Animals 2

2. unique is a crown of cilia at the head end helping it swim
5. mating and transferring sperm with each other.
9. one of the segments of a tapeworm, where eggs are produced.
12. Intestinal parasites of vertebrates. Attach to intestinal wall with hooks, suckers or both.
15. a type of larva with ciliated epidermal cells.
17. produced in gonads, which Obelia releases by rupturing.
20. probably the most famous cnidarians: they include the corals that build great reefs in tropical waters.
21. the sexual stage of the life cycle of the obelia
22. Four Classes: gastropods, chitons, bivalves and cephalopods. seashells
24. – slow moving grazers. Dorsal shell divided into 8 plates.

1. simplest animal with a complete digestive system
3. about 15,000 species.3 main types: turbellarians, flukes and __________
4. (branched tube regulating water)
5. skeleton: a fluid filled cavity against which contractile cells can act
6. (thrive in nearly all environments)
7. Highly active predators of the seas. Includes squids, swiftest invertebrate, Giant squid largest invertebrate, Octopus -Smartest Invertebrate.
8. does not have much of a head, but its foot is large and specialized for burrowing.
10. (stomach foot) – foot spreads out as they crawl. Largest class of mollusks
11. an association of 1 or more kinds of tissues, arranged in proportions and patterns
13. (middle skin) primary tissue layer important in the evolution of all large complex animals as part of internal organs and protective body cover
14. unusual twist in the soft snail body, a process only occurring in gastropods.
16. tubular, prey piercing venom delivering device to paralyze prey.
18. segments galore, earthworms are among 15,000 bilateral, segmented animals. means “ringed form”, rings are actual a series of repeating body units.
19. (also called Portuguese man of war) stings with a toxin dangerous to fish, bathers, and fisherman. cnidarian,
23. Worms, Bilateral, soft bodied, predators that swallow or suck tissue fluids from small worms, mollusks and crustaceans.