Download Unit#3 Animal Invertebrate Notes Part 3 Phylum Mollusca What is a

Unit#3 Animal Invertebrate Notes Part 3
Phylum Mollusca
What is a mollusk?
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Soft-bodied animals with ________________ or _______________ shell
Snails, slugs, clams, squids and octopi
Least advanced of the __________________________
Bilateral symmetry
Mollusks Body Plan
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All mollusks have a basic body paln consisting of three parts:
o _____________: contains sense organs
o __________________: Internal organs
o _____________: for movement
 Crawling
 Burrowing
 Capturing Prey (tentacles)
3 Class of Mollusca
1. Gastropods: (Snail, slug): Use a muscular _____________ to crawl
 Mantle often secretes a single __________________
 Herbivores
2. Bivalves (Oyster, clam, scallop): Secrete a two-part shell with hinge
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3. Cephalopods: (octopus, squid):
 Modified mantle cavity to create jet propulsion for rapid movement
 Foot is divided into ________________ or _________________
 Complex sense organs that respond to external stimuli
 Distinguish shapes by _____________ and texture by _____________
Respiration
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Mollusks breathe using ____________ inside their mantle cavity
Open vs. Closed Circulation
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Open Circulation: system in which blood is not
always contained within
_______________________ (veins, arteries,
capillaries)
Closed Circulation: A system in which blood is
contained within blood vessels
Mollusks possess an ___________ circulatory
system
Unit#3 Animal Invertebrate Notes Part 3
Response
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The nervous system responds to ___________________________________
o Two-shelled mollusks have a simple nervous system
o Octopi have a higher developed nervous system to remember things for long periods of
time
Reproduction:
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Have __________________ reproduction
o Internal and External Fertilization
o Some mollusks are hermaphrodites
Ecology of Mollusks
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Feed of plants
Prey on ____________________
Filter algae out of the water
Eat detritus
Phylum Annelids “ Segmented Worms” Bristle Worms, Earthworms
What is an Annelid?
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Worms with ________________________ bodies
Have a true coelom _________________________
o Derived from Mesoderm Tissue
Segments are separated by a __________________
Feeding, Circulation, Respiration
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Herbivores, Carnivores and filter feeders
______________ Circulatory System
Breathe through gills
o Takes in oxygen and gives off carbon dioxide through their moist skin
Response, Movement, Reproduction:
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Well-developed nervous system
o Brain and several nerve cords
Hydrostatic Skeleton: two groups of body muscles
o Longitudinal muscles that contract
Sexual Reproduction
o _____________________
o Others are hermaphrodites
Unit#3 Animal Invertebrate Notes Part 3
Groups of Annelids
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Oligochaetes: Earthworms
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Sandworms, bloodworms
Ecology of Annelids
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Decompose matter
Earthworm castings are rich in phosphorus, potassium
Phylum Arthropoda “Jointed Feet” Ex. Insects, Spiders, Ticks, Crabs and Centipedes
What is an Arthropod?
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__________________ body
Tough Exoskeleton
o Made from protein ______________ (carbohydrate)
Jointed Appendages
o Much variation among the arthropods
 Appendages have increased or decreased in size over time
__________________ symmetry
Eucoleomates
____________________ development
Highly specialized appendages
o Feeding
o Movement
Respiration
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Breath through a network of branching _____________________ that extend throughout the
body
Arthropods have a _____________ circulatory system
Terrestrial arthropods have __________________ fertilization
Growth and Development
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When they outgrow their exoskeletons arthropods undergo periods of _________________
o Molting: sheds its entire exoskeleton
o Arthropod is vulnerable to predators while its shell is soft
Unit#3 Animal Invertebrate Notes Part 3
Three Major Groups of Arthropods
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Crustaceans:
o Crabs, shrimps, lobsters, crayfishes, and barnacles
Spiders
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Insects
o Centipedes, millipedes, and insects
 ____________________: have jaws, one pair of antennae, and unbranched
appendages
What is an Insect?
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Have a body divided into three parts:
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 Compound eyes (color and movement)
 Chemical receptors (taste and smell)
 Well-developed ears
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 Exoskeleton
 Jointed appendages
o __________________: process of changing shape and form
 Complete
 Incomplete
Insects and Humans
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Cons:
o Termites destroy wood structures
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 Locusts
o Infect humans with microorganisms that cause disease
Pros:
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o Produce silk, wax and honey
o Food delicacy
Insect Communication
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____________: Crickets communicate to find mates
_____________: Firefly produce light in the abdomen to find a potential mate
o Used distinct series of flashes to signal for mate
 Females signal back for males to fly to them
Unit#3 Animal Invertebrate Notes Part 3
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__________________: Pheromones used as a chemical messengers to affect the behavior or
development of other species
Phylum Echinoderms (Sea Star, brittle star, feather start, sea cucumber, sea urchin)
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Water Vascular System: used for respiration, circulation and movement
o No __________________ (blood)
o No __________________ (lungs or gills)
o No _________________ (waste management)
_____________________ hardened plates of calcium carbonate
______________________: blastopore develops into an anus
Eucoelomates
No cephalization (no brain or head)
_______________________ (adults)
Reproduction
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Both Asexual and Sexual
Sexual
o Reproduce by ____________________ fertilization
Asexual
o Can regrow if the piece of the animal contains the _________________________.