Ecdysozoa

Question 1

Clade Ecdysozoa

Answer 1

• Cuticle; non-living chitin layer (exoskeleton)
• Cuticle shed by edcysis (molting)
• Nematoads and Arthopods

Question 2

Phylum Nematoda

Answer 2

• Most abundant animal phyla
• No segmentation or appendages
• Psuedocoelomate
• Reproduction primarily sexual. Some hemaphrodites.
• Eutelic; post embryonic growth of indiviudal cells, not by addition of cells
• Parasitic

Question 3

Phylum Arthropoda

Answer 3

• Most species rich phyla. Over half all known animal species.
• Body plan; segmented body, hard exoskeleton, jointed appendages
• Tagmata; segments and limbs arranged into functional units with specialized functions
• Sclerotized cutile made of chitin
• Cephalization
• Reduced Coelom
• Open circulatory system

Question 4

Subphylum Trilobita

Answer 4

• Extinct marine arthropods

- Biramous limbs

Question 5

Subphylum Crustacea

Answer 5

• Cephalothorax with carapace
• Biramous limbs
• Two pairs of antennae, paired segmented manidbles, two pairs maxillae
• Compound eyes
• Thoracic limbs for locomotion
• Abdominal limbs have many functions
• Gills
• Tracheae
• Seperate sexes and sexual reproduction via copulation

Question 6

Subphylum Myriapoda

Answer 6

• Over three pairs of legs

- Less tagmatization; head; eyes, mandibles, maxillae, one pair of antenna; trunk; 9-325 pairs of joined legs

Question 7

Class Diplopoda (Myriapoda)

Answer 7

• Millipedes

- Two pairs of jointed legs per body segment

Question 8

Class Chilopoda (Myriapoda)

Answer 8

• Centipedes
• Carnivorous
• One pair of jointed legs per segment

Question 9

Subphylum Hexapoda

Answer 9

• Six legged

Question 10

Class Insecta (Hexapoda)

Answer 10

• Consistent Tagmentization; head; one pair of antenna; thorax; three pairs of jointed wings and legs; abdomen; without paired jointed appendages
• Synapomorphic wings
• Compound eyes or ocelli (eye spots)
• Cerci; pair of segmented terminal appendages
• Complete / Incomplete metamorphosis
• Indirect sexual reproduction via spermatophore (sperm package)
• Shed cuticle

Question 11

Subphylum Chelicerata

Answer 11

• Horseshoe crabs, arachnids
• No antenna
• Uniramous limbs
• Chelicerae mouthparts
• Cephalothorax; chelicerae, pedipalps, four pairs of legs
• Abdomen

Question 12

Class Xiphosura (Chelicerates)

Answer 12

• Horseshoe craps
• Compound eyes
• Book gills

Question 13

Class Arachnida (Chelicerates)

Answer 13

• Spiders, mites, etc
• Simple eyes
• Fluid feeding predators

Question 14

Order Araneae (Arachnida)

Answer 14

• Spiders
• Spinnerets
• Poison glands
• Produce silk
• Maternal care

Question 15

Order Acari (Arachnida)

Answer 15

• Mites
• No separation of cephalothorax and abdomen
• No segmentation
• Detritovores