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Chapter 33 Notes Invertebrates. Concept 33.1 Phylum porifera: - asymmetric - ex. sponges - sessile adults, larva may swim - have no nerves or muscles;

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Presentation on theme: "Chapter 33 Notes Invertebrates. Concept 33.1 Phylum porifera: - asymmetric - ex. sponges - sessile adults, larva may swim - have no nerves or muscles;"— Presentation transcript:

1 Chapter 33 Notes Invertebrates

2 Concept 33.1 Phylum porifera: - asymmetric - ex. sponges - sessile adults, larva may swim - have no nerves or muscles; individual cells can sense and react to environmental changes

3 Concept filter-feeders; choanocytes, or collar cells, ingest food filtered through the sponge - most are hermaphrodites

4 Concept 33.1

5

6 Concept 33.2 Phylum Cnidaria: - radial symmetry - ex. jellyfish, hydra, sea anemones, coral - have stinging cells called nematocysts or cnidocysts; eject a barbed thread - contain a gastrovascular cavity; single opening

7 Concept 33.2

8 - sessile forms are called polyp; free- floating are called medusa - diploblastic (epidermis and gastrodermis); between layers is the mesogloea

9 Concept 33.2

10

11

12 There are 3 classes of Cnidarians: Hydrozoa: - ex. hydra, Portuguese man-of-war - most marine - both polyp and medusa stages; polyp is often colonial

13 Concept 33.2 Scyphozoa: - ex. jellies - all marine - polyp stage is reduced - free-swimming

14 Concept 33.2

15 Anthozoa: - ex. sea anemones, coral - all marine - medusa stage absent - sessile

16 Concept 33.2

17 Phylum Ctenophora: - means “comb-bearer” for the eight rows of fused cilia - ex. comb jellies - tentacles contain colloblasts to capture prey

18 Concept 33.3 Phylum Platyhelminthes: - ex. Flatworms, flukes, tapeworms - bilateral symmetry - unsegmented - triploblastic; acoelomates (no body cavity)

19 Concept 33.3 Class Turbellaria: - flatworms - free-living - rely on diffusion for movement of food, oxygen, and waste - asexual and sexual reproduction; can regenerate lost parts

20 Concept 33.3

21

22 Class Trematoda: - ex. blood flukes, liver flukes - all parasitic: feed on veins/organs of host - hermaphroditic

23 Concept 33.3 Class Cestoidea: - ex. tapeworms - all are parasites - attach to intestinal wall with scolex and absorb food from host

24 Concept 33.3

25 Phylum Rotifera: - psuedocoelomates - freshwater - complete digestive tract - fluid in psuedocoelom acts as a hydrostatic skeleton

26 Concept 33.3

27 Phylum Nematoda: - ex. roundworms - complete digestive system and closed circulatory system: blood is contained in vessels - decomposers and parasites

28 Concept 33.4 Phylum Mollusca: - ex. snails, slugs, clams, squids, octopuses - body consists of three parts: foot, visceral mass, mantle - open circulatory system - gas exchange is via gills, lungs, or the body surface (diffusion)

29 Concept 33.4

30 Class Polyplacophora: - ex. chitons - use foot to cling to rocks - simple nervous system and sense organs

31 Concept 33.4

32 Class Gastropoda: - “stomach-foot” - ex. snails and slugs - torsion: uneven growth in the visceral mass; rotates 180 degrees - exchange gases via gills; use mantle cavity

33 Concept 33.4

34 Class Bivalvia: - “hatchet-foot” - ex. clams, oysters, mussels - foot used for motility or anchorage - suspension feeders - no distinct head

35 Concept 33.4

36 Class Cephalopoda: - “head-foot” - ex. squid and octopus - carnivores; beak-like jaw to crush prey - have chromatophores to allow them to change colors - shell is reduced or absent

37 Concept 33.4

38 Concept 33.5 Phylum Annelida: - ex. earthworms, leeches - all are segmented - setae project from cuticle - closed circulatory system; aortic arches

39 Concept developed nervous system with two ventral, solid nerve cords and cerebral ganglia - complete digestive system: mouth- crop-gizzard-intestine-anus - sexual and asexual reproduction - tactile organs, chemoreceptors, balance receptors, and photoreceptors

40 Concept 33.5

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42 Class Oligochaeta: - ex. earthworm - all have setae - help aerate soil and cycle nutrients

43 Concept 33.5 Class Hirudinea: - ex. leeches - mostly freshwater - either carnivorous or parasitic

44 Protosomia Class Polychaeta: - primarily marine - parapodia with bristles; can be used for locomotion and gas exchange - largest class

45 Protosomia


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