Known as ribbon worms or slime worms, Nemerteans are less than an inch long with flat, soft, slender bodies and are sometimes found crawling on plant debris under the water.
12.
Dwelling on or in seabed ooze and often smaller than an aspirin tablet, they include tiny slugs, snails, crabs, bristle worms, ribbon worms, lamp shells, tusk shells, sea anemones, brittle stars and sea cucumbers.
13.
The toxin is variously used by metazoans as a defensive biotoxin to ward off predation, or as both a defensive and predatory venom ( e . g ., in octopuses, chaetognaths, and ribbon worms ).
14.
"' Thomas Harrison Montgomery Jr . "'( March 5, 1873 March 19, 1912 ) was an American zoologist who made important contributions to cell biology especially in chromosomes and their roles in sex determination as well as the biology of birds and several groups invertebrates, naming many species of ribbon worms, rotifers, and spiders.
15.
When excluding internal parasites, free living species in terrestrial environments are represented by the following ten phyla : Flatworms ( Planarians ), Nemertea ( ribbon worms ), Nematoda ( roundworms ), Rotifers, Tardigrada ( water bears ), Onychophora ( velvet worms ), Arthropods, mollusks ( gastropods : land snails and slugs ), Annelida and Chordata ( tetrapods ).
