CNIDARIA : CONICA : SertulariidaeSEA ANEMONES AND HYDROIDS

Hydrallmania falcata (Linnaeus, 1758)


Hydrallmania falcata

Description: The main stem of this hydroid is rather slender and the feather-like side branches are arranged in a spiral. The hydrothecae are on the upper side of the pinnae. They are grouped together in tight clusters of 2-5 hydrothecae, and there is 1 cluster to each internode. Within each cluster the hydrothecae curve alternately outwards from the axis of the pinnae. The gonothecae are oval shaped and smooth, with a short neck. The rim of the aperture is smooth.

Habitat: A typical species of tide swept, sand-scoured sites, attached to stones, boulders, wrecks and bedrock.

Distribution: A common species all round the British Isles

Similar Species: This is a very distinctive species.

Key Identification Features:

Distribution Map: NBN map : National Biodiversity Network mapping facility, data for UK.

WoRMS: Species record : World Register of Marine Species.

iNaturalist: Species account : iNaturalist World Species Observations database



 Picton, B.E. & Morrow, C.C. (2016). Hydrallmania falcata (Linnaeus, 1758). [In] Encyclopedia of Marine Life of Britain and Ireland.
https://www.habitas.org.uk/marinelife/species.asp?item=D6530 Accessed on 2025-04-19

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