Chapter 9 THE HEXAPODS AND MYRIAPODA
saadiaTHE HEXAPODS AND MYRIAPODA EOLUTIONARY PERSPECTIVE The insects are most successful animals. Zoologists have described approximately 750 100 species of insects. The actual number of insect species is 30 million.…
OBJECTIVES
OBJECTIVES Multiple Choice Questions: 1. The outer most layer of body of arthropods is: (a) Epiderrnis (b) Dermis (c) Hypodermis (d) Cuticle 2. The function of ridges and bar is…
SUBJECTIVE QUESTIONS
SUBJECTIVE QUESTIONS What is the importance of copepods in marine ecosystem? Give general characteristics of Phylum Arthropoda. What is common between Arthropods and Annelids? What arc the advantages of exoskeleton?…
DEFINITIONS AND KEY POINTS FOR OBJECTIVES
DEFINITIONS AND KEY POINTS FOR OBJECTIVES OF PHYLUM ARTHROPODS DEFINITIONS AND KEY POINTS FOR OBJECTIVES TERMS DEFINITIONS Schizocoelous coelom The coelom thrilled by the splitting of mesoderm is call Schizocoelous…
FURTHER PHYLOGENETIC CONSIDERATIONS
FURTHER PHYLOGENETIC CONSIDERATIONS The arthropods are very successful animals. They have diverse body forms. The lifestyles copepods, crabs, lobsters, crayfish, and barnacles demonstrate adaptive radiation. Few aquatic environments are without…
SUBPHYLUM CRUSTACEA (erustacea, hard shelled)
SUBPHYLUM CRUSTACEA (erustacea, hard shelled) The familiar members of the subphylum Crustacea are crayfish, shrimp, lobsters and crabs. Many others are lesser known but very common taxa. These include copepods,…
SUBPHYLUM CHELICERATA (chele, claw + ata, plural suffix)
SUBPHYLUM CHELICERATA (chele, claw + ata, plural suffix) The Chelicerata includes familiar animals like spiders, mites. and ticks. It also includes less familiar animals like horseshoe crabs and sea spiders.…
SUBPHYLUM TRILOBITOMORPHA (Tri, three + lobes, lobes)
SUBPHYLUM TRILOBITOMORPHA (Tri, three + lobes, lobes) Members of the subphylum Trilobitomorpha were dominant in the oceans from the Cambrian period (600 million years ago) to the Carboniferous period (345…
CLASSIFICATION
CLASSIFICATION Phylum Arthropoda 1. They show metamerism. It is modified by the specialization of body regions for specific functions (tagmatization). 2. Chitinous exoskeleton provides support and protection. It is modified…
METAMORPHOSIS
METAMORPHOSIS The radical change in body form and physiology from immature larval stage to adult is called metamorphosis. It is third most important characteristic of the arthropods. Metamorphosis reduces competition…