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- W3150556495 abstract "Setae of the first segment of the marine annelid Sthenelais berkeleyi (family Sigalionidae) are arranged in the shape of an antero-dorsally directed tube. When the worm is in resting position buried in sediment, this setal tube projects slightly from the sediment surface. A current of water is drawn into it by cilia on the parapodia of the first segment. The water is then diverted to a pair of lateral spaces between the body wall and elytra, moved posteriorly in these spaces along the length of the body by segmental cilia, and eventually exits posteriorly or ventrally. This flow permits the worm to respire while remaining buried and immobile for long periods of time, waiting for prey to move over the sediment near it. Setae of the first segment are probably used as snorkels in some other infaunal sigalionids as well. Additional key words: annelid, polychaete, setae, Sigalionidae, Sthenelais The setae of annelid worms usually take the form of elongate cylinders of chitin and sclerotized proteins (Specht 1988). Despite this fundamental simplicity of form, they are diverse in function. Setae are important in a variety of locomotory modes, including crawling (Merz & Edwards 1998), burrowing (Clark 1964), swimming (Merz & Edwards 1998), and perhaps flotation (Schroeder & Hermans 1975). Short, hooked setae serve to anchor annelids in tubes or burrows (Woodin & Merz 1987) or on hosts. Setae are also deployed defensively in larvae (Pennington & Chia 1984) and adults (Fauchald 1977) of numerous species. Here I describe a previously unknown function of annelid setae. In Sthenelais berkeleyi PETTIBONE 1971 (family Sigalionidae), a group of anterior setae are arranged to form a tube that serves as an intake for respiratory currents. The setal snorkel permits this large scaleworm to live as a sit-and-wait predator in soft sediments. Many other sigalionids are similar to S. berkeleyi in morphology and habitat, and may also use setae to channel respiratory currents." @default.
- W3150556495 created "2021-04-13" @default.
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- W3150556495 date "2016-01-01" @default.
- W3150556495 modified "2023-09-27" @default.
- W3150556495 title "A scaleworm's setal snorkel" @default.
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