• The freshwater or amphibious worm-leeches are carnivorous and equipped with a relatively large, toothless mouth to ingest insect larvae, molluscs, and other annelid worms, which are swallowed whole. (wikipedia.org)
  • The phylogenetic tree of the leeches and their annelid relatives is based on molecular analysis (1999) of mitochondrial cytochrome c oxidase . (wikipedia.org)
  • Here we show that D quadrant micromeres (2d and 4d) of the oligochaete annelid Tubifex tubifex are essential for embryonic axis formation. (biologists.org)
  • They are closely related to the oligochaetes , which include the earthworms , and like them have soft, muscular, segmented bodies that can lengthen and contract. (wikipedia.org)
  • Rhynchobdellida " ( paraphyletic , marked with a red bar on the diagram) are jawless leeches, armed with a muscular, straw-like proboscis puncturing organ in a retractable sheath. (wikipedia.org)
  • The pilidium exhibits a familiar relation between identified blastomeres and the primary ciliated band, but the manner in which these cells form this organ differs fundamentally from the way equivalent cells construct the trochophore's prototroch. (biomedcentral.com)