Arthropoda Practice Chapter 24 - PowerPoint Presentation

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Arthropoda Practice

Chapter 24

Class Arachnida

Ticks, mites,

scorpions, and

spiders

No antennae Two body regions: cephalothorax and abdomen Feeding appendages are chelicerae Most are carnivorous They hold the prey with chelicerae, and pour enzyme-rich salivary juices over the victim Digestion is mostly externalMost are terrestrial Black widow females tend to eat males after mating because males can only mate once and then die. It ensures the success of the offspring.

Class

Crustacea

Lobsters, crayfish, shrimp, and others Primarily aquatic Free-floating larval stage

Branched appendages:

Class

Chilopoda

Centi

means hundred,

pede means legs1 pair of legs per segment Usually shiny, reddish brown, less than 3 inches long Move rapidly, often found under logs; some in homes Can bite have poison claws- modified 1st pair of legs supposedly feels like a bee stingSouth American centipedes can be up to 1 ft in length with a painful and agonizing bite!

Class

Diplopoda

Millipedes

milli

means thousand, pede means legsMost feed on decaying matter Diplo means two, poda means feet, so two pair of legs per segment Generally harmless detritus feeders Some species can eject cyanide (poison), so be careful if traveling to South America

Merostomata

Horseshoe Crabs

Blue blood due to copper

Used to detect bacteriaUsed to kill bacteria resistant to antibioticsStudy the eyes for insight into human eyes

Class

Insecta

The insects are the

most numerous and diverse of all the groups of arthropods.Three body regions: head, thorax, abdomen

Three pairs of legsOne pair of antennaMany have wings