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Biology.  What percentage of animals belong to the Phylum Arthropoda? ◦ 2/3, 67%  List some examples of arthropods: ◦ Lobsters, crabs, spiders, and.

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Presentation on theme: "Biology.  What percentage of animals belong to the Phylum Arthropoda? ◦ 2/3, 67%  List some examples of arthropods: ◦ Lobsters, crabs, spiders, and."— Presentation transcript:

1 Biology

2  What percentage of animals belong to the Phylum Arthropoda? ◦ 2/3, 67%  List some examples of arthropods: ◦ Lobsters, crabs, spiders, and insects

3  Like annelids, arthropods are segmented animals.  Body segments bear jointed extensions called appendages such as legs and antennae.  What does “arthropod” mean? ◦ Jointed foot

4  Describe the exoskeleton of arthropods. What is the function of each layer of the exoskeleton? ◦ Outer layer: repels water and helps prevent dessication ◦ Middle layer: provides the primary protection ◦ Inner layer: provides flexibility at the joints

5  What is a compound eye? ◦ An eye composed of many individual light detections, each with its own lens  What is molting? ◦ The process by which an arthropod sheds its exoskeleton and develops a new one.

6  Identify the difference between chelicerae and mandibles. ◦ Chelicerae-pincerlike mouth parts ◦ Mandibles- jawlike mouth parts  What are the five main subphyla of arthropods? ◦ Trilobita, Crustacea, Chelicerata, Myriapoda, and Hexapoda

7  What characteristics are shared by most or all crustaceans? ◦ Have two pairs of antennae and paired appendages (some branched). ◦ Most have mandibles and a nauplius larva.

8  What is the most important role of copepods in marine ecosystems? ◦ Abundant in the plankton and serve as a food sources  What are some examples of terrestrial crustaceans? ◦ Sow bugs and pill bugs  Why do terrestrial crustaceans only live in moist environments? ◦ They lack adaptations for conserving water

9  Crayfish ◦ What are the functions of the mandibles and chelipeds on a crayfish?  Mandibles are used for chewing  Chelipeds are used for capturing food and defense. ◦ What structural adaptations of crayfish promote effective respiration in water?  Walking and branches of maxillae circulate water over the gills.

10 ◦ Crayfish (continued): ◦ Describe the type of circulation found in a crayfish.  Open circulatory system; the heart pumps hemolymph into several large vessels. Hemolymph then enters the spaces w/in the body where it bathes the tissues. Hemolymph returns to the gills where it exchanges O2 and CO2. Then, the hemolymph returns to the heart.

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14  List the major characteristics of arachnids: ◦ Have a cephalothorax and abdomen. ◦ Cepalothorax usually has 6 pairs of jointed appendages:  Chelicerae, pedipalps, and 4 pairs of walking legs

15  Describe the functions of pedipalps: ◦ Aid in holding food and chewing ◦ In spiders, they transfer sperm from the male to the female’s seminal receptacle.

16  Describe three ways in which spiders are adapted to catching prey: ◦ Some spiders spin webs to trap prey. ◦ They also have chelicerae modified as fangs that inject venom. ◦ Spiders can also immobilize their prey by wrapping them in silk.

17  Name two ways in which scorpions differ from spiders: ◦ Scorpions have large pincerlike pedipalps and a stinger at the end of their abdomen

18  How do mites and ticks differ? ◦ Mites are usually less than 1 mm in length, while ticks are a few millimeters to 3cm in length. Mites can be free living, but ticks can only be parasites.

19  How do millipedes and centipedes differ? ◦ Millipedes are herbivorous, have rounded bodies, and have two pairs of legs on most segments. ◦ Centipedes are carnivorous, have flattened bodies, and have one pair of legs on most segments.


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