Spirorbis spirorbis is a small (3–4 mm) coiled polychaete that lives attached to seaweeds and eel grass in shallow saltwater.
They have a smooth, white, sinistral (left-handed) coiled shell encasing an orange body about 3 mm in length. The tube has a peripheral flange where it attaches to the substrate.
The worm has a short abdominal region and a slightly broader thorax terminating in ten stiff tentacles, used to filter food from the water. One of the tentacles is slightly larger than the rest and shaped like a saucer, which is used as an operculum. This seals the opening of the shell and serves to protect the worm from predators and desiccation when out of water.
It lives primarily on toothed wrack (Fucus serratus) and bladder wrack (Fucus vesiculosus), but is also found on the basal part of thongweed (Himanthalia elongata). Numerous individuals can be found on any one surface.
Spirorbis spirorbis are cross fertilising hermaphrodites, who brood their young in a tube attached to the worm inside the shell. The larvae are released at an advanced stage of development and spend just a few hours as free-living organisms before attaching themselves to the nearest suitable surface, often the same seaweed as the parent.
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Spirorbisspirorbis is a small (3–4 mm) coiled polychaete that lives attached to seaweeds and eel grass in shallow saltwater. They have a smooth, white...
p.76 Self- and cross-fertilization in Spirorbis borealis and S. pagenstecheri On the larval forms of Spirorbis borealis Observations on the Settling Behaviour...
Racosperma spirorbis and then transferred back to genus Acacia in 2006. There are two subspecies: Acacia spirorbis subsp. spirorbis Acacia spirorbis subsp...
Anisus spirorbis is a species of small freshwater air-breathing snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn...
Spirorbis corallinae is a very small (1-2 mm) coiled polychaete (bristle worm) that lives attached to seaweed in shallow saltwater. It has a smooth, white...
much paler, which occurs in deeper water. It differs from Spirorbisspirorbis in that S. spirorbis retains its eggs in the tube, while J. pagenstecheri incubates...
(Annelids) to which the genus Spirorbis belongs. This contradicts arguments made by Harold Coffin and other creationists that "Spirorbis" fossils within strata...
colonial organisms but provides a canopy and shelter for the tube worm Spirorbisspirorbis, herbivorous isopods such as Idotea and surface-grazing snails such...
polychaete annelid Spirorbis until studies of shell microstructure and formation showed significant differences. All pre-Cretaceous "Spirorbis" fossils are...
and herbaceous plants, and numerous vines climb into the trees. Acacia spirorbis is a characteristic tree, and the introduced tree Leucaena leucocephala...
coiled calcareous tubes cemented to algae and rock. Spirorbis. 8 species including Spirorbisspirorbis 1 species Class Aphanoneura Aeolosoma hemprichi Aeolosoma...
the rock crevice in which it is growing. Some valves are encrusted by Spirorbis worm tubes. In adulthood, the dorsal valve has a concave rim up to 1mm...
intertidal zone, usually associated with the Spirorbis tube worms they eat. V. felis feeds on Spirorbis tube worms in the intertidal zone. This species...
preserved in the names of local fossils, such as the ‘Lingula Lewisii,’ ‘Spirorbis Lewisii,’ and ‘Cephalapis Lewisii.’ Lewis also edited for the Camden Society...
Okadaiidae. This species occurs in New Zealand. This species feeds on Spirorbis tube worms.[1] Although Vayssierea cinnabarea is accepted as a separate...
rocks during low tide or floating on brown algae. This species feeds on Spirorbis or other tube worms. In Victoria it is usually found near its food source...
Tentaculita, a group of animals of uncertain affinities that were convergent on Spirorbis tube worms, were rare after the Triassic and had become reduced to the...
again. Anisus leucostoma may be a narrow-whorled morphotype of Anisus spirorbis. The shell of this species is about 8 mm in maximum dimension, usually...
Sea and in the Gulf of Mexico. Calcara P. (1841). Monografie dei generi Spirorbis e Succinea seguita da alcune nuove specie di conchiglie siciliane. Giornale...
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