restricted access Arthropods
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Arthropods PHYLUM: ARTHROPODA (ar-THRAH-pih-duh) arthro, jointed; poda, foot Characteristics Size: Tiny to >4 in. (10 cm) Antennae: None to two pairs Mouthparts: Variable Eyes: Compound; usually present Wings: Present or absent Legs: Variable; jointed Miscellaneous: Possess an external skeletal system called an exoskeleton Habitat: Extremely variable Food: Extremely variable Arthropoda is the largest and most diverse phylum in the animal kingdom with an estimated 6 million species worldwide. These generally small creatures have a hard exoskeleton made of chitin that does not expand as they grow but must be periodically shed and replaced through a process known as molting. Arthropods also have paired, jointed appendages, including legs, antennae, and fingerlike projections, called pedipalps, near the mouth. The more common arthropods found in Texas include members of the arachnids, crustaceans, millipedes , centipedes, and insects. Their biological and ecological diversity is unmatched by any other group of organisms, and they consume an extremely diverse array of foods. Classes in the phylum Arthropoda Class Page Arachnids: Arachnida 32–39 Crustaceans: Crustacea 40 Millipedes: Diplopoda 41 Centipedes: Chilopoda 42 Insects: Hexapoda 43–197 03KattesAnthropods.indd 31 3/27/09 8:51:05 AM ...


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