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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 typically have their bodies divided into segments, but echiurans have secondarily lost their segmentation.
Spoonworm, any member of the invertebrate phylum Echiura, also known as Echiuroidea, or Echiurida. Nearly all spoonworms are exclusively marine. They are sausage-shaped organisms with a flattened extension of the “head” that is curved along its lateral edges and sometimes shaped like a scoop or.
- The Editors of Encyclopaedia Britannica
1 mar 2020 · The echiuroidea (spoon worms), once known as the phylum Echiura, are small group of polychaete worms in the phylum Annelida. They occupy marine, or occasionally brackish ecosystems and mostly live in burrows in soft sediment.
Urechis unicinctus, known as the fat innkeeper worm or penis fish, is a species of marine spoon worm in East Asia. It is also known as garloid coloquially. It is found in Bohai Gulf of China and off the Korean and Hokkaido coasts.
In English, echiurans are referred to as "spoon worms" (when referred to at all). Although there are only about 150 species of echiurans known today, they are quite common in some marine environments. Urechis caupo, the "innkeeper worm" pictured here, is common in some mudflats of the Pacific coast of California.
Echiurans, also known as spoon worms, have a body divided in two distinct regions: a sausage-shaped saccular, nonsegmented trunk and a ribbon-like proboscis at the anterior end. The length of the trunk may range from 0.39 in (1 cm) up to >19.6 in (>50 cm) and may be gray, dark green, reddish brown, rose, or red.
Echiurans range widely in body length, color, and skin texture. They are characterized by a highly mobile, extendable proboscis (although it cannot retract into the body cavity), whose use in feeding gives them the common name "spoon worms".
