• These unique parental care patterns within one family of extant freshwater leeches can be arranged schematically in a series of increasing complexity which may reflect the evolution of brooding behaviour. (springer.com)
  • The phylogenetic tree of the leeches and their annelid relatives is based on molecular analysis (1999) of mitochondrial cytochrome c oxidase . (wikipedia.org)
  • As with all blood- or haemolymph-feeding leeches, their saliva, contains anticoagulant compounds which are potentially useful in therapy of some cardiovascular diseases. (wikipedia.org)
  • The bloodletting and anticoagulant abilities of leeches have led them to be used medicinally in ancient India and Greece as well as in modern medicine. (blogspot.gr)
  • Glossiphoniid leeches of the genus Helobdella , which have a world-wide distribution, display the most highly developed parental care system: they not only protect but also feed the young they carry. (springer.com)
  • A second group (the jawless leeches or Rhyncobdellida ) insert a needle-like protrusion called a proboscis into the body of the host and secrete an enzyme, hemetin which dissolves clots once they have formed. (fashionistic.com)
  • In modern times, leeches find medical use in microsurgery , while hirudin is a valuable drug for some blood-clotting disorders. (wikipedia.org)
  • Coelome is a spacious cavity, except in leeches in which it is filled with botryoidal tissue. (biozoomer.com)
  • During development, leeches lose the segmenting walls of the coelom, the cavity fill up with spongy tissue, but ganglia remain segmented. (prezi.com)
  • We conclude that the major selective pressure driving the evolution of parental care in leeches may have been predation on eggs and juvenile stages. (springer.com)
  • As a fall in atmospheric pressure results in a small decrease in dissolved oxygen concentrations, rising leeches in a jar of water provided nineteenth century weather forecasters with a simple way of predicting bad weather. (fashionistic.com)
  • The bodies of all leeches are divided into the same number of segments (34), with a powerful clinging sucker at each end (although the anterior, or front sucker can be very small). (fashionistic.com)
  • In response to disturbances by an approaching host, the leech will commence "inchworm crawling", continuing in a trial and error way until the anterior sucker touches the host and attaches. (fashionistic.com)
  • Compared to their sister taxon, the Arhynchobdellida (proboscisless leeches), rhynchobdellid systematics has always been rather straightforward as regards the main clades contained therein. (wikipedia.org)