A Journey to the
Animal Kingdom:
Invertebrate District
Determine the distinguishing
characteristics of invertebrates
A Journey to the
Animal Kingdom:
Invertebrate District
LOOKING BACK:
Choose the letter of the best answer.
1. Snakes, lizards, and salamanders are examples of
A. Reptiles C. Mammals B. Amphibians D. Fishes
2. Which body part of mammals produces the milk for
their young?
A. pituitary gland B. breast C. mammary gland D. areola
3. Vertebrates are characterized by their presence of
A. endoskeleton B. exoskeleton C. backbone D. lungs
4. All of the following are cold-blooded animals except
A. Birds B. Fishes C. Reptiles D. Amphibians
5. Which group of vertebrates does a whale belong to?
A. Reptile B. Mammal C. Amphibian D. Fish
Invertebrate Animals
KEY CONCEPT:
Invertebrates are animals without a backbone.
Five animal groups that are considered invertebrates:
insects,
arachnids,
worms,
echinoderms,
mollusks,
and coelenterates
Image from:
https://www.google.com/search?q=invertebrate%20animals%20pics&tbm=isch&safe=active&tbs=rimg:CbuZHE6EtR7
GYcDu7EA73G6Q&rlz=1C1CHBD_enPH907PH907&hl=en&sa=X&ved=0CB0QuIIBahcKEwjI2
Invertebrate Animals
Image from:
https://lauramr42.github.io/My_exeLearning/invertebrates.html
Invertebrate Animals
REMEMBER!
Invertebrates animal are animals that do not
have backbones.
Worms are flattened, elongated, wormlike animals.
Insects are segmented animals with hardened outer
skeleton and jointed appendages.
Arachnids have just two body regions,
a cephalothorax (soft and unsegmented),
and an abdomen (hard and includes a spider's
infamous set of eight legs).
These two body regions are joined by a narrow
tube at their waist called a pedicel.
Invertebrate Animals
REMEMBER!
Mollusks have a soft body covered
in a cloak-like mantle called a shell.
They often use shells to protect
themselves.
Echinoderms have rays or arms,
often in multiple of five. They have
numerous tube feet for movement
and are also used to collect food on
the sea floor.
Coelenterates exhibit radial
symmetry and are characterized by
presence of stinging tentacles.
Do CHECK YOUR UNDERSTANDING (Page 8)
REFERENCES:
Electronic References
• https://creativecommons.org/
• https://quizizz.com/admin/quiz/5cf7d9c08df66c0020b45a27/invertebrateclassification
• https://live.newscientist.com/ media/KS2---Activity-at-School---Classification-of Invertebrates.pdf
• https://www.dec.ny.gov/docs/administration_pdf/lpvertebrates.pdf
• https://www.toppr.com/guides/biology/animal-kingdom/phylum-coelenterata/
• https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_I
ntroductory_Biology_(CK12)/11%3A_Invertebrates/11.01%3A_Invertebrate_Characteristics
• https://flexbooks.ck12.org/cbook/ck-12-middle-school-lifescience2.0/section/9.4/primary/lesson/flatworms-ms-ls
• https://microbenotes.com/characteristics-of-invertebrates/
• https://byjus.com/biology/invertebrates/