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Lacydoniidae
Description
The prostomium is rounded or trapezoidal, and
has a pair of lateral antennae and a pair of short simple ventral
palps. The peristomium is reduced to lips. A
median dorsal antenna is present in some species. The
eversible muscular pharynx lacks jaws; terminal papillae are
present. The first segment is distinct and has two pairs of
small tentacular cirri. The parapodia are biramous, but the notopodia are always smaller than the
neuropodia. Small papilliform or flattened dorsal and ventral
cirri are present. Aciculae are present. Notochaetae are long
simple capillaries, and neurochaetae are compound spinigers.
The pygidium bears two pairs of pygidial cirri.
The above description is taken from Wilson (2000), which in turn is based on that of Fauchald & Rouse (1997).
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