Welcome to The Stylet!
Acoela and Nemertodermatida are marine worms that occur abundantly among sandy/silty sediments and algae. Most of the species are meiofauna (a mixed assemblage of small animals that will pass through a 250 µm sieve). Currently there are about 400 named species of Acoela and 9 species of Nemertodermatida. A number of phylogenetic studies have shown that acoels and nemertodermatids are not part of Platyhelminthes as previously thought, making their position within the animal tree of life contentious. Most recent studies indicate that they form early branches within Bilateria, which would make them pivotal to understanding the emergence of complex animals.
The purpose of The Stylet is to provide comprehensive data on taxonomy, distributions, specimens, literature and original images regarding acoels and nemertodermatids. Specimens are maintained by the Jondelius Lab at the Swedish Museum of Natural History and also posted here. Welcome!