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Sipuncula

Line breaks: Si|pun¦cula
Pronunciation: /sʌɪˈpʌŋkjʊlə
 
/

Definition of Sipuncula in English:

plural noun

Zoology
A small phylum that comprises the peanut worms. Also called Sipunculida.
Example sentences
  • The phylum Sipuncula (acorn worms) has been considered allied to the molluscs on the basis of a pattern of cells in early spiral cleavage of the embryo, known as the molluscan cross.
  • Comparison of both the inferred amino acid sequences and the gene arrangements of a variety of diverse metazoan taxa reveals that the phylum Sipuncula is more closely related to Annelida than to Mollusca.

Origin

modern Latin (plural), from Sipunculus (genus name), based on a variant of Latin siphunculus 'small tube'.

Derivatives

sipunculan

1
noun& adjective
Example sentences
  • The position and composition of the cells suggests that they are homologous to the gliointerstitial cell system of molluscs, sipunculans, annelids echiurans.
  • In echiurans, sipunculans and in most polychaete annelids at least portions of the coelomic lining form the somatic and visceral musculature.
  • Although mollusks, annelids, brachiopods, and sipunculans are closely related, the relationships between them are not well resolved.

sipunculid

2
noun& adjective
Example sentences
  • The plesiomorphic nature of myoepithelial organization of the body wall musculature is evident in adult annelids, echiurans, and sipunculids.
  • At least for certain sipunculids, however, circular muscles are reportedly derived from the ectomesenchyme.

Definition of Sipuncula in:

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