Kingdom animalia
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Common Earth Worm. Kingdom Animalia. Phylum Annelida. A Presentation By: Heather & Esther. Common Name: Segmented Worms. Leech (medicinal). Video 1: Locomotion of an Annelid http://www.youtube.com/watch?v=dHkDdLQ32ys. Locomotion: Setae (hairs) and Parapodia (limbs).

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Kingdom Animalia

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Kingdom animalia

Common Earth Worm

Kingdom Animalia

Phylum Annelida

A Presentation By: Heather & Esther


Common name segmented worms

Common Name: Segmented Worms

Leech (medicinal)

Video 1: Locomotion of an Annelid

http://www.youtube.com/watch?v=dHkDdLQ32ys

Locomotion: Setae (hairs) and Parapodia (limbs)

Digestion: Extracellular (mouth and anus)

Video 2: Simplified Digestion of an Annelid

http://www.youtube.com/watch?v=oH8NMYi7qqw


Annelids

Annelids

Body Segmentation: Segmented into Metameres

(metameres: repeated sections with individual structures)

Body Plan: A Coelomate Animal

(coelomate: gap between endoderm and outer tubes) *1st Animals to develop a complete coelom*

Body Symmetry: Bilateral (2 sides are symmetrical)

Support: Muscle groups and simple Appendages


Annelids polychaetes oligochaetes

Annelids: Polychaetes & Oligochaetes

Nutrition: Marine Worms-

filter feeders or scavengers

Earth Worms-

digest organic materials from the soil

Leeches-

predators, feed on the blood of other animals

Vascular: Closed System of Blood Vessels (contains several muscular vessels- “hearts”)


Gas exchange

Gas Exchange

Capillary beds pick up or release nutrients and oxygen

Respiratory gas diffuses across the body wall

Gas exchange occurs between capillary beds of body surface and environment

Oxygen is carried by respiratory pigment(hemoglobin) in the blood plasma


Defense mechanisms and response to stimuli

Defense Mechanisms and Response to Stimuli

Nervous system

Cerebral ganglia and Ventral nerve cord with paired segmental ganglia in etch segment

This helps coordinate swimming/crawling

Eyes in some polychaetes, not in Earthworms or leeches

Receptor 2 light, chemical, & mechanical stimulant on body surface


Excretion

Excretion

  • Kidney-like organ: Nephridium

    - One per segment (metamere).

    - Nephrostoma (openings) collect residuals from mesoderm

    - filters residue and causes reabsorbtion.

    - Material excreted by nephridiopore (one body surface)


Reproduction

Reproduction

Polychaeta

  • Regenerate lost segments, and may naturally break off if grabbed by a predator

  • They reproduce by either Binary Fission/budding

    Oligochaeta

  • This kind reproduces sexually by cross fertilization (exchange sperm)

  • Align opposite direction, exchange sperm

  • Clitella secretes mucus cocoon.

  • Cocoon slides along worm, picking up eggs and then storing sperm

  • Cocoon slips off worm’s head and remains in the soil while embryo develops

  • Hatches from cocoon


Quiz time

QUIZTIME!!!

CROSS FERTILIZATION!!

BILATERAL!!!

How do oligochaeta reproduce?

What type of body symmetry do Annelida have?


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