Sipuncula

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Noun1.Sipuncula - peanut worms
animal kingdom, Animalia, kingdom Animalia - taxonomic kingdom comprising all living or extinct animals
peanut worm, sipunculid - small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut
phylum - (biology) the major taxonomic group of animals and plants; contains classes
References in periodicals archive ?
Brachiopods, sipunculans, enteropneusts and metals from two estuarine tidal flats, Pacific, Costa Rica.
Schulze (2008): An updated checklist of the sipunculans (Phylum Sipuncula) of Cuba.
Historical overviews by Rouse (1999) and Nielsen (2004) identify Hatschek (1878) as the first to propose that a type of feeding trochophore found among extant polychaete annelids typified features of the ancestral larval form for annelids, molluscs, sipunculans, and echiurans.
Polar Filament-Formers in Tissues of Fish, Sipunculans, and Annelids)
Taylor also points out that predatory gastropods in eutrophic waters on continental shores tend to be generalist feeders on suspension-feeding barnacles and bivalves, whereas predatory gastropods in oligotrophic waters are more specialized feeders on algal-grazing polychaetes, sipunculans, or gastropods.
Most species were polychaetes but some hirudineans and sipunculans were also included; seven genera were proposed and 84 species were newly described.
however, sipunculans show a different, nonsegmental formation mode that cannot be explained by the existence of a posterior growth zone.
A group of 15 species included flatworms, nemerteans, two sipunculans, oligochaetes, two brachiopods, two echinoderms, hemichordates, a lancelet and a gobiid fish (Vargas 1989).
Teleplanic (long-lived) larvae are transported by currents across ocean basins (Hacker, 1898; Mortensen, 1898; Scheltema, 1968, 1988; Laursen, 1981) and have been reported in diverse taxa, including ranellid and architectonicid gastropods (Scheltema, 1966, 1971a, b, 1988; Laursen, 1981; Bieler, 1983; Scheltema and Williams, 1983), bivalves (Gofas, 2000; Scheltema and Williams, 1983), polychaetes (Scheltema, 1974; Murina, 1997), sipunculans (Scheltema and Rice, 1990; Staton and Rice, 1999), and spiny lobsters (Phillips et al.
The dominant non-colonial macro boring families at the study reefs are mytilid bivalves, eunicid polychaetes and aspidosiphonid sipunculans, with the bivalves considered the main internal bioeroders due to their greater body size and abundances.
Sipunculans are coelomate nonsegmented marine worms closely related to annelids; however, they lack a true circulatory system (Stephen and Edmonds, 1972; Maxmen et al.
1994), sipunculans (Rice, 1988), bivalves (Grassle et al.