1. Blackworm fACTS

2. Arthropoda ”jointed foot”
Classification
Lumbriculus variegatus
WOWBug
Blackworm
EarthWorm
Human
Kingdom
Animalia
Phylum
Arthropoda ”jointed foot”
Annelida
“tiny rings”
Chordata- has backbone
Class
Insect
Oligochaeta-
Oligo= few
Chaeta= hairs
on each body segment
Oligochaeta
Mammalia- nurse young

3. Require Nutrients to Make ATP- How???
Cellular Respiration
plants
1. FOOD
Fresh water invertebrate that feeds on
decaying vegetation (plants)
and microorganisms (animals)
Where do they live??
2. BREATHING
Through Skin
Occurs through the skin of tail> forms right angle at water surface > gas exchange occurs between outside air and pulsating blood vessel
Earthworms???
Where do they live??
soil

4. Reproduction
Hermaphroditic – contain both male and female sex organs [like earthworm]
Sexual - not common - Sperm exchanged > produce cocoons containing 4-11 fertilized
eggs ; After 2 weeks > new worm emerges about 1 cm in length-
Mostly Sexual
2. Asexual- regeneration - can be divided into smaller pieces and form
new worm ; difficult to determine life span
Clitellum to Rear only
Life Span 5-6 years

5. Nervous System
Nerve Cord_- runs entire length of body- located beneath intestines
PN, prostomial nerves; CG, cerebral ganglion; n1-n4, segmental nerves 1-4; VNC, ventral nerve cord.
Same

6. Movement : Crawling or Corkscrewing
Same
Muscles- 2 Layers Line Body- provide movement
- controlled by Nerve Cord
Circular - around body
Longitudinal- length of body
Together cause constricting and lengthening
followed by increasing diameter and shortening
allow worm to move in corkscrew fashion in
water, swimming short distances or
crawl through soil

7. Digestion/Excretion Same Setae- 2 pairs
2. Chaetae - 2 pairs of bristles located on each segment
- used to anchor worm and increase traction
- help worm crawl
Digestion/Excretion
has complete digestive tract
including mouth and anus
Same

8. Circulation System - consists of dorsal, ventral and lateral vessels
Contracting muscles around posterior vessel form waves “like opening and closing fist” and move blood from posterior end toward anterior end
Blood flow
Starts at posterior end “pulses” through dorsal vessel toward anterior end
Returns to tail through ventral vessel no “pulsing”
Lateral vessels supply blood to segments
Types of Circulatory Systems-
1. Closed- blood moves through body in vessels [arteries/veins]
2. Open- blood not contained in vessels, blood bathes all internal
organs
BLACKWORMS & EARTHWORMS HAVE A CLOSED CIRCULATORY SYSTEM
5 Hearts- Aortic Arches
Blood pumped from anterior to posterior

9. Respond to Environment
Brain senses light, vibrations
Protective Response
When at surface of water, tail of worm can detect shadow or sudden vibration
[using photoreceptors ]
Rapid Reflex- responds by quickly contracting its muscles, withdrawing tail
from predator