Phylum Arthropoda Subphylum Trilobita Subphylum Chelicerata.
Crustaceans Subphylum Crustacea. Typically have: 2 Pairs of antennae 2 body sections (sometimes 3)...
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Transcript of Crustaceans Subphylum Crustacea. Typically have: 2 Pairs of antennae 2 body sections (sometimes 3)...
![Page 1: Crustaceans Subphylum Crustacea. Typically have: 2 Pairs of antennae 2 body sections (sometimes 3) Chewing mouth parts called mandibles.](https://reader035.fdocuments.us/reader035/viewer/2022062305/5697bf9d1a28abf838c938a2/html5/thumbnails/1.jpg)
CrustaceansSubphylum Crustacea
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Typically have:2 Pairs of antennae2 body sections (sometimes 3)Chewing mouth parts called mandibles
![Page 3: Crustaceans Subphylum Crustacea. Typically have: 2 Pairs of antennae 2 body sections (sometimes 3) Chewing mouth parts called mandibles.](https://reader035.fdocuments.us/reader035/viewer/2022062305/5697bf9d1a28abf838c938a2/html5/thumbnails/3.jpg)
Abdomen CephalothoraxCarapace
Antenna (2nd)
Cheliped with claws
Walking legs
Swimmerets
1st pair of antennae
Tail
(1st pair of legs)
(Fusion of head + thorax)
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•Carapace covers the cephalothorax.•Protects the gills
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Appendages:
Have different functions:Walking, Sensing the environment, Feeding, Defending against predators, Attracting mates
1st pair:Chelipeds – usedfor collectingand manupilatingfood (catch, pick up,crush, cut)
• Decapods – 5 pairs of legs (Deca = 10)
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Fiddler crabs – Male crabs useits large claw toattract females
Some hermit crabs use the clawsto block the entrance of the shell
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• 4 Pairs of walking legs
• Swimmerets -
Used for swimming and reproduction(males for transfer of sperm, females to holdEggs and young)
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Male
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Groups of Crustaceans:
1. Decapods: •Primarily live in saltwater environments.•5 Pairs of appendages•Fused body segments – Cephalothorax andabdomen
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• Antennae – Have sensory hairs – used forsensing the environment. (Crayfish mainly)Other crustaceans – Swimming and Filter feeding
• Mandible – mouthpart used for biting andchewing
• Tail – paddle-like appendages fused with last segment
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2. Barnacles:
• Sessile• Carapace similarto mollusk mantle, secretes a calcium shell• Feed by sweeping food into its mouth with feet
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3. Isopods
• Seven pairs of legs• Most are marine and freshwater scavengers• Pill bugs and Wood lice (terrestrial)
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4. Tongue worms:
• Parasitic• No eyes, mandibles or antennae.• Have lost most of their limbs
http://www.pbs.org/wgbh/nova/nature/tongue-parasite.html