Echiura - Wikipedia
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.
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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".
Spoonworm | Invertebrate Anatomy & Adaptations | Britannica
spoonworm, any member of the invertebrate phylum Echiura, also known as Echiuroidea, or Echiurida. Nearly all spoonworms are exclusively marine.
Spoon Worms: The Wonders Of Subclass Echiuroidea | Earth Life
2020年3月1日 · 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.
Phylum Echiura | Online Zoologists
2006年6月10日 · First described by Pallas in 1766 and placed in the genus Lumbricus. In the mid nineteenth century, echiurans, sipunculans, and priapulids were placed in the class Gephyrea ("a bridge") in Annelida, because they were thought to link annelids with holothurians.
Echiura - Simple English Wikipedia, the free encyclopedia
The Echiura, or spoon worms, are a small group of marine animals. They are often considered to be a group of annelids , although they lack the segmented structure found in other members of that group, and so may also be treated as a separate phylum.
Echiurans: Echiura - Encyclopedia.com
Echiurans (eh-key-YUR-enz) are sea creatures sometimes known as spoon worms or fat innkeepers. They have bilateral symmetry (bye-LAT-er-uhl SIH-muh-tree) and can only be divided into similar halves along one plane. Their sausage-shaped bodies are soft, unsegmented, and have two distinct regions, the proboscis and body trunk.
Urechis caupo Fisher and MacGinitie, 1928 - Walla Walla University
Urechis caupo, about 20 cm long, in an artificial burrow in Monterey Bay Aquarium. The head is to the top right. Description: Echiuroid worms are round, unsegmented worms that have two setae on the ventral side of the anterior end.
Phylum Echiura | Lesser Protostomes | The Diversity of Animal Life
Phylum Echiura (ek-ee-yur´a) (Gr. echis, viper, serpent, + oura tail, + ida, pl. suffix) consists of marine worms that burrow into mud or sand, live in empty snail shells or sand dollar tests, or rocky crevices.
Echiurans: Echiura - Physical Characteristics - Body, Proboscis, …
Echiurans (eh-key-YUR-enz) are sea creatures sometimes known as spoon worms or fat innkeepers. They have bilateral symmetry (bye-LAT-er-uhl SIH-muh-tree) and can only be divided into similar halves along one plane. Their sausage-shaped bodies are soft, unsegmented, and have two distinct regions, the proboscis and body trunk.
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