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Phylum Arthropoda

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Phylum Arthropoda insects, spiders, scorpions, ticks, mites, centipedes, millipedes, and crustaceans largest phylum in the animal kingdom; one million species ... – PowerPoint PPT presentation

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Title: Phylum Arthropoda


1
Phylum Arthropoda
  • insects, spiders, scorpions, ticks, mites,
    centipedes, millipedes, and crustaceans
  • largest phylum in the animal kingdom one million
    species recorded est. gt 30,000,000
  • mostly small active (complex behaviors)
  • ecologically diverse economically important

2
Positive Impacts
  • food for humans
  • pollinators
  • decomposers
  • silk, wax, honey
  • predators prey- integral part of the food web
  • bioindicators
  • biological control

3
Negative Impacts
  • competitors
  • pests
  • disease vectors
  • parasites
  • venomous

4
General Features
  • eucoelomate, protostomes
  • exoskeleton - support protective
  • water loss, mechanical injury, chemical injury,
    UV barrier
  • made of chitin- polysaccharide similar to
    cellulose strong indigestible
  • protein, lipid, CaCO3 water and gas
    impermeable
  • ecdysis - molting/shedding

5
Exoskeleton
  • epicuticle
  • procuticle
  • sclerotization
  • resilin

6
Metamerism
  • conspicuous segmentation
  • repetition of tissues organs

7
Tagmatization
  • segments fuse together into body parts
  • head
  • cephalothorax
  • thorax
  • abdomen

8
Arthropod Features (cont.)
  • jointed appendages (specialization)
  • locomotion, sensation, feeding
  • generally one pair/segment
  • complex muscular system
  • complete complex digestive system

9
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10
Circulation Respiration
  • open circulatory system
  • dorsal contractile heart
  • vessels
  • hemocoel
  • respiration
  • body surface diffusion
  • trachae- respiratory exchange tubes spiricles-
    external openings
  • gills book lungs- folded epithelium covered by
    chitin

11
Nervous System
  • nervous system annelid-like
  • sensory system well developed
  • compound eyes ocelli
  • tympanum
  • tactile chemo- receptors
  • statocysts

12
Excretory Reproductive Systems
  • Excretion
  • coxal glands- merostomata, arachnids
  • antennal glands-crustacea
  • maxillary glands-crustacea
  • reproduction
  • dioecious
  • internal fertilization
  • oviparous, oviviparous viviparous
  • direct indirect development
  • parthenogenesis

13
Sub-Phylum Trilobitamorpha Class Trilobita
  • extinct Paleozoic
  • benthic scavengers
  • segmented
  • compound eyes
  • biramous appendages

14
Trilobites
15
Trilobite Diversity
16
Biramous Appendages
17
Sub-phylum Chelicerata
  • eurypterids, horseshoe crabs, spiders, and ticks,
    and mites
  • no antennae or mandibles
  • chelicerae - tear food, venom injection,
    secrete enzymes
  • (6) pair of appendages pedipalps
  • predators/carnivores

18
Class Merostomata Horseshoe Crabs
19
Class Arachnida
  • first terrestrial metazoans
  • spiders, scorpions, ticks, and mites

20
Order Aranae (spiders)
  • 35,000 species
  • cephalothorax no external segmentation
  • pedipalps- appendages used to hold food mating
  • silk (prey capture, egg case, ballooning)
  • book lungs, trachae or both

21
Spider Anatomy
22
Internal Structure
23
Venomous Species in North America
24
Day 3
25
Day 6
26
Day 9
27
Day 10
28
Order Scorpionida
  • secretive nocturnal
  • mostly harmless
  • stinger on the telson
  • pectines
  • chelicera
  • chilipeds

29
Order Pseudoscorpiones
30
Order Acari (Acarina)
  • mites ticks
  • reduced segmentation
  • parasites
  • important disease vectors
  • Lyme Disease
  • Rocky Mtn. Spotted Fever
  • Ixodidae- hard ticks

31
Tick Hypostome
32
Parasitic Mites
33
Scabies
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