Nemerteans

Some articles on nemerteans, nemertean:

Enopla - Evolution and Systematics
... The record of nemerteans is extremely sparse, as would be expected from a soft-bodied animal ... The Cambrian fossil, Amiskwia, has been interpreted as a nemertean based on its resemblance to some pelagic ribbon worms however, this interpretation is disputed by many paleontologists ... The enoplan nemerteans have been regarded as highly derived based on a more complicated muscle arrangement in the body wall and a more complex nervous system ...
Enopla - Feeding Ecology and Diet
... Nemerteans are common predators in a variety of habitats ... Free-living marine suctorial nemerteans appear to be food specialists feeding primarily on amphipods ... Very little is known about the ecology of pelagic nemerteans, including diet and feeding behavior ...
Nemertea - Ecological Significance
... Most nemerteans are marine animals that burrow in sediments, lurk in crevices between shells, stones or the holdfasts of algae or sessile animals ... A few nemerteans are scavengers, and these generally have good distance chemoreception ("smell") and are not selective about their prey ... Near San Francisco the nemertean Carcinonemertes errans has consumed about 55% of the total egg production of its host, the Dungeness crab Metacarcinus magister ...