Home|Search|Identify|Taxonomic tree|Quiz|About this site|Feedback
Developed by ETI BioInformatics
Characteristics, distribution and ecology
Taxonomische classification
Synonyms and common names
Literature references
Images, audio and video
Links to other Web sites

(Esper, 1794)

Species Overview

Axinella verrucosa (Esper, 1794) is an erect-branching sponge with anastomosed cylindrical branches, very variable in form. It was originally described from the Mediterranean, but subsequently reported from Roscoff.

Taxonomic Description

Colour: Ochre yellow.
Shape, size, surface and consistency: Arborescent (Spongia verrucosa), quite variable in shape (Axinella verrucosa Pansini), occasionally club-shaped, with cylindrical branches. Surface grooved and hispid (Axinella verrucosa Vos). Size up to 10 cm high, branches up to 1 cm in diameter. Consistency stiffly spongy.
Spicules: (Axinella verrucosa spics) Oxeas and styles. Styles, often modified to tylostyles: 520-900 µm. Oxeas are generally curved, but bent and even flexuous ones do occur. Stepped ends are very frequent and transformation to strongyles occur; occasionally there are centrotylotes: 450-730 x 7-17 µm.
Skeleton: Axially condensed with oxeas concentrated in the axial skeleton.
Ecology: On cliffs and on pebble bottom, 10-74 m
Distribution: Roscoff; Mediterranean.
Etymology: The name refers to the irregular surface.
Type specimen information: Type probably lost.


This species may be confused with Axinella damicornis. The following table (from Ackers et al., 1992) may help to focus on differentiating characters: A. verrucosa & A. damicornis.
Source: Pansini, 1983.

Axinella verrucosa