1 / 20

Arthropods

Arthropods. Arthropods. Tang Hiu Man(22) 6S. Tang Hiu Man (22) 6S. Introduction. An  arthropod  is an invertebrate animal  having an  exoskeleton  (external skeleton), a segmented body , and jointed appendages （附屬肢體） Largest group of invertebrate( ＞ 1 million species)

upton
Download Presentation

Arthropods

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Arthropods Arthropods Tang Hiu Man(22) 6S Tang HiuMan (22) 6S

  2. Introduction • An arthropod is aninvertebrateanimal having an exoskeleton (external skeleton), a segmented body, and jointed appendages（附屬肢體） • Largest group of invertebrate(＞1 million species) • Occupy ＞ 80% of all the animal species • Largest number of species • Has individuals occupying the greatest variety of habitats • consists of repeated segments, each with a pair of appendages

  3. Features • All consists of chitinous(角質素的) exoskeleton (cuticle) and jointed legs, some may have wings (eg. Butterflies, dragonflies) • Consists of repeated segments, each with a pair of appendages • Internal organs are also built of repeated segments • Highly versatile (enabled them to become the most species-rich animals in most environment ) • vision relies on various combinations of compound eyes

  4. 1.Crustaceans(甲殼) • Have biramous(二肢) appendages Shrimp crab Barnacle 藤壺 water flea

  5. 2.Myriapods(多足) • have many body segments, each bearing one or two pairs of legs.  centipede蜈蚣 millipede

  6. 3.Arachnids(蜘蛛類) • presence of chelicerae(螫肢), appendages just above / in front of the mouth. spider mite scorpion

  7. 4.Insects • with six thoracic legs Butterfly bee beetle dragonfly

  8. Cuticle(chitinous exoskeleton) • Reduce water lost by evaporation • Act as a protective layer against bacterial invasion & mechanical injury • Provide a rigid framework to support the body on land • The presence of joints between segments of legs allow rapid locomotion to take place • Provide large surface area for muscle attachment that produces force for locomotion • The thoracic(胸的) cuticle with wings to make flight possible • With colour for camouflage(保護色)

  9. Wings • They enable insects to fly so that: • Insects can get their food & escape from their enemies quickly, thus flight facilitates survival. • Insects can disperse themselves & thus reduce the problem of overcrowding.

  10. Jointed Legs • Allow walking • A pair of strong & muscular hind legs(後腿) allow rapid hopping(跳) for long distance during escaping from enemies or catching preys

  11. Small size • Reduce the competition for food & space • Reduce body weight to facilitate flight • Insects can easily hide themselves in crevices(縫隙)

  12. Recent News • 吃蟲救地球 • http://www.babynet.com.hk/content/%E5%90%83%E8%9F%B2%E6%95%91%E5%9C%B0%E7%90%83-%E5%A4%A7%E5%AE%B6%E9%83%BD%E4%BE%86%E5%90%83%E8%9F%B2%E6%95%91%E5%9C%B0%E7%90%83%E5%9C%96%E7%89%87

  13. Modification of Jointed Appendages • Jointed appendages can be modified • Can become many different structures for different functions • eg. appendages on head→ antennae(觸角), palps(觸鬚) for sensory functions • Appendages on thorax & abdomen(腹)→ walking, swimming, transferring sperms

  14. Tracheal system Gill Book lung

  15. Reproduction • terrestrial: internal fertilization • Aquatic : external fertilization except scorpion (lay eggs) A few: • have organs of both sexes (eg. barnacles) • Parthenogenesis(單性生殖)(reversible)

  16. Reference • http://en.wikipedia.org/wiki/Arthropod#Reproduction_and_development • http://www.google.com.hk/images • Advanced-level Biology for Hong Kong • AL Biology Book 3 Ecology

  17. ~The End~

More Related