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(Bowerbank, 1866)

Species Overview

Eurypon clavatum (Bowerbank, 1866) is a hispid, thin, yellow encrustation on pebbles and shells in deeper water off the west coasts of Britain and France.

Taxonomic Description

Colour: Bright yellow.
Shape, size, surface and consistency: Thinly encrusting on pebbles and shells. Size up to 2 cm in lateral expansion. Surface strongly hispid, hairy, due to projecting spicules. Oscules small and dispersed. Consistency soft.
Spicules: (Eurypon clavatum spics) Smooth long styles to tylostyles: up to 1500 x 18 µm; short thin styles: 500 x 3 µm; acanthostyles, of extremely variable length, the smaller entirely spined, the larger partly smooth: 65-600 µm.
Skeleton: Smooth styles erect on the substrate surrounded by acanthostyles; thin styles form bundles or bouquets at the surface where the shaft of the smooth styles pierce the surface membrane.
Ecology: On pebbles, bryozoans and Lophelia, from 45 m downwards to at least 1300 m.
Distribution: Shetlands, Roscoff, Iles de Glénan, SW Ireland, Norway.
Etymology: clavatus (Latin) = club-shaped, referring to the shape of the tylostyles.
Type specimen information: The holotype is in the Natural History Museum, London: BMNH 1877.5.21.1556
(including 2 unregistered BMNH slides made from type,
and MNHN DT942) – Shetland Is.


This species is close to Eurypon coronula in habit, colour and spicule sizes, but that species has peculiar whorls of spines on the acanthostyles.
Source: Arndt, 1935.

Eurypon clavatum