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Mudworm

Scientific Name
Polydora websteri
Scientific Author
Hartman, 1943
Taxonomy
Annelida: Polychaeta: Spionidae
Status
Exotic Species Establishment in Australia
Reliability
High
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Diagnostic Images (4)
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 3. Occipital antenna absent. Nuchal organ short, at most one segment long, or long, extending back more than one segment. Eyes present, 4. Palps simple, lacking basal sheath.


Dorsal branchiae present, first on chaetiger 7, absent from many median and posterior chaetigers (absent from posterior half). Dorsal branchiae continuous. 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 without notochaetae. Interparapodial pouches absent.

Chaetigers 2-4 similar, not strongly differentiated. Chaetiger 5 highly modified, enlarged and with specialised chaetae; with one type of modified spine present. Chaetiger 5: simple, curved or subdistally inflated spines absent; spines with subdistal tooth or flange present (flange present, tooth absent); pennoned spines, with strongly asymmetrical tips absent; spines with flattened or cup-shaped tip absent; spines with terminal or subterminal bristles absent. Chaetiger 5 companion chaetae present, limbate, not brush-tipped. 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 and main fang forming a prominent angle, about 90ยบ or more. Shaft of neuropodial hooded hooks with distinct constriction. Neuropodial sabre chaetae present, in ventral-most positions. Neuropodial spines present. Pygidium disc-like with dorsal notch.

More Information
Specimen Contact
Robin Wilson
Author
Wilson, R. & Dane, E.
Created
12/06/2008 02:48 AEST
Last Updated
13/06/2008 16:42 AEST
Citation
Wilson, R. & Dane, E. (2008) Mudworm (Polydora websteri) Updated on 6/13/2008 4:42:12 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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