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Biodiversity

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 Arthropoda

Triploblastic

Bilaterally-symmetrical

SegmentedChitinous exoskeleton

Jointed appendages

Open circulatory system

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Insecta

Habitat – mainly terrestrial Body divisions – head, thorax & 

abdomen Appendages Antennae – 1 pair mouth parts – mandibles & maxillae legs – 3 pairs on thorax

Eyes–

compound eyes & simple eyes Gas exchange – tracheae in adults Eg. Periplaneta (cockroach)

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Insecta - Periplaneta (cockroach)

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 Arachnida

Habitat – mainly terrestrial Body divisions – prosoma (anterior section,

consists of the fused head and thorax and bearappendages) & opisthosoma (posterior section,consists of those body segments that do notbear legs)

Appendages Antennae - none mouth parts – chelicerae & pedipals

legs–

4 pairs on cephalothorax Eyes – simple eyes Gas exchange – book lungs or tracheae Eg.Lycosa (spider)

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Crustacea

Habitat – mainly aquatic Body divisions – cephalothorax & 

abdomen Appendages Antennae – 2 pairs mouth parts – mandibles & maxillae legs – typically 1 pair persegment

Eyes–

1 pair of stalked compound eyes Gas exchange - gills Eg. Penaeus (prawn)

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Chilopoda

Habitat - terrestrial Body divisions – head with segmented

body Appendages Antennae – 1 pair mouth parts – mandibles & maxillae legs – 1 pair per segment

Eyes–

simple, compound or absent Gas exchange - tracheae Eg. Lithobius(centipede)

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Diplopoda

Habitat - terrestrial Body divisions – head with segmented

body Appendages Antennae – 1 pair mouth parts – mandibles & maxillae legs – 2 pairs per segment

Eyes–

simple eyes Gas exchange - tracheae Eg.Lulus (millipede)

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Merostomata

Habitat – marine or shore-living Body divisions – cephalothorax & 

abdomen Appendages Antennae - none mouth parts – chelicerae & pedipals legs – 4 pairs

Eyes–

simple eyes Gas exchange – book lungs/gills Eg. Limulus (horseshoe crabs)

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 Arthropoda Representative Animals

– Crustaceans, insects, spiders

Level of organization– system

Symmetry– bilateral

Digestion– Complete digestive tract

Circulation– Open system

Gas Exchange– Tracheae in insects; gills in crustaceans; book

lungs or tracheae in spider group

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 Arthropoda Waste disposal

– Malpighian (nephron in the kidney) tubules ininsects; antennal (green) glands incrustaceans

Nervous system– Brain; double ventral nerve cord; well-

developed sense organs

Reproduction– Sexual;sexes separate

Support and movement– Tough exoskeleton; jointed appendages (some

have wings); well-developed muscles

Environment & lifestyle– Marine, freshwater, and terrestrial; herbivores,

carnivores, scavengers

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Mollusca

Ventral muscular foot

Body organs are concentrated abovethe foot

Mantle (heavy fold of tissue)wrapped around the visceral (theinternal body organs) mass andoverhangs.

An open circulatory system

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Gastropoda

Asymmetricall body

Radula (a tonguelike organ) forfeeding

Terrestrial forms have lungs

Internal fertilization

Eg. Helix (Snail)

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Mollusca

Representative Animals– Snail, octopus

Level of organization– system

Symmetry– Asymmetrical, Bilateral

Digestion– Complete digestive tract

Circulation– Open system (closed in cephalopods)

Gas Exchange– Gill

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Mollusca

Waste disposal– Metanephridia (excretory organ, consists of a simple

tube with cilia at the inner end)

Nervous system

–Three pairs of ganglia; simple sense organs

Reproduction– Sexual;sexes separate; fertilization in water

Support and movement– Most have hydrostatic skeleton; most have ventral foot

for locomotion

Environment & lifestyle– Mainly marine, some inhabit fresh water or are

terrestrial; herbivores, carnivores and scavengers

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Chordata

A notochord

A hollow nerve cord

A tailvertebrates

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Class of Chordata

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Chordata Nervous system

–Dorsal nerve cord with brain at anterior end

Reproduction

– Sexual; sexes separate

Support and movement– Notochord; endoskeleton of cartilage and/or

bone; well-developed muscles

Environment & lifestyle

–Diverse habitats and lifestyle; herbivores,carnivores, omnivores, scavengers (an animalthe feeds on dead organic matter)