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Spionid worm

Scientific Name
Boccardia chilensis
Scientific Author
Blake & Woodwick, 1971
Taxonomy
Annelida: Polychaeta: Spionidae
Status
Australian Native Species
Reliability
High
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Diagnostic Images (3)
Other Images (1)
Diagnostic Notes

Prostomium blunt, Anteriorly truncate or rounded; bifid, with anterior margin indented; without frontal or lateral horns. Posterior prolongation of prostomium continuing back to chaetiger 2-3 (to posterior end of chaetiger 2, with additional mid-dorsal swelling on chaetigers 5-8). Occipital antenna present. Eyes present. Palps simple, lacking basal sheath.

Dorsal branchiae present, first on chaetiger 2, continue to near posterior end of body (absent for at most posterior one-third of body). Dorsal branchiae interrupted, (absent) on chaetigers 5. Dorsal branchiae free and separate from notopodial lamellae throughout, all simple. Accessory branchiae arising from posterior part of notopodium absent. Ventral branchiae absent.

Dorsal crests absent. Chaetiger 1 with notochaetae.

Chaetigers 2-4 similar, not strongly differentiated. Chaetiger 5 highly modified, enlarged and with specialised chaetae; with two types of modified spine present. Chaetiger 5: simple, curved or subdistally inflated spines present; spines with subdistal tooth or flange absent; pennoned spines, with strongly asymmetrical tips absent; spines with flattened or cup-shaped tip present; spines with terminal or subterminal bristles present (but sparse and limited to margin of distal concavity). Chaetiger 5 companion chaetae absent. Posterior modified notochaetae present. Notopodial hooded hooks present. Neurochaetae of chaetiger 1 simple capillaries similar to those of subsequent chaetigers. Neuropodial hooded hooks absent; first on chaetiger 7; with accessory tooth or teeth above the main fang; with 1 accessory tooth (bidentate); secondary tooth closely applied to the main fang, about 45ยบ. Shaft of neuropodial hooded hooks of constant thickness, lacking a constriction. Neuropodial sabre chaetae present, in ventral-most positions. Neuropodial spines present. Pygidium a fleshy pad, weakly divided.

More Information
Specimen Contact
Robin Wilson
Author
Wilson, R. & Dane, E.
Created
12/06/2008 03:50 AEST
Last Updated
12/04/2011 15:12 AEST
Citation
Wilson, R. & Dane, E. (2008) Spionid worm (Boccardia chilensis) Updated on 4/12/2011 3:12:36 PM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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