2Phylum ArthropodaWhat percentage of animals belong to the Phylum Arthropoda?2/3, 67%List some examples of arthropods:Lobsters, crabs, spiders, and insects
3Phylum Arthropoda Like annelids, arthropods are segmented animals. Body segments bear jointed extensions called appendages such as legs and antennae.What does “arthropod” mean?Jointed foot
4Phylum ArthropodaDescribe the exoskeleton of arthropods. What is the function of each layer of the exoskeleton?Outer layer: repels water and helps prevent dessicationMiddle layer: provides the primary protectionInner layer: provides flexibility at the joints
5Phylum Arthropoda What is a compound eye? What is molting? An eye composed of many individual light detections, each with its own lensWhat is molting?The process by which an arthropod sheds its exoskeleton and develops a new one.
6Phylum ArthropodaIdentify the difference between chelicerae and mandibles.Chelicerae-pincerlike mouth partsMandibles- jawlike mouth partsWhat are the five main subphyla of arthropods?Trilobita, Crustacea, Chelicerata, Myriapoda, and Hexapoda
7Subphylum CrustaceaWhat 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.
8Subphylum CrustaceaWhat is the most important role of copepods in marine ecosystems?Abundant in the plankton and serve as a food sourcesWhat are some examples of terrestrial crustaceans?Sow bugs and pill bugsWhy do terrestrial crustaceans only live in moist environments?They lack adaptations for conserving water
9Subphylum Crustacea Crayfish What are the functions of the mandibles and chelipeds on a crayfish?Mandibles are used for chewingChelipeds 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.
10Subphylum Crustacea 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.
14Subphyla Chelicerata and Myriapoda 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
15Subphyla Chelicerata and Myriapoda Describe the functions of pedipalps:Aid in holding food and chewingIn spiders, they transfer sperm from the male to the female’s seminal receptacle.
16Subphyla Chelicerata and Myriapoda 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.
17Subphyla Chelicerata and Myriapoda Name two ways in which scorpions differ from spiders:Scorpions have large pincerlike pedipalps and a stinger at the end of their abdomen
18Subphyla Chelicerata and Myriapoda 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.
19Subphyla Chelicerata and Myriapoda 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.