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) peachi Bowerbank (1882) is a very thinly encrusting yellow smooth sponge, growing on undersides of stones or on shells. It has apparently a wide distribution between the north of the British Isles and the Mediterranean.

Taxonomic Description

Colour: Yellow, orange or sometimes maroon.
Shape, size, surface and consistency: Very thinly encrusting, with smooth or minutely hispid surface. Size up to several cm2. No obvious oscules. Consistency soft.
Spicules: (Hymedesmia peachi spics) Megascleres: Ectosomal tornotes slender, straight, with bluntly oxeote ends: 169-248 x 3 µm; acanthostyles not easily divisible into two categories, spined for the greater part of their length, but smooth in the distal portion, spining particularly strong near the base: 68-395 x 12-22 µm. Microscleres: Arcuate isochelae, variable in shape, probably divisible in two size categories: 14-20 and 24-38 µm.
Skeleton: Irregular, but presumably hymedesmoid with long acanthostyles erect on the substrate; tornotes in bundles.
Ecology: In sciaphilous biotopes, under stones, in caves, 5-20 m.
Distribution: Northern England, Roscoff, Mediterranean.
Etymology: Named after the collector of the type specimen, Mr Peach of Scotland.
Type specimen information: The type is in the Natural History Museum, London.

Remarks

The species differs from similar Hymedesmia spp. in the possession of two size categories of microscleres.
Source: Boury-Esnault, 1971

Hymedesmia peachi