The Echiura, or spoon worms, are a small group of marine animals. Once treated as a separate phylum, they are now considered to belong to Annelida. Annelids...

oligochaetes as a sub-group of polychaetes. In addition, the Pogonophora, Echiura and Sipuncula, previously regarded as separate phyla, are now regarded...

2014). "Swimming behavior of the spoon worm Urechis unicinctus (Annelida, Echiura)". Zoology. 117 (3): 216–223. Bibcode:2014Zool..117..216A. doi:10.1016/j...

Kenneth M (5 April 2007). "Annelid phylogeny and the status of Sipuncula and Echiura". BMC Evolutionary Biology. 7 (1): 57. Bibcode:2007BMCEE...7...57S. doi:10...

high as 58,000 per square meter (5,390 per square foot). Together with Echiura and Sipuncula, they were once placed in the taxon Gephyrea, but consistent...

List of annelid families describes the taxa relationships in the phylum Annelida, which contains more than 17,000 extant species including ragworms, earthworms...

innkeeper" or "penis fish") is a family of spoonworms in the subclass Echiura. The only genus in the family is Urechis, which has four species. The World...

Patrick J.; Boukal, David S. (2005). "Sex determination in Bonellia viridis (Echiura: Bonelliidae): population dynamics and evolution" (PDF). Oikos. 108 (3):...

Schembri, David S. Boukal (2005). Sex determination in Bonellia viridis (Echiura: Bonelliidae): population dynamics and evolution Archived 2005-04-11 at...

Examples of Pleistoannelida (clockwise from upper left corner): Sabellida, Echiura, Eunicida, Clitellata, Phyllodocida, Siboglinidae. Scientific classification...