sanguinea [00:00:31]; Dead men's fingers soft coral, Alcyonium digitatum [00:00:57]; circalittoral limestone, archway, diver's air bubbles coming through porous limestone archway [00:01:05]; Papillate sponge Sphaerotylus renoufi [00:01:28]; angular boulders [00:01:37]; archway [00:01:55]; yellow cluster anemone Parazoanthus axinellae [00:02:48]; pink sponge Tethyspira spinosa [00:03:58]; yellow sponge Spongosorites calcicola encrusted by the sponge Desmacella cf. annexa [00:04:19]; white cluster anemone Parazoanthus anguicomis [00:04:35]; yellow crumpled duster sponge 'Axinella' damicornis [00:08:33]; Bloody Henry starfish Henricia oculata [00:08:50]; Brown crab Cancer pagurus [00:09:43]; Forest kelp Laminaria hyperborea [00:10:49].

Biotope 1 : Circalittoral limestone, archway

PORIFERA
Aplysilla sulfurea R
Pachymatisma johnstonia C
Axinella infundibuliformis F
Raspailia ramosa R
Tethyspira spinosa R
Stelligera stuposa O
Polymastia boletiformis R
Sphaerotylus renoufi R
Iophon hyndmani F
Iophonopsis nigricans O
Hymedesmia paupertas O
Myxilla fimbriata R
Desmacella cf. annexa C
Spongosorites calcicola A
Haliclona urceolus O
Haliclona viscosa R
CNIDARIA
Tubularia indivisa O
Ectopleura larynx O
Halecium halecinum O
Tamarisca tamarisca R
Nemertesia antennina F
Nemertesia ramosa O
Schizotricha frutescens R
Aglaophenia tubulifera O
Alcyonium digitatum C
Alcyonium hibernicum F
Parazoanthus anguicomus C
Parazoanthus axinellae F
Actinothoe sphyrodeta F
Caryophyllia inornata O
Caryophyllia smithii F
CRUSTACEA
Cancer pagurus R
MOLLUSCA
Polycera faeroensis R
Antiopella cristata R
BRYOZOA
Caberea boryi O
ECHINODERMATA
Henricia oculata R
Asterias rubens R
Marthasterias glacialis R
Echinus esculentus R
TUNICATA
Aplidium nordmanni O
Dendrodoa grossularia O
Botryllus renierii R
PISCES
Ctenolabrus rupestris R
RHODOPHYTA
Rhodophyllis divaricata F
Delesseria sanguinea C

Biotope 2 : Lower circalittoral boulders on flat, silty bedrock. Boulders are large and angular.

CNIDARIA
Alcyonium digitatum C
Metridium senile R
Caryophyllia smithii F
BRYOZOA
Parasmittina trispinosa O

Biotope 3 : Upper circalittoral limestone bedrock at 25 m.

PORIFERA
Dercitus bucklandi R
MOLLUSCA
Edmundsella pedata R
RHODOPHYTA
Meredithia microphylla R
CHROMOPHYTA
Alaria esculenta R
Laminaria hyperborea C

Marine Biodiversity Data Portal NI