Summary
Spionida is an order of marine polychaete worms in the infraclass Canalipalpata. Spionids are cosmopolitan and live in soft substrates in the littoral or neritic zones.[1]
| Spionida | |
|---|---|
| |
| Magelona johnstoni with long feeding palps. | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Annelida |
| Clade: | Pleistoannelida |
| Clade: | Sedentaria |
| Infraclass: | Canalipalpata |
| Order: | Spionida
Families
Several, see text
Characteristics
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Spionids have a single pair of flexible feeding tentacles with grooves, arising directly from the prostomium. The mouth has no jaws and the pharynx is partly eversible. Some species have small eye spots and some a central sensory lobe. Some of the anterior segments paired gills. The parapodia or lateral lobes have large lamellae. The chaetae are unbranched capillaries, spines and hooks.[1][2] Families editAccording to the World Register of Marine Species (WoRMS), the Spionida comprises six families in a single suborder:[3]
Other families such as Aberrantidae and Magelonidae are sometimes included in Spionida.[5] References edit Wikimedia Commons has media related to Spionida.
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