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Arthropods The Armored Achievers pp. 125-131. Arthropod Largest phylum with 1 million species (3/4 of all animals on earth) Segmented bilateral symmetry.

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Presentation on theme: "Arthropods The Armored Achievers pp. 125-131. Arthropod Largest phylum with 1 million species (3/4 of all animals on earth) Segmented bilateral symmetry."— Presentation transcript:

1 Arthropods The Armored Achievers pp. 125-131

2 Arthropod Largest phylum with 1 million species (3/4 of all animals on earth) Segmented bilateral symmetry Exoskeleton that must be molted in order to grow Jointed appendages Blood-vascular system Mostly internal sexual reproduction

3 subphylums

4 Uniramia - Class Insecta 3 pairs of legs largest & most diverse group on earth rarely in the sea but live at the waters edge Ex. Water strider

5 Subphylum Chelicerata

6 Class Merostomata Living fossils NW Atlantic, Gulf, Japan, Korea shallow, soft bottoms Ex. Horseshoe crab (Limulus polyphemus)

7 carapace mouth Inhalent current Exhalent current Repiratory chamber abdomen Book gills

8 Class Pycnogonida 1mm - 40cm pole to pole narrow body, proboscis, 4 very long legs males carry the eggs Ex. Sea Spiders

9 Subphylum Crustacea 35,000 species Primarily marine, some freshwater, semi terrestrial, terrestrial Use maxillae for filter – suspension feeding Gills – adapted to live in water 2 pair of antennae for sensory

10 Classes of Crustacea

11 Crustacean classes Subphylum Crustacea Class Maxillopoda Class Malacostraca

12 Class Maxillopoda Subclass Cirripedia Subclass Copepoda

13 Subclass Cirripedia Free-swimming larva Cement glands attach adult form to substrate (sessile) Hermaphroditic (long coiled penis) Ex. Barnacles

14 cement gland cirri

15 Subclass Copepoda Most abundant plankton, largest protein source (1 st level consumer) Most are free-swimming but some are parasitic First antennae long for drag Planktonic larva of many crustacean Ex. copepods

16 Class Malacostraca 14 segments + a telson contains over half of all known crustaceans

17 Orders of Malacostraca

18 Order Isopoda Bottom dwellers (deep to intertidal) Herbivorous scavengers Ex. Pillbugs on land, gribbles in ocean

19 Order Amphipod burrowing in sandy and muddy sediments usually flattened from side to side three pairs of short tail limbs are used to flick them out of danger

20 decapods 10 legs largest 5 pair of walking legs - 1st pair heavier with pinchers (cheliped) Ex. Crayfish, lobster, crab, shrimp

21 Callinectes sapidus


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