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Echiura

Line breaks: Echi|ura
Pronunciation: /ˌɛkɪˈjʊ(ə)rə
 
/

Definition of Echiura in English:

plural noun

Zoology
A small phylum of worm-like marine invertebrates that comprises the spoonworms.
Example sentences
  • They are found in many animal taxa including Ctenophora, Echiura, Sipuncula, Annelida Mollusca among others.
  • Rouse chose as terminal taxa for his analysis most of the accepted polychaete families, and in addition Clitellata, Rotifera, Platyhelminthes, Nemertea, Mollusca, Sipuncula, Echiura, and Entoprocta.
  • When the character scoring between these studies is compared, one finds no debate about character scoring for phyla such as Mollusca, Sipuncula, Echiura, and Entoprocta, all scored present for a prototroch.

Origin

modern Latin (earlier Echiuroidea), from Greek ekhis 'viper' + oura 'tail'.

Derivatives

echiuran

1
noun& adjective
Example sentences
  • I conclude that the molluscan and annelid crosses cannot be upheld as independent potential synapomorphies of molluscs/sipunculans and echiurans / annelids, respectively.
  • The plesiomorphic nature of myoepithelial organization of the body wall musculature is evident in adult annelids, echiurans, and sipunculids.
  • The body of an echiuran lacks annelid-type segmentation, but the distinctive free-swimming trochophore larval stages of echiurans and polychaetes are very similar.

echiuroid

2
Pronunciation: /ˈɛkɪjʊ(ə)ˌrɔɪd/
noun& adjective
Example sentences
  • The oxygen consumption of the echiuroid BoneUia viridis has been investigated by means of a continuous-flow polarographic respirometer.
  • Echiuroids also move by extending the proboscis, which takes hold of some fixed object, and, then contracting, draws the body forwards.

Definition of Echiura in:

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