Spirorbis

Spirorbis is a genus of very small () polychaete worms, usually with a white coiled shell. Members of the genus live in the lower littoral and sublittoral zones of rocky shores. Spirorbis worms usually live attached to seaweeds, but some species live directly on rocks, shells or other hard substrates. Spirorbis was once thought to have a fossil record extending back into the Early Paleozoic, but now all pre-Bathonian (Middle Jurassic) spirorbins are known to be microconchids. The earliest members of genus appeared in the Miocene, but Oligocene finds may also be possible. The genus contains the following species: Spirorbis borealis Daudin, 1800 Spirorbis corallinae De Silva and Knight-jones, 1962 Spirorbis cuneatus Gee, 1964 Spirorbis granulatus Spirorbis incongruus Spirorbis inornatus L'hardy and Quievreux, 1962 Spirorbis knightjonesi Desilva, 1965 Spirorbis lineatus Spirorbis marioni (Caullery and Mesnil, 1897) Spirorbis medius Spirorbis moerchi Spirorbis nakamurai Spirorbis quadrangularis Spirorbis quasimilitaris Bailey, 1970 Spirorbis rupestris Gee and Knight-jones, 1962 Spirorbis semidentatus Spirorbis similis Spirorbis spirorbis (Linnaeus, 1758) Spirorbis steueri Sterzinger, 1909 Spirorbis tridentata Levinsen, 1883 Spirorbis variabilis Spirorbis violaceus

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