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Zoology Biology 212 Lake Tahoe Community College Winter Quarter Instructor: Sue Kloss

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Zoology - Biology 212 Lake Tahoe Community College

Winter Quarter Instructor: Sue Kloss




  1. Intro:

  1. Arthropods are the most successful animal phylum

  2. Characteristics of Phylum Arthropoda:

  1. metamerism modified

  2. chitinous exoskeleton

  3. paired jointed appendages

  4. ecdysis or molting

  5. nervous system

  6. coelom reduced

  7. open circulatory system

  8. digestive tract

  9. metamorphosis

  1. Arthropods and annelids are closely related

  1. protostome

  2. other common characteristics

  3. taxonomy

  4. 4 subphyla of living Arthropods

  1. one extinct subphyla of Arthros,

  2. Metamerism and Tagmatization

  1. 4 aspects of arthropods have contributed to their success

  1. metamerism

  2. exoskeleton or cuticle

  3. metamorphosis

d. Hemocoel

E. Classification and relationship to other animals

1. Arthropods and annelids

2. The four traditional subphyla have 3 extant groups

II. Subphylum Chelicerata

  1. spiders, mites, and ticks, and less familiar animals

1. chelicerates
B. Class Merostomata

1. 4 species of horseshoe crabs remain

2. Horseshoe crabs scavenge

3. body form has remained unchanged

4. carapace

5. chelicerae, pedipalps

6. Opisthosoma

C. Class Arachnida

1. misrepresented members of the animal kingdom

2. Form and function

D. Order Scorpionida - Scorpions

1. tropical and warm temperate climates

2. have small chelicerae

3. pair of enlarged, chelate pedipalps

4. opisthosoma is divided

5. at tip of tail is a stinger

6. reproduction

7. most arthropods are oviparous

8. some arthropods are ovoviparaous

9. some scorpions have internal development of embryos

E. Order Araneae - largest group of arachnids

1. chelicerae with poison glands and fangs

2. pedipalps

3. eyes

4. waistlike pedicel

5. feed on insects and other arthropods

6. mating is complex

F. Order Opilones

G. Order Acarina

H. Class Pycnogonida

III. Subphylum Crustacea

A. Class Malacostraca

B. Class Branchiopoda

C. Class Copepoda

D. Class Cirripedia

Lesson Objective Questions

  1. Why is the fact that humans feed herring and other fish in the form of fish meal to livestock inefficient?

  2. List 3 or 4 defining characteristics of Phylum Arthropoda

  3. Why do zoologists think Arthropods and Annelids are closely related?

  4. What are subphyla of Phylum Arthropoda? Which are extinct? List some common names of animals in each.

  5. Describe fully 3 aspects that have led to success of Arthropods

  6. Describe ecdysis.

  7. Describe external structures of chelicerates.

  8. What are the modifications and appendages (and their uses of prosomas and opisthosomas of chelicerates?

  9. Describe external form and ecological niche of Class Merostomata.

  10. Describe external form and ecological niche of Class Arachnida.

  11. How do arachnids subdue prey?

  12. What are the uses of spiders webs?

  13. What is the nervous and sensory equipment of an arachnid?

  14. Describe external form, reproduction and circulation and waste excretion of Class Scorpionida.

  15. List 3 classes of subphylum Crustacea, and give common names of organisms in each.

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