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Archway, The North Wall, Rathlin Island

Survey number: 780 Event number: 20240520/01 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.

[Video]

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
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