Phylum Arthropoda 1 Jointed Appendages 2 Number of

Phylum Arthropoda 1 Jointed Appendages 2 Number of

Phylum Arthropoda 1 Jointed Appendages 2 Number of species

Mollusca Chordata Platyhelminthes Nematoda Arthropoda Porifera Annelida

Echinodermata Sarcomastigophora Apicomplex Ciliophora 3 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

4 Exoskeleton Arthropods Most Successful Animals

Number of species Diversity Distribution Longevity 5

Reasons for Success Versatile exoskeleton Segmentation Oxygen piped directly to cells (terrestrial) Highly developed sensory organs

Complex behavior Metamorphosis 6 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Modifications of Exoskeleton

From A Life of Invertebrates, Copyright 1979, W. D. Russell-Hunter. 7 Compound Eye 8

Metamorphosis: completeegglarvapupa adult incomplete- eggnymphadult 9 Monarch Butterfly

Egglarva (caterpillar)pupa (in chrysalis) adult 10 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. 11

Subphylum Trilobitomorpha Class TrilobitaTrilobites Successful for over 300 million years Extinct 540-200 MYA

One pair of antennae appendages 12 Subphylum Chelicerata

Chelicerae( fangs) No antenna No mandibles 4 pair of walking legs

1 pair of pedipalps 13 Class Merostomata Limulus (horseshoe crabs)

First fossils 445 MYA Lived before dinosaurs Segments-Carapace, abdomen and Telson Blood used by pharmaceutical

companies to test for endotoxins and pathogens http://shltrip.com/Horse shoe_Crab.html 14

15 pedipalps Walking legs Spines 16

10/13/2015 1. Find new seat, graded papers are at your seats. TURN IN horseshoe crab lab 2. A Tale of Two Species Horseshoe Crab Article w/ Guided Questions- Due Today BEFORE you leave 3. Class Arachnida Notes 4. Incredible World of Spiders Video w/

guided Questions 17 Class Arachnida

Spiders Scorpions Ticks Mites All Have book lungs

18 Class Arachnida Chelicerae (fangs) 1st pair of appendages around mouth- often with poison 4 pair of walking legs 2 body segments

(cephalothorax + abdomen) Except mites & ticks Most are predators Inject enzymes into prey Suck fluid into pharynx 19

Arachnid Body Regions Prosoma or Cephalothorax Ophisthosoma or Abdomen 20

Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Order Scorpionida Large pedipalps Abdominal stinger Photo (a) SS#11/PhotoDisc

21 Order Araneae Spiders Fangs with poison glands Silk glands

22 23 24 Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Arachnid Book Lung 25 Dugesiella Tarantula 26

Latrodectus mactans Black widow spider Neurotoxin 27 Loxosceles reclusa Fiddle back spider

Brown recluse Brown Violin Necrotoxin 28

Loxosceles reclusa Necrosis of tissue 29 Day 3 30

Day 4 31 Day 5 32

Day 6 33 Day 9 34

Day 10 35 Order Acari Ticks Mites

Full tagmatation-all Body segments fused 36 Rocky Mountain Spotted Fever

Ticks are vector High fever Headache Muscle pain

Rash BEGINS ON EXTREMETIES 25% fatal without antibiotics 37

Dermacentor variabilis Dog tick Dermacentor andersoni Wood tick

38 39 Dermatophagoides Dust mite Allergies to fecal products 1 gram of dust holds

250,000 droppings 40 Trombicula Chigger mite Larva feed on skin Dermatitis

41 Order Opiliones One body segment Short fangs Myth- not most venomous

Daddy- long legs, harvestmen, opilioids http:// spiders.ucr.edu/da42 ddylonglegs.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. 43 Subphylum Mandibulata Class Myriapoda centipedes and millipedes Class Insecta

most diverse animal class flies, bees, beetles, ants, etc. Class Crustacea crabs, lobster, barnacles, copepod 44

Subphylum Mandibulata Two pair of antennae (anterior to feeding appendages) Third segment bear mandibles (jaws for chewing or grinding) Compound eye

45 Class Myriapoda many appendages Fewer than 10 to

hundreds of appendages Millipedes (mostly herbivorous + plain in color) Centipedes ( colorful, carnivorous)

46 Class Insecta Most biodiverse class of animals Only invert.s that can fly Distinctive head, thorax,

abdomen(3 body regions Typically three pair of legs (6) Have metamorphosis Oxygen goes directly into cells via spiracles 47

Class Crustacea Biramous appendagesseparate into two rays 3 pairs modified as mouth parts gills Naupliar larval stage Crabs, copepods,

crayfish, barnacles, lobster, shrimp, pill bugs 48 Class Crustacea: Pill Bug Only crustacean that is entirely terrestrial rollie pollies

49 50 51 Copepod

52 Barnacle Cirri Testis

Anus Penis Mouth Stomach Ovary Cement gland

53 Fig. 19.24a 54 55

Crayfish 56 57 58

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) 59 Fig. 19.5 60

61 Fig. 19.7 62 The End

63

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