Abstract
Pectinariidae, the aptly named ‘ice-cream cone’ worm, are an anatomically complex, if relatively uniform group that is known worldwide. They mainly occur in shallow marine sediments and are immediately recognizable from their elegant cone or tusk-shaped tubes, constructed from a single layer of sand grains, forams, shell fragments, spicules, or other particles (Pl. 11d, Figs. 52.2a, b). Adult Pectinariidae range from 10 mm to 100 mm in length and do not have more than 20 chaetigerous segments. When removed from their tubes, living Pectinariidae are translucent, with the sediment-filled gut clearly visible. The branchiae may be bright red and the distinctive anterior paleae are golden (Pl. 11d, e).
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