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

Bowerbank, 1882

Species Overview

Hymedesmia (Hymedesmia) pilata Bowerbank (1882) is a very thinly encrusting, slightly hispid sponge recorded only once from the W coast of Ireland. Live colour is unknown. It stands out among other Hymedesmia species in the absence of chelae and the presence of sigmas (microscopic examination).

Taxonomic Description

Colour: Dark amber-brown in the dry state.
Shape, size, surface and consistency: Very thinly encrusting. Surface smooth or minutely hispid. Small dispersed oscules.
Spicules: (Hymedesmia pilata spics) (Hymedesmia pilata Burton) Megascleres: Ectosomal tornotes strongylote: 120 x 1.5 µm; acanthostyles in a large size range but not divisible in two categories, spines most pronounced at the base: 78-240 x 8-9 µm. Microscleres: Sigmas of two size categories: 15 µm and 30 µm.
Skeleton: Bundles of 2-3 tornotes or single tornotes and erect acanthostyles make up most of the skeleton; the surface carries large numbers of sigmas.
Ecology: No data.
Distribution: Recorded once form Birterbuy Bay, W coast of Ireland.
Etymology: pilatus (Latin) = densely hairy, referring to the skeleton.
Type specimen information: The type is in the Natural History Museum, London.

Remarks

This species is known only from a single specimen from the W coast of Ireland. The original description failed to mention the presence of strongylote tornotes. This led Lundbeck (1910) to conclude that pilata probably was an Eurypon; however, that genus does not have sigmas and belongs to a suborder (Microcionina) which is entirely devoid of sigmas. In most respects (except the lack of chelae) pilata corresponds to Hymedesmia.
Source: Burton, 1930b.

Hymedesmia pilata