Transcript Class Crustacea

Phylum Arthropoda
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Jointed Appendages
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Number of species
Mollusca
Chordata
Platyhelminthes
Nematoda
Arthropoda
Porifera
Annelida
Echinodermata
Sarcomastigophora
Apicomplex
Ciliophora
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Characteristics of Arthropods
• Jointed appendages
– Extensive variation and
adaptations(antennae, legs, wings.
Mouthparts)
• Segmented (metameric)
• tagmatation- fusion of segments to
form body regions(head, thorax,
abdomen; cephalothorax in some)
Ecdysis- “an
• Open circulatory system
escape” - growth
• Ventral nerve cord
by molting
• Compound eyes
• Bilateral symmetry
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• Exoskeleton
Arthropods
Most Successful Animals
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Number of species
Diversity
Distribution
Longevity
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Reasons for Success
• Versatile exoskeleton
• Segmentation
• Oxygen piped directly
to cells (terrestrial)
• Highly developed
sensory organs
• Complex behavior
• Metamorphosis
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Modifications of Exoskeleton
From A Life of Invertebrates, Copyright © 1979, W. D. Russell-Hunter.
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Compound Eye
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Metamorphosis:
completeegglarvapupa adult
incomplete- eggnymphadult
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Monarch Butterfly
Egglarva (caterpillar)pupa (in chrysalis)
adult
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Arthropod Groups
• Subphylum Trilobitomorpha
Class Trilobita- extinct trilobites
• Subphylum Chelicerata
Class Merostomata – horseshoe crabs
Class Arachnida- spiders, mites, etc.
• Subphylum Mandibulata
Class Myriapoda- centipedes, millipedes
Class Insecta- insects
Class Crustacea- lobsters, crabs, etc.
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Subphylum Trilobitomorpha
• Class TrilobitaTrilobites
• Successful for over
300 million years
• Extinct
540-200 MYA
• One pair of antennae
• appendages
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Subphylum Chelicerata
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Chelicerae( fangs)
No antenna
No mandibles
4 pair of walking legs
1 pair of pedipalps
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Class Merostomata
• Limulus (horseshoe
crabs)
– First fossils 445 MYA
– Lived before dinosaurs
• Segments-Carapace
and Telson
• Blood used by
pharmaceutical
companies to test for
endotoxins and
pathogens
• http://shltrip.com/Horse
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pedipalps
Walking legs
Spines
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Class Arachnida
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Spiders
Scorpions
Ticks
Mites
All Have book lungs
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Class Arachnida
• Chelicerae (fangs) 1st pair
of appendages around
mouth- often with poison
• No antennae
• 4 pair of walking legs
• 2 body segments
(cephalothorax + abdomen)
– Except mites & ticks
• Most are predators
– Inject enzymes into prey
– Suck fluid into pharynx
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Arachnid Body Regions
Prosoma or
Cephalothorax
Ophisthosoma or Abdomen
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Order Scorpionida
Large pedipalps
Abdominal stinger
Photo (a) © SS#11/PhotoDisc
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Order Araneae
• Spiders
• Fangs with poison
glands
• Silk glands
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Arachnid Book Lung
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Dugesiella
• Tarantula
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Latrodectus mactans
• Black widow spider
• Neurotoxin
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Loxosceles reclusa
• Fiddle back spider
– Brown recluse
– Brown
– Violin
• Necrotoxin
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Loxosceles reclusa
• Necrosis of tissue
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Day 3
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Day 4
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Day 5
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Day 6
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Day 9
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Day 10
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Order Acari
• Ticks
• Mites
• Full tagmatation-all
Body segments fused
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Rocky Mountain Spotted Fever
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Ticks are vector
High fever
Headache
Muscle pain
Rash
– BEGINS ON
EXTREMETIES
• 25% fatal without
antibiotics
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Dermacentor variabilis
Dog tick
Dermacentor andersoni
Wood tick
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Dermatophagoides
• Dust mite
• Allergies to fecal
products
• 1 gram of dust holds
250,000 droppings
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Trombicula
• Chigger mite
• Larva feed on skin
• Dermatitis
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Order Opiliones
• One body segment
• Short fangs
• Myth- not most
venomous
• Daddy- long legs,
harvestmen,
opilioids
• http://spiders.ucr.e
du/daddylonglegs. 41
html
Arthropod Groups
• Subphylum Trilobitomorpha
Class Trilobita- extinct trilobites
• Subphylum Chelicerata
Class Merostomata – horseshoe crabs
Class Arachnida- spiders, mites, etc.
• Subphylum Mandibulata
Class Myriapoda- centipedes, millipedes
Class Insecta- insects
Class Crustacea- lobsters, crabs, etc.
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Subphylum Mandibulata
Class Myriapoda
centipedes and millipedes
Class Insecta
most diverse animal class
flies, bees, beetles, ants, etc.
Class Crustacea
crabs, lobster, barnacles,
copepod
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Subphylum Mandibulata
• Two pair of antennae
(anterior to feeding
appendages)
• Third segment bear
mandibles (jaws for
chewing or grinding)
• Compound eye
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Class Myriapoda
• “many
appendages”
• Fewer than 10 to
hundreds of
appendages
• Millipedes (mostly
herbivorous + plain
in color)
• Centipedes
( colorful,
carnivorous)
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Class Insecta(FKA-Hexapoda)
• Most biodiverse class of
animals
• Only invert.s that can fly
• Distinctive head, thorax,
abdomen
• Typically –three pair of
legs (6)
• Have metamorphosis
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Class Crustacea
• Biramous appendagesseparate into two rays
• 3 pairs modified as
mouth parts
• Two pair antennae
• gills
• Naupliar larval stage
• Crabs, copepods,
crayfish, barnacles,
lobster, shrimp, pill bugs
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Class Crustacea: Pill Bug
•Only crustacean that is
entirely terrestrial
•“rollie pollies”
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Copepod
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Barnacle
Cirri
Testis
Penis
Anus
Mouth
Stomach
Ovary
Cement gland
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Fig. 19.24a
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Crayfish
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1. Gonopods
2. Opening of vas
deferens(duct
for sperm
release)
3. Opening of
oviduct
4. Seminal
receptacle
(opening used
to accept sperm
for fertilization)
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Fig. 19.5
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Fig. 19.7
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The End
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