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JOURNAL #1. What general traits do all arthropods share? List at least 5 common traits. PHYLUM ARTHROPODA. Kingdom Animalia. Phylum Arthropoda. Subphylum Chelicerata. Subphylum Crustacea Lobster Crab Shrimp Crayfish Barnacles Isopods. Class Merostomata Horseshoe crab.

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Journal 1

  • What general traits do all arthropods share? List at least 5 common traits.



Kingdom Animalia

Phylum Arthropoda

Subphylum Chelicerata

Subphylum Crustacea







Class Merostomata

Horseshoe crab

Class Arachnida


Subphylum Uniramia

Class Chilopoda


Class Hexapoda


Class Diplopoda


  • General Arthropod Characteristics

  • Arthropod means “jointed foot”

  • Paired jointed appendages

  • Segmented bodies

  • Tagmatization- body regions have specific functions

  • a. Head- sensory/feeding

  • b. Thorax- locomotion

  • c. Abdomen- visceral functions

  • Exoskeleton

  • a. Support & protection

  • b. Prevents water loss

  • c. Two layers

  • 1. Epicuticle- lipoprotein; impermeable to water & pesticides

  • 2. Procuticle- chitin; thick, tough, leathery protein



Crayfish anatomy
Crayfish Anatomy polly)

Body regions

  • Cephalothorax- fused head & chest region. Covered by hard, sclerotized carapace.

  • Abdomen- has some swimming appendages and visceral organs. In some, takes form of muscular tail.

Paired appendages head
Paired appendages- Head: polly)

1stAntennae- long; sense, feed, taste

2ndAntennules- short; sense, feed, taste

3rdMandibles- chewing & grinding

4th, - 6thmaxillae- small, hair-like; respiration, food handling, taste

7th, 8thmaxillipeds- larger than maxillae, food handling, taste

Paired appendages thorax
Paired appendages- Thorax: polly)

  • 9thchelipeds- “claw”; food capture & defense.

  • 10th- 13thperiopods- walking legs for movement

Paired appendages abdomen
Paired appendages- Abdomen: polly)

  • Pleopods- hair-like swimmerets may help with swimming; First 2 pairs at junction of thorax & abdomen are used to determine gender & for sexual reproduction

  • Telson- tail like structure at end of abdomen. Anus located here.

  • Uropods- 2 flipper-like structures on either side of abdomen (total of 4 uropods); aid in steering/swimming

Digestion feeding
Digestion/Feeding polly)

1. Scavengers & predators- eat other invertebrates, some plants

2. Foregut/stomach- enlarged part of stomach in cephalothorax;contains tooth-like structures (gastric teeth) for grinding food.

3. Digestive gland- secrete enzymes into stomach & store food.

4. Intestine- embedded in muscular abdomen.

5. Anus

Circulation polly)

  • Open circulatory system

  • Have heart with short vessels

Respiration polly)

  • Gills- feathery; under carapace

  • Maxillae- push water over gills while resting.

  • Walking legs- push water over gills while moving.

Excretion polly)

1. Green glands- kidney-like organs located behind 2nd pair of antennae.

2. Renal pore- ammonia liquid waste released through this pore in front of head.

Nervous sensory system
Nervous & Sensory System polly)

  • Cerebral ganglion- fused trilobed brain

  • Ventral nerve cord- runs along belly with small ganglia masses

  • Compound eyes- on movable stalks

  • Setae- hair-like on mouth & antennae; detect food & pheromones

Reproduction polly)

  • Dioecious

  • Mating occurs after females molt in fall.

  • Male inseminates female using 2 stiff anterior pleopods.

  • In the spring, as the female passes eggs out of her body, they become fertilized.

  • Eggs attach to pleopods on abdomen where they stay until hatching.

Economical environmental importance
Economical/Environmental Importance polly)

  • Part of the Food chain

  • Control animal populations

  • Major source of protein for many regions of the world’s human population.

  • Decomposers (rolly polly)

  • The structure responsible for excretion in crayfish is polly)

    a. Kidney b. Green gland c. cheliped

  • The pincers used for food capture & defense are called

    a. Pleopods b. Chelipeds c. tweezers

  • The large finger-like structures around the mouth that are used for tasting & food handling are

    a. Maxillipeds b. Mandibles c. telson

  • Which organism does not belong to class Arachnida?

    a. Scorpion b. Horseshoe crab c. tick

  • The enlarged finger-like structures around the mouth of the spider which can hold sperm in male spiders are called

    a. Pedipalps b. Spinnerets c. abdomen