Download Invertebrate Vocabulary

Invertebrate Vocabulary
Vocabulary Term
1. anterior
Definition
Picture
The front end
Pg 599
Anterior
2. asymmetry
Irregular in shape, without symmetry
Pg 598
3. bilateral
symmetry
A condition in which two equal halves of a body
mirror each other.
Pg 598
4. book lungs
Respiration – Air enters the lung of a spider
Pg 670
5. budding
asexual reproduction in which a part of the parent
organism pinches off
Pg 487
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6. cephalization
Pg 599
Concentration of nerve tissue and sensory organ at
the anterior end of an organism
7. cephalothorax
In arachnids and some crustaceans the body part
made up of the head and the thorax
Pg 666
8. chitin
A carbohydrate that forms part of the exoskeleton
of arthropods and other organisms, such as
insects, crustaceans, fungi and some algae.
Pg 482
9. closed
circulatory system
Heart that circulates blood through that forms a
closed loop
Pg 606
10. cnidocyte
Stinging cells located on tentacles
Pg 623
11. coelom
Body cavity that contains internal organs.
Pg 600
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12. compound eye
Eye composed of many light detectors, separated
by pigment cells.
Pg 666
Dorsal
13. dorsal
Top half
Pg 599
14. endoskeleton
An internal supporting skeleton
Pg 608
15. exoskeleton
Hard, external, supporting structure that develops
from the ectoderm
Pg. 607
16. foot
Appendage that some invertebrates use to move
Pg 431
17. ganglion
Pg 606
Invertebrate Vocabulary
Clusters of neurons in bilateral symmetric
animals
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18. gastrovascular
cavity
A cavity that serves both digestive and circulatory
purposes in some cnidarians.
Pg 605
19. gill
In aquatic animals, a respiratory structure that
consists of many blood vessels
Pg 605
20. hermaphroditic
Organism that has both make and female
reproductive organs.
Pg 609
21. hydrostatic
skeleton
Pg 607
Consists of water that is contained under pressure
in a closed cavity.
(like a balloon filled with water)
22. invertebrate
Animal that does not have a backbone
Pg 424
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23. mandible
Mouth part in arthropods used to pierce and suck
food.
Pg 673
24. mantle
Layer of tissue that covers the body of many
invertebrates.
Pg. 643
25. metamorphosis
Pg 675
Phase of life cycle of many animals during which
a rapid change from the immature organism to
adult take place.
26. molt
Shedding of exoskeleton
(skin, feathers, or horns)
Pg 668
27. nephridium
Tube which invertebrates get rid of waste
Pg 644
28. nerve cord
Central nervous cord
Connects the ganglia-nervous system
Pg. 630
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29. nerve net
Pg 606
Nerve cells are linked to one another in a web
called a nerve net.
30. notochord
Rod shaped supporting axis found in the dorsal
(top half) part of the embryos of all chordates.
Pg 700
31. open circulatory
system
Circulatory system which the fluid is not
contained entirely within vessels.
Pg 606
32. parasite
Pg 362
One organism feeds on and lives on or in another
organism.
(ticks, fleas, mosquitoes)
33. posterior
Back end
Pg 599
posterior
34. pseudocoelom
False body cavity
Pg 600
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35. radial symmetry Body plan in which the part of an animals body
are organized in a circle around a central axis
Pg 598
36. radula
Tongue like organ covered with chitinous teeth.
That is used for feeding by mollusks
Pg 643
37. segmentation
Repeating similar units
Example: earthworm
Pg 601
38. sessile
Organism that remains attached to a surface for
its entire life and does not move
Pg 618
39. setae
External bristles or spines that project from the
body of an annelid.
Pg 652
40. tentacle
Flexible and finger like
Pg 623
Invertebrate Vocabulary
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41. thorax
Pg 666
Part of the body between the neck and the
abdomen.
42. tube feet
Tiny hollow tubes
Water-vascular system
Pg 695
43. ventral
Bottom or the belly
Pg 599
ventral
44. vertebrate
Animal that has a backbone, includes mammals,
bird, reptiles, amphibians and fish
Pg 267
45. water-vascular
system
A system of canals filled with a watery fluid that
circulates through-out the body of an echinoderm.
Pg 695
Invertebrate Vocabulary
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