Spionidae is a family of marine worms within the Polychaeta. Spionids are selective deposit feeders that use their two grooved palps to locate prey. However, some spionids are capable of interface feeding, i.e. switching between deposit and suspension feeding.

See Spio arndti (Western Baltic Sea) and Spio symphyta (North Sea and perhaps Norwegian Sea). Spio 'filicornis' elsewhere may be other species although quite similar in appearance.

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On the identity of Spio filicornis (O.F. Muller, 1776)—with the designation of a neotype, and the description of two new species from the North East Atlantic Ocean based on morphological and genetic studies.

Spio filicornis is a small bristleworm up to 3 cm long. Its body is divided into between 80 and 90 segments. Spio filicornis has a short, stout, pointed prostomium with short palps. It is pink in colour, with a brown gut and cream flecks laterally. Spio filicornis is found on most British coasts.

Scolelepis squamata is a species of polychaete worm in the family Spionidae. It occurs on the lower shore of coasts on either side of the Atlantic Ocean. Scolelepis squamata is a slender, bluish-green worm with a maximum length of about 14 cm (5.5 in) and over two hundred segments when fully grown.

Spio filicornis is a small bristleworm up to 3 cm long. Its body is divided into between 80 and 90 segments. Spio filicornis has a short, stout, pointed prostomium with short palps. It is pink in colour, with a brown gut and cream flecks laterally.

Spionidae (Spionids) is a family of segmented worms. They are upward conveyors. They have parental care and asexual reproduction. Reproduction is gonochoristic. They are facultatively mobile animals.

Subspecies Spio martinensis pacifica Berkeley, 1927 accepted as Spio filicornis pacifica Berkeley, 1936 (superseded original combination) Environment marine, brackish , fresh , terrestrial

Spio aequalis is a species of polychaete worm from New Zealand. [2] Little is known about the species, which is classified as nationally endangered. [3] Spio aequalis was first collected by Hugo Schauinsland in 1897 and named by Ernst Ehlers in 1904.