Invertebrates Unit 2 Kingdom Animalia.

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Presentation transcript:

Invertebrates Unit 2 Kingdom Animalia

Developmental trends for invertebrates: As we move through the phylum's we go from simple to complex The simplest organisms have asymmetry. As complexity increases, we go to radial and finally bilateral symmetry Organisms go from having no cavity (acoelomates) to a false cavity (pseudocoelomates), to a true cavity (eucoelomates).

3. Simpler organisms may reproduce sexually and asexually 3. Simpler organisms may reproduce sexually and asexually. As complexity increases, they can only reproduce sexually. 4. Simpler organisms have 2 tissue layers, more complex have 3 tissue layers. 5. They go from sessile to motile. 6. Simpler organisms have no tissues or systems. As complexity increases, the more systems an organism has.

Phylum Porifera Symmetry: Asymmetrical Coelom: none Digestion: none Reproduction: - asexual/sexual - external fertilization - hermaphrodites (both male & female parts) Example: Sponge

Phylum Cnidarians (Coelenterata) Symmetry: radial Coelom: none Digestion: one opening (food enters & wastes are removed from this opening ;called two-way) Reproduction: - asexual/sexual - external fertilization - hermaphrodites and separate sexes Example: jellyfish, hydra

Phylum Platyhelminthes Symmetry: bilateral Coelom: none Digestion: one opening, two way flow Reproduction: - asexual/sexual - internal fertilization - hermaphrodites and separate sexes Example: Planaria, tapeworm

Phylum Nematoda Symmetry: bilateral Coelom: present Digestion: two openings, One-way flow (mouth to anus) Reproduction: - sexual - internal fertilization - separate sexes, few hermaphrodites Example: hookworm, pinworm

Phylum Annelida Symmetry: bilateral Coelom: present Digestion: two openings, One-way flow (mouth to anus) Reproduction: - sexual - internal fertilization -hermaphrodites and separate sexes Example: Earthworm, leech

Phylum Mollusca Symmetry: bilateral Coelom: present Digestion: two openings, One-way flow (mouth to anus) Reproduction: - sexual - external & internal fertilization -hermaphrodites and separate sexes Examples: clams, squids, snails

Phylum Arthropoda Symmetry: bilateral Coelom: present Digestion: two openings, One-way flow (mouth to anus) Reproduction: - sexual - internal fertilization - separate sexes, few hermaphrodites Example: spiders, insects, lobster

Phylum Echinodermata Symmetry: bilateral Coelom: present Digestion: two openings, One-way flow (mouth to anus) Reproduction: - sexual (some asexual) - external fertilization - separate sexes, few hermaphrodites Example: Starfish, sea urchin, sand dollar