The frequent presence of leeches with a hidden lifestyle in the mantle cavity of freshwater mussels has been recorded since the second half of the 19th century. Yet this was, until now, regarded as an accidental phenomenon. Recent research not only reveals seven mussel-associated leech species new to science, but also shows that their association evolved over millions of years.
Leeches - Blutegel "Holothuries". Zoologie. Echinodermes With anatomic details Watermark: Egypte Ancienne et Moderne Original antique print Copper etching, aquatinta of the absolute highest quality by Salvatore Tresca (1750-1815) Published in "Description de l'Egypte ou Recueil des observations et des recherches qui