Pectinares

Pectinares, commonly referred to as pectinariids or cone worms, are a group of marine polychaete annelids known for living in and building from sediment. In modern classifications they are placed as an order, Pectinariida, within the class Polychaeta, though historical systems have varied in placement among related sedentary worms. The most distinctive feature of pectinares is their habit of constructing and inhabiting slender, cone- or trumpet-shaped tubes made from sand grains held together with mucus and other secretions.

These worms are benthic and occupy soft substrates such as mud, silt, and sand across a wide range of depths, from shallow coastal waters to continental shelves. The tube is typically anchored within the sediment, with the worm residing near or at the narrow end and extending its anterior region to feed. The tube’s structure provides camouflage and protection while allowing the worm to reach water flow over the feeding region.

Feeding in pectinares is generally associated with sediment and suspended particles. They are often described as deposit- and particle-feeders, using ciliary action and their tube-enclosed water flow to capture fine organic matter from the surrounding environment. This feeding strategy, combined with their tube-building lifestyle, makes them important contributors to bioturbation and sediment aeration in their habitats.

Reproduction and development in pectinares follow typical polychaete patterns, with external fertilization in many species and larval stages that may include trochophore forms. Their distribution is cosmopolitan, with species known from temperate to tropical seas, reflecting their adaptability to different soft-substrate environments.