Phylum Arthropoda animals with jointed appendages
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Transcript of Phylum Arthropoda animals with jointed appendages
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Phylum Arthropoda animals with jointed
appendages
• includes insects, crustaceans, centipedes, millipedes, and arachnids
• exoskeleton made of chitin• must shed shell to grow
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Chelicerates
• Includes spiders, ticks, scorpions, horseshoe crabs, and sea spiders– Six pairs of appendages– One pair of chelicerae (for feeding)
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Horseshoe crabs
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Sea spiders
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Mandibulates
• Crustaceans– Decapods
• Crabs, lobsters, shrimp
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Durban Dancing Schrimp
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Crustaceans• The crustaceans are a large group
of arthopods–Lobsters–Crabs–Shrimp–Crawfish–Barnacles–copepods– The majority are aquatic, living in
either freshwater or marine environments,
– Some are terrestrial
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Crustaceans Continued
• The majority move about independently• a few are parasitic and live attached to
their hosts– Sea lice, fish lice, whale lice (crustacean lice)
• adult barnacles live a sessile life — they are attached head-first to the substrate and cannot move independently.
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Sea lice are parasitic
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Structure of crustaceans • Crustaceans have three distinct body
parts: – head, thorax and abdomen
• the head and thorax may fuse to form a cephalothorax
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Structure continued
• The head has two pairs of antennae, one pair of compound eyes and mouthparts– Mandibles– maxillae
• Each body part usually has a pair of appendages– chelipeds– Walking legs– swimmerets
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Molting
• Like other arthropods, crustaceans have a stiff exoskeleton which must be shed to allow the animal to grow or molt.
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Reproduction
• crustaceans all have a larval form known as the nauplius
• most crustaceans have separate sexes, in many decapods, the eggs are retained by the females until they hatch into free-swimming larvae.
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Crustaceans of the Gulf of Mexico
• Decapods – Shrimp– Crabs – Lobsters and
Lobsterettes– Hermit crabs – Squat crabs and Porcelain crabs
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Common Name of some species
American Spider Crab Sentinel Crab
Pebble Crab
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