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The head is compact and lacks appendages. Some species are iridescent.
They burrow head downwards in sand or mud. The prostomium is usually conical,
and a distal palpode is present in some taxa. The peristomium is reduced
and fused with the prostomium or forms a distinct ring. Antennae and palps
are absent. The nuchal organs are paired and eversible. The longitudinal
muscles are grouped in bundles, and segmentation is usually not distinct.
The first segment is similar to subsequent segments, and all parapodia are
similar. Both parapodial rami are small, and in most taxa the notopodium
is slightly smaller than the neuropodium, but in Travisia, both rami
are well developed and large. The branchiae are single filaments closely
associated with the notopodium. Dorsal and ventral cirri and epidermal papillae
are lacking. The pygidium is either hoodshaped without internal and marginal
cirri or hoodless with multiple cirri. Lateral organs are present, but dorsal
cirrus organs have not been observed. The buccal organ is axial and simple,
and has a sac-like eversible proboscis.
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