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
Distribution map
Links to other Web sites

Huth, 1934

Description:
Body small and thin.
Prostomium rounded, without eyes. A pair of finger-shaped antennae and a pair of minute palps. Peristomium and apodous segment have a small intersegmental ring between them. Prostomium, peristomium and each segment with a complete ring of cilia.
Parapodium with oval lobe and one acicula. Dorsal and ventral cirri absent. Chaetae of four kinds: 1) 1-2 simple finely toothed pointed chaetae; 2) 1-2 simple, sub-distally flattened, smooth hooks; 3) 2-4 compound chaetae with long or short smooth hooked blades; 4) 1-2 simple smooth hooks (O. gracilis-parapodium).
A pair of short finger-shaped pygidial cirri.
Mandibles X-shaped, with anterior margins toothed, subequally V-shaped. Maxillary carriers fused to each other and to hooked basal maxillae; basal maxillae each with 7-8 teeth along the cutting edge and serrations between the teeth. Seven pairs of toothed plates (maxillae) (O. gracilis-jaw plates).

Size:
Up to 4 mm for 27 chaetigers.

Colour:
White.

Habitat:
Interstitially in sand, gravel, and fragments of shells and of Corallina , from intertidal zone to shallow subtidal depths.

Distribution:
North Sea and English Channel (Roscoff).

Ophryotrocha gracilis