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Paralacydoniidae
The prostomium tapers to a blunt tip and bears a pair of terminal anterior antennae and a pair of ventral palps; the antennae and palps are of a similar size. Irregular scattered brown pigment spots are present on the prostomium and dorsum; eyes are apparently absent. The pharynx has a terminal ring of papillae; jaws are absent. The peristomium, reduced dorsally, is present ventrally as lips around the buccal opening; it lacks cirri or other appendages. The first segment has neuropodia with neurochaetae and reduced ventral cirri; notopodia and notochaetae are lacking. All other segments are biramous, with widely separated parapodial lobes. Notopodia and neuropodia have small postchaetal and larger prechaetal lobes, and small dorsal and ventral cirri, respectively. Neuropodia are longer than notopodia. Aciculae are present in both parapodial lobes. Notochaetae are capillaries, serrated on one margin, and neurochaetae are compound spinigers similarly serrated. The pygidium is bulbous and has a pair of long cirri. The above description is taken from Wilson (2000), which is based on Rouse & Fauchald (1997) together with original observations an Australian specimen. Recognising the family Distinguishing species
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