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Spionid worm

Scientific Name
Boccardia knoxi
Scientific Author
(Rainer, 1973)
Annelida: Polychaeta: Spionidae
Australian Native Species
Australian Native Species

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Diagnostic Images

Anterior end
Boccardia knox anterior segments, redrawn from Figure 4A of Rainer, S. F. (1973) Polydora and related genera (Polychaeta: Spionidae) from Otago waters. Journal the Royal Society of New Zealand, 3, 545-564
Robin Wilson (artist) Museums Victoria
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Diagnostic Images (5)
Other Images (1)
Diagnostic Notes
Prostomium tip bifurcation absent, or weakly notched. Occipital antenna absent. Caruncle extends to anterior chaetiger 4; separate mid-dorsal organ absent.  Colouration: Eyes present, one pair. Dorsal pigmentation pattern absent. Palp banding absent. White mid-body or posterior dorsal pigmentation absent. Other colouration includes weak white pigmentation on pygidium, traces of dusky brown pigment intersegmentally in ventral midbody, and light-reflecting surface granules on posterior dorsal surface. Branchiae, chaetae, and pygidium: Branchiae adjoining parapodia 2-4, then 6 and following; longest branchiae on chaetiger 10 or later; near body end branchiae absent. Anterior gut gizzard-like structure absent. Hooded hooks begin chaetiger 8; bifid, hook shaft constriction (manubrium) absent, anterior hooded hook main fang more or less oriented at right angles to the shaft with wide angle to apical tooth. Alternating capillaries adjacent hooded hooks absent; neurochaetal inferior chaetae below hooded hooks absent. Chaetiger one notochaetae present; notopodial lobe present. Chaetae of chaetiger 5 'upper' (or 'posterior') row falcate without ornamentation, 'lower' (or 'anterior') row are cupped (sub-terminal complete flange), with central point (flange incomplete). Superior notochaetae of chaetiger 5 absent. Inferior neurochaetae of chaetiger 5 present. Posterior notochaetal spines absent. Pygidium pad shaped. Pygidium small, not extending wider than last chaetigers. [following Read, 2004}
More Information
Specimen Contact
Robin Wilson
Wilson, R. & Dane, E.
12/06/2008 03:36 AEST
Last Updated
12/04/2011 15:13 AEST
Wilson, R. & Dane, E. (2008) Spionid worm (Boccardia knoxi) Updated on 4/12/2011 3:13:09 PM Available online: PaDIL -
Image Use
Free for use under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)