Download Week 9 Invertebrates Follow Along Sheet

Biodiversity: Week 9 Follow-Along Sheet
INVERTEBRATES
Concept Map Critique (7 pts)
- Individual assignment where you critique another group’s concept map.
- Group 1 will do Group 2, Group 2 will do Group 3, etc. Last group does 1st group.
DUE: Monday-Wednesday Class: Friday, November 1st, 11:59pm
Thursday-Friday Class: Sunday, November 3rd, 11:59pm
Moodle Survey (3 pts)
- Must complete all at one time. Completely confidential.
DUE: Monday-Wednesday Class: Friday, November 8th, 11:59pm
Thursday-Friday Class: Sunday, November 11th, 11:59pm
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Kingdom ______________(Metazoans)
Multicellular
Lack a backbone
Account for _________ of all known animal species
Have various body structures
Occupy almost every habitat
Phylum Porifera: The Sponges
• Lack true tissues and organs (Parazoa)
• Mostly marine animals
• ___________________
• ____________ – remain in one location throughout life
• Skeleton is composed of spicules secreted by amoeboid cells
• Filter-feeders: Water current is created by the flagella on the _________________
• Simplest forms possess an _______________
Eumetazoans with Radial Symmetry (2 germ layers = Diploblastic)
All Eumetazoans have _______ _____________.
Animals that possess radial symmetry have a distribution of several planes down a central axis that
create equal halves.
›› There is no front, back, left, or right.
›› However, there are ____________ and ____________ surfaces.
Phylum Cnidaria
• Jellyfish, Hydra, Sea Anemones
• Have true tissues (Eumetazoa)
• ___________Symmetry
Two Distinct diploid body forms:
__________: Sea anemone form (sessile)
• ________________: 2 tissue layers
__________: Jelly-fish form (motile)
– Epidermis (outer layer)
– Gastrodermis (inner layer)
• Incomplete digestive tract, primitive organ development
• No anus – waste passes through the mouth!
• “Box-jellyfish” (______________) have well-developed eyes.
• Cnidocytes - specialized cells that contain stinging
structures called ___________________
Three Classes of Cnidaria
Class _____________
 alternate between medusa and POLYP form
 Polyp form is dominant
 examples: Portuguese man-o’war, hydra,
fire coral
Class _______________
 alternate between MEDUSA and polyp form
 Medusa form is dominant
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examples: jellyfish, box-jellyfish, sea wasps
Class _______________
 POLYP form only!
 examples: most corals, sea fans, sea anemones
PHYLUM CTENOPHORA: “Comb Jellies”
• Possess 8 comb rows of fused ____________
• Largest organism to use cilia for locomotion!
• Usually have a pair of retractable tentacles
• Resemble the medusa stage of cnidarians
DIPLOBLASTIC : 2 tissue layers
- ectoderm and endoderm (also sometimes referred to as ectodermis and gastrodermis, respectively)
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Exhibit bioluminescence
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No nematocysts (usually)
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Have cells called _______________for adhesion to capture prey
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________________ - move with the ocean currents
Eumetazoans with Bilateral Symmetry
Animals that possess bilateral symmetry can be cut in half along the central axis.
›› _________________ has evolved, resulting in
the use of their head for orientation.
›› _________________: Have three germ layers.
Examples:
3 Body Plans found in BILATERAL Organisms
Acoelomates: No body cavity
Pseudocoelomates: Body cavity ______________ lined with mesoderm
Coelomates: Body cavity __________________ lined with mesoderm
Phylum Platyhelminthes
• Also known as “_________________”
• Triploblastic: 3 germ layers
– Ectoderm: outer layer
– Mesoderm: middle layer
– Endoderm: inner layer
• Acoelomate : no body cavity
• Gas exchange occurs across body surface
• ________________ : male and female parts
• Can undergo ______________
Phylum Nemertea
• Commonly called “Ribbon” worms
• Possess a ______________ for feeding/capturing prey
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BROOKS’ STUDENTS – Nemertea is an _______________: Evidence suggests no body cavity.
FRAZIER’S STUDENTS – Nemertea is a ________________: Evidence suggests body cavity
partially lined with mesoderm.
1st group to evolve a complete digestive tract!
1st group with a closed circulatory system!
Phylum Rotifera
• Microscopic organisms
• Pseudocoelomate body cavity
• Complete digestive tract with mouth and anus
• Many reproduce via ____________________
Phylum Nematoda: “Roundworms”
• Pseudocoelomate body cavity
• Free-living and parasitic species
• Extremely abundant
• Bodies are NOT segmented
• Only have longitudinal muscles
– Whips back and forth
Phylum Mollusca
• Aquatic and terrestrial forms
• _________________(mouth forms first – before anus)
• 2nd largest animal group (after Phylum Arthropoda, which is the largest)
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_______________: Coelom or body cavity completely lined with mesoderm
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Body parts:
• Mantle
• Head/foot
• Visceral mass (gills and gut)
• Shell (usually)
• Radula for feeding
Class Cephalopoda:
Class Bivalvia:
Class Polyplacophora:
Class Gastropoda: