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Taxonomy
Euchoneira knoxi
Nomenclature
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Subfamily: SabellinaeGenus: Euchoneira
SUMMARY
Body length (crown excluded) ranging from 20 to 40 mm, width of the 2nd chaetiger 2.0 to 3.8 mm.
8 thoracic and 30 abdominal chaetigers of which 9 form the anal depression. Branchial lobes each with 16 fully developed radioles with palmate membrane developed for the ¾ of the length. Flanges present, radioles with filiform tip. One or two dorsal “pinnular appendages” on the dorsalmost radioles basally fused together and separated from the remaining pinnules. Basalmost pinnular appendage highly developed and thicker. Dorsal lips rounded, extending from the inner, dorsal margin of the branchial lobes and terminating just dorsal to mouth, without radiolar appendages. Ventral lips rounded, with up to 16 ventral radiolar appendages about the same length of the branchial crown. Posterior peristomial ring collar high, lightly decreasing in length dorsally as junction of crown and thorax, but with two deep and thick dorsal pouches leaving visible the peristomium. Anterior peristomial ring with two small c-shaped depression dorsally just above the pouches. Vascular coils not detected. Notopodial fascicle from first chaetigers bearing 35 elongate narrowly hooded chaetae arranged as C-shape; chaetigers 2-8 with a superior group of 10 elongate narrowly hooded chaetae and an inferior group with 25 broadly hooded elongated chaetae posteriorly 10 bayonet type anteriorly. About 40 neuropodial uncini per torus in chaetigers 2-8, with very long handle and small teeth of similar size over the main fang. Abdominal neuropodial fascicles with modified, elongate narrowly hooded chaetae. Notopodia with 45 avicular uncini, with main fang surmounted by rows of small teeth, breast well developed and rounded, handles present. Intratorus variation absent. Uncini of the anal depression slightly smaller.
Common name: fan worm