Lab 10&11: Molting Protostomes (Ecdysozoa)

Phylum Nematoda

Roundworms

Molt

Pseudocoelomate and complete digestive system

Dioecious

Free-living and parasitic

Longitudinal muscles for movement

Phylum Arthropoda

Jointed appendages and segmented

Complete digestive; coelomate

Exoskeleton of chitin

Molts

Subphylum Cheliceriformes

Cephalothorax and abdomen

Paired Chelicerae and pedipalps

4 pairs of legs

Class Merostomata

Class of Cheliceriformes

Contain Horseshoe crabs

Posses book gills and telson

Class Arachnida

Class of Cheliceriformes

Contain spiders, scorpions, mites, ticks, etc.

Spinnerets

Subphylum Myriapoda

Head and multisegmented trunk

One pair of antennae and mandibles

Legs on trunk

Appendages are unbranched

Possess tracheal respiratory system with spiracles

Class diplopoda

Class of subphylum Myriapoda

Millipedes

2 pairs of legs per trunk

Class Chilpoda

Class of subphylum Myriapoda

Centipedes

One pair of legs per trunk

Venom claws

Subphylum Crustacea

Barnacles, crayfish, crabs, lobsters, shrimp, etc.

**Two pairs of antennae**

paired mandibles

5 pairs of chelate appendages first pair used as claws

Has swimmerets

Biramous appendages

Subphylum hexapoda

Head thorax abdomen

One pair of antennae and mandibles

3 pairs of legs

2 pairs of wings

Uniramous appendages

Tracheal respiratory system with spiracles

Class insecta

Lower classification of subphylum hexapoda

Grasshopper and praying mantis

Phylum Echinodermata

Coelomate; unsegmented

Pentamerous radial symmetry

Water vascular system

Dermal endoskeleton with spines

Class Asteroidea

Class of Phylum Echinodermata

Five arms, madreporite, central disc, mouth, tube feet, adn coelom

Class Ophiuroidea

Class of Phylum Echinodermata

Five arms

Central disc

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Basket and Brittle stars

Class Echinoidea

Class of Phylum Echinodermata

Sea urchins and sand dollars

Pentamerous characteristics and jaws

Class Holothuroidea

Class of Phylum Echinodermata

Sea cucumbers

Tentacles at mouth

Cloaca and vent anus

Radial muscles and thick intestines (alimentary canal)

Respiratory trees

Phylum Arthropoda

Subphylum Cheliceriformes

Class Merostomata

Horseshoe crab

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Phylum Arthropoda

Subphylum Cheliceriformes

Class Arachnida

Scorpion

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Phylum Arthropoda

Subphylum Cheliceriformes

Class Arachnida

Garden spider

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Phylum Arthropoda

Subphylum Myriapoda

Class Diplopoda

Millepede

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Phylum Arthropoda

Subphylum Myriapoda

Class Chilopoda

Centipede

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Phylum Arthropoda

Subphylum Crustacea

Class Crustacea

Crayfish

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Phylum Arthropoda

Subphylum Crustacea

Class Crustacea

Crab

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Phylum Arthropoda

Subphylum Hexapoda

Class insecta

Praying mantis

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Phylum Arthropoda

Subphylum Hexapoda

Class insecta

Grasshopper

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Phylum Echinodermata

Class Ophiuroidea

Brittle star

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Phylum Echinodermata

Class Asteroidea

Sea star

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Phylum Echinodermata

Class Echinoidea

Sea urchin

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Phylum Echinodermata

Class Echinoidea

Sand dollar

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Phylum Echinodermata

Class Holothuroidea

Sea cucumber

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