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Kingdom Animalia Phylum Arthropoda. Arthropods. “joint-foot” Have jointed appendages modified for different functions Largest phylum of animals. Exoskeleton. Hard , protective exterior skeleton Made of protein & chitin Flexible for joint movement - PowerPoint PPT Presentation
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Kingdom AnimaliaPhylum Arthropoda
Arthropods• “joint-foot”• Have jointed appendages modified for
different functions• Largest phylum of animals
Exoskeleton
• Hard, protective exterior skeleton• Made of protein & chitin• Flexible for joint movement• Doesn’t grow w/ animal, must shed old to
produce new= molting• Limits size of arthropods• Highly developed nervous system
Cicada Moulting
Subphylum- Crustaceans
• Include barnacles, krill, shrimps, lobsters, crabs
• 3 main body regions– Head– Thorax– Some have fused head/thorax = cephalothorax– Abdomen
• Each body segment has pair of appendages
Crustaceans, cont’d
• Appendages include:– Sensory antennae– Mandibles/maxillae: for feeding– Walking legs– Legs modified for swimming, reproduction, feeding, and
defense• Gas exchange through body or using gills• Vary in reproduction• Most have separate sexes• Most fertilization internal
Types of Crustaceans• Krill– Pelagic, shrimp-like animals– 3-6 cm long– Filter-feeders, feed primarily on zooplankton– Most bioluminescent– Extremely important feed animal. Primary food of
several whale species
OM NOM NOM
• Barnacles– Sessile (don’t move)– Can cause problems for ships by attaching to
hulls & causing increased friction– Some attach to whales and large fish
More Crustaceans
• Decapods (“ten feet.”)• Shrimps, lobsters, crabs• Largest in number & size• 5 pairs walking legs usually w/ claws on first• Shrimps & lobsters: distinct & elongate
abdomens• Crabs: small abdomen, broad cephalothorax,
highly mobile
Chelicerates-Subphylum• Include spiders, ticks, scorpions, horseshoe crabs
Horseshoe Crabs• Not true crabs• Live in shallow coastal
waters• 3 parts to body:– Cephalothorax-largest part of
body, obvious appendages– Abdomen-smaller, contains
gills– Telson- long spike, used for
steering & defense• Can walk or swim• Males smaller than females
6 pairs of appendages
Chelicerae(ka-LIS-er-ree): modified for feeding, replaces mouthparts