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fan worm

Scientific Name
Myxicola infundibulum
Scientific Author
(Renier, 1804)
Taxonomy
Annelida: Polychaeta: Sabellidae

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Feeding tentacles

Diagnostic Notes

Gelatinous tube.

 

Branchial lobes fused dorsally. Radioles numerous, usually more than 8 pairs and increasing with size of worm. Palmate membrane present. Radiolar flange radiolar flange not forming expanded rounded flanges at tips of radioles. Present. Paired stylodes absent. Radiolar eyes absent. Anterior margin of peristomial ring unmodified, of low, even height all around. Narrow, about as long as wide. Distal end entire. Posterior peristomial ring collar absent or vestigial. Dorsal lips with dorsal radiolar appendages. Lacking dorsal pinnular appendages.

 

Glandular girdle on chaetiger 2 absent.  Anal depression absent.

 

Notochaetae of chaetiger 1 comprise a bundle of 2 rows similar to remaining thoracic notochaetae. Superior thoracic notochaetae elongate, narrowly hooded. Inferior thoracic notochaetae, anterior row (chaetiger 4) absent. Inferior thoracic notochaetae, posterior row (chaetiger 4) absent. Teeth of thoracic uncini equal in size in series above main fang. Breast poorly developed, chaeta acicular in appearance (perhaps with a small swelling proximal to the main fang). Handle very long, at least 4 times length of neck of uncinus. Thoracic neuropodial companion chaetae absent. Abdominal uncini almost entirely encircle each segment. Abdominal notopodial uncini with a distinct main fang and several smaller teeth above. Breast well developed. Handle absent. Anterior abdominal neurochaetae, posterior row absent. Posterior abdominal neurochaetae, anterior row elongate, narrowly hooded.


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