phylum nemertea (lophotrochozoan)

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Last updated 12:29 AM on 4/14/26
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19 Terms

1
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ribbon worms

or proboscis worms

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bottom

dwellers

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mostly carnivores some scavengers

worms, clams, crustaceans

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dangerous to fishing

attack clams and crabs

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almost

no known predators

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bilateral symmetry

very contractile

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soft and unsegmented

flattened tube

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eversible

proboscis in rhynchocoel

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proboscis

food capturing; pressure enables it to shoot out

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developed

digestive system

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sexual dimorphism

hermaphroditic

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external

fertilization

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excretory

tubules or protonephridida “nephrons”

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gas exchange

thru skin

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brain

4 ganglia

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longitudinal

nerve cords

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bran contains

hemoglobin (oxygen reserve)

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eyespots

present in pairs

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can undergo

regeneration and asexual repreo by fragmentation