Nemertean

Some articles on nemertean, nemerteans:

Nemertea - Evolutionary History - Family Tree - Relationships With Other Phyla
... English-language writings have conventionally treated nemertean as "primitive" acoelomate bilaterians that are most closely related to flatworms (Platyhelminthes) ... Rigorous comparisons show no synapomorphies of nemertean and platyhelminth nephridia ... According to more recent analyses, in the development of nemertean embryos, ectomesoderm (outer part of the mesoderm, which is the layer in which most of the internal organs are built) is ...
Nemertea - Evolutionary History - Fossil Record
... fossil Amiskwia from the Burgess Shale has been classed as a nemertean, based on a resemblance to some unusual deep-sea swimming nemerteans, but few paleontologists accept this ... planus from the early Cambrian Maotianshan Shale resembles some planktonic nemerteans ... of a proboscis, and has spine-like protective structures and stalked eyes, which no known nemertean has ...
Enopla - Significance To Humans
... There is very little direct significance of nemertean worms to humans ... parasites of commercially important species of crustaceans, but the overall economic effect of nemertean parasites is small ... Also, many nemerteans produce toxins of which some are nicotinic agonists ...