Objective: Phylum Platyhelminthes, Nematoda.. Body Plan Bilateral Symmetry - Mirror image (left side mirrors right side)

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Presentation transcript:

Objective: Phylum Platyhelminthes, Nematoda.

Body Plan Bilateral Symmetry - Mirror image (left side mirrors right side)

Body Plan 3 Tissue Layers: Ectoderm: body covering Mesoderm: internal tissue (muscle) Endoderm: - Gastrovascular cavity or digestive tract

Body Cavities - Coelom- body cavity that holds organs Acoelomate: animal that lacks a fluid filled body cavity

Digestion -Gastrovascular cavity: food enters and exits through this muscular sac

Major Characteristics Movement: -Ventral cilia -Muscles Eyespots: detect light Nervous system: anterior clusters of nerve cells, side flaps for sense of smell

Class Turbellaria Example: Planarians (marine, freshwater), free- living

Class Trematoda Example -Blood fluke, parasites 5oXI

Class Cestoidea Description - Parasitic No digestive or circulatory system Absorb nutrients Ex: Tapeworm! s-inside-me-meter-long-tapeworm.html

Phylum Nematoda (Roundworms) Have bilateral symmetry and 3 tissue layers like flatworms Different from flatworms because they have: Complete Digestive Tract: - Opposite mouth and anus - Digestive tube

Body Plan Pseudocoelm: - fluid filled body cavity in direct contact with the digestive tract, worm thrashes to distribute nutrients

Diversity Most are free-living and decomposers Some are Parasites Ex: Heartworm s-inside-me-flesh-eating-hookworm.html s-inside-me-lymphatic-filariasis.html

Phylum Annelida (Annelids) aka Segmented Worms Body Plan -Divided into sections by internal walls- -Digestive tract, nerve cord, and main blood vessels not segmented Have bilateral symmetry and 3 tissue layers

Closed Circulatory System: Blood remains in vessels - nutrients, oxygen, and wastes diffuse

Coelm True, fluid filled body cavity in contact with internal tissues

Anatomy Pharynx: beginning of digestive tract Crop: stores food temporarily Gizzard: soil mixture is ground up Clitellum: flat area near anterior end Responsible for secreting mucus for mating and creating cocoons for offspring Setae: tiny hairs on ventral side for movement

Class Polychaeta

Class Oligochaeta Example: Earthworms

Class Hirudinea Example: Leeches