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Arthropods and Echinoderms. Biology I: Chapter 28. ARTHROPODS. ARTHROPODS. Arthropods. Phylum Arthropoda Insects, crabs, centipedes, spiders Segmented body Tough exoskeleton made of chitin Jointed appendages. Evolution of Arthropods. Fewer body segments

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Arthropods and Echinoderms

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Arthropods and echinoderms

Arthropods and Echinoderms

Biology I: Chapter 28

Arthropods and echinoderms


Arthropods and echinoderms


Arthropods and echinoderms


Phylum Arthropoda

Insects, crabs, centipedes, spiders

Segmented body

Tough exoskeleton made of chitin

Jointed appendages

Arthropods and echinoderms

Evolution of Arthropods

Fewer body segments

Highly specialized appendages for feeding, movement and other functions

Arthropods and echinoderms

- movement strategies

Arthropods and echinoderms

Form and Function in Arthropods

Complex organ systems; some only found only in this phylum

Tracheal tubes (respiration)

Open circulatory system

Excrete wastes through saclike tubules

Arthropods and echinoderms


Herbivores, carnivores, omnivores, bloodsuckers, filter feeders, detritivores, and parasites

Mouthparts have evolved to allow them to eat anything imaginable

Pincers or fangs to sickle-shaped jaws that can cut through the tissues of captured prey

Arthropods and echinoderms







Arthropods and echinoderms

Respiration: Terrestrial Arthropods

Tracheal tube: one of many branching, air-filled tubes that extend throughout the body

Spiracle: small opening located along the side of the body through which air enters and leaves the body

Book lung: organ that has layers of respiratory tissue stacked like the pages of a book: used to exchange gases

Arthropods and echinoderms

Respire through feather-like gills (i.e. lobster and crabs)

The horseshoe crab respires through organs: book gills

Arthropods and echinoderms


Open circulatory system

Well-developed heart pumps blood through arteries that branch and enter the tissues

Blood leaves the blood vessels and moves through sinuses, or cavities

The blood recollects in a large sinus surrounding the heart

It reenters the heart and is again pumped throughout the body

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