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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
JOURNAL #1
  • What general traits do all arthropods share? List at least 5 common traits.
slide2

PHYLUM

ARTHROPODA

slide3

Kingdom Animalia

Phylum Arthropoda

Subphylum Chelicerata

Subphylum Crustacea

Lobster

Crab

Shrimp

Crayfish

Barnacles

Isopods

Class Merostomata

Horseshoe crab

Class Arachnida

spiders

Subphylum Uniramia

Class Chilopoda

centipedes

Class Hexapoda

insects

Class Diplopoda

millipedes

slide4

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
slide5

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
slide6

Grow by shedding exoskeleton- ecdysis (molting)

  • Ventral nervous system
  • Open circulatory system
  • Complete digestive system w/ mouth & anus
slide7

SUBPHYLUM

CRUSTACEA

crayfish anatomy
Crayfish Anatomy

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:

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:
  • 9thchelipeds- “claw”; food capture & defense.
  • 10th- 13thperiopods- walking legs for movement
paired appendages abdomen
Paired appendages- Abdomen:
  • 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

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
Circulation
  • Open circulatory system
  • Have heart with short vessels
respiration
Respiration
  • Gills- feathery; under carapace
  • Maxillae- push water over gills while resting.
  • Walking legs- push water over gills while moving.
excretion
Excretion

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
  • 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
Reproduction
  • 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
  • Part of the Food chain
  • Control animal populations
  • Major source of protein for many regions of the world’s human population.
  • Decomposers (rolly polly)
slide22
The structure responsible for excretion in crayfish is

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

DAILY QUIZ #1

slide23

ANTENNAE 4. ABDOMEN

  • ANTENNULES 5. PLEOPODS
  • CARAPACE
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