IUCN threat status:

Not evaluated

Comprehensive Description

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Description

Prostomium blunt, anteriorly truncate or rounded, anterior margin bifid, with anterior margin indented (deeply). Lateral horns absent. Caruncle present, continuing back to chaetiger 6. Occipital antenna present. Nuchal organ short, at most one segment long. Eyes present; 4 eyes. Palps simple, lacking basal sheath. Dorsal ridge connecting bases of branchiae on chaetiger 1 absent. Prominent dorsal collar on setiger 2 absent. Dorsal branchiae present, first present on chaetiger 7. Dorsal branchiae absent from many median and posterior chaetigers, last present on chaetiger 22. Dorsal branchiae continuous. Dorsal branchiae free and separate from notopodial lamellae throughout, all simple. First branchiae without process at base on anterior face. Accessory branchiae arising from posterior part of notopodium absent. Ventral branchiae absent. Chaetiger 3 without filament at base of branchiae. Dorsal crests absent. Ventral crests absent. Chaetiger 1 notopodium present. Chaetiger 1 notochaetae absent. Neuropodial lobe of chaetiger 2 rounded, approximately symmetrical. Neuropodial lobes of posterior chaetigers a single lobe. Interparapodial pouches absent. Chaetigers 2–4 similar, not strongly differentiated. Chaetiger 5 slightly modified, not enlarged, but with specialised chaetae, with two types of modified spine present; simple, curved or subdistally inflated spines present; spines with subdistal tooth or flange absent; pennoned spines, with strongly asymmetrical tips present; spines with flattened or cup-shaped tip absent; spines with terminal or subterminal bristles present; companion chaetae absent. Posterior modified notochaetae absent. Notopodial hooded hooks absent. Neurochaetae of chaetiger 1 simple capillaries similar to those of subsequent chaetigers. Neuropodial hooded hooks present, first present on chaetiger 7–8. Neuropodial hooded hooks with accessory tooth or teeth above the main fang, 1 accessory tooth (bidentate), secondary tooth closely applied to the main fang, about 45º. Shaft of neuropodial hooded hooks with distinct constriction. Neuropodial sabre chaetae absent. Neuropodial spines absent. Embedded bunches of notopodial needle chaetae absent. Pygidium 2 semicircular valves.

Description generated from: Wilson, RS & McDiarmid, H 2013. Spionidae (Polychaeta)- A DELTA database of genera, and Australian species. Version 2; originally published as In RS Wilson, PA Hutchings & CJ Glasby (eds) Polychaetes: An Interactive Identification Guide. CSIRO Publishing, Melbourne.

Additional references:
Hartmann-Schröder, G. 1981. Zur Kenntnis des Eulitorals der australischen Küsten unter besonderer Berücksichtigung der Polychaeten und Ostracoden. Teil 6. Die Polychaeten der tropisch-subtropischen Westküste Australiens (zwischen Exmouth im Norden und Cervantes im Süden). Berucksichtigung der polychaeten und ostracoden. Mitteilungen aus dem Zoologischen Institut und Zoologische Museum der Universität Hamburg 78, 19-96.
Hutchings, PA and Turvey, SP. 1984. The Spionidae of South Australia (Annelida: Polychaeta). Transactions of the Royal Society of South Australia 108, 1-20.

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© Wilson, Robin

Source: Annelida LifeDesk

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