Phylum Nemertea (Rhynchocoela)

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Late-stage Cerebratulus sp. Pilidium larvae Late-stage, side view Cerebratulus larva Cerebratulus larva Cerebratulus <strong>Nemertea</strong>n larva Side view of a pilidium, probably Lineus sp. Bamfield, B.C
Ecological Notes <strong>Nemertea</strong>ns are found in and among seaweeds, rocks, mussel and barnacle beds, or buried in mud, sand, or gravel substrates. Most are benthic and live in temperate areas, but some terrestrial and freshwater species. Few fully pelagic species, that drift or swim slowly in the open ocean. Some ribbon worms live in burrows that have been constructed from slime secreted from their mucus glands. They crawl, leaving a trail of slime similar to that of a gastropod mollusc. Other species use their extended proboscis like an anchor around the substrate, from which they ‘reel’ their bodies in. Alternative forms of locomotion include burrowing and anguilliform swimming. Some nemerteans actively track prey by following their chemical trails, - common prey items are polychaetes, snails, small crustaceans, and molluscs. A few are parasitic.
Page 1 and 2: Phylum Nemertea (Rhynchocoela) Gree
Page 3: Nemertean Bauplan “Functionally
Page 6 and 7: Feeding and digestion Proboscis is
Page 8 and 9: Comparison of Proboscis Types Credi
Page 10 and 11: Circulation and Gas Exchange Nemert
Page 12 and 13: Excretion and Osmoregulation 2 to 1
Page 14 and 15: Cerebral organs of nemerteans Most
Page 16 and 17: Epidermis Frontal gland Esophagus R
Page 18 and 19: Development Paleonemertea, Hoplonem
Page 22 and 23: Nemertean Taxonomy Nemerteans are c
Page 24 and 25: Are Nemerteans sister taxa with fla

Phylum Nemertea (Rhynchocoela)

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