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 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 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…
THE EXOSKELETON Arthropods have an external jointed skeleton. it is composed of cuticle. Exoskeleton encloses the arthropods. The exoskeleton is major reason or the success of arthropods. Exoskeleton performs following…
METAMERISM AND TAGMATIZATION Three characteristics have contributed in the success of arthropods. One of is metamerism. Metamerism of arthropods is apparent externally. The arthropod body is composed of a similar…
THE ARTHROPODS BLUEPRINT OF SUCCESS EVOLUTIONARY PERSPECTIVE Diversity among copepods: The species of copepods have greatest number of individuals. The size of copepod is 1 to 2 mm. These are…
OBJECTIVES Multiple Choice Questions MCQs 1.Tubifex belongs to: (a) Oligochaeta (b) Hirudinea (c) Polychaeta (d) none 2. Leech belongs to: (a) Oliuochaeta (b) Hirudinea (c) Polychaeta …
SUBJECTIVE QUESTIONS What is the observation of Miller about Samoan pablo worm? Give characteristics of phylum Annelida. Discuss relation ship of Annelida with other phylum. Write note on segmentation and…
DEFINITIONS AND KEY POINTS FOR OBJECTIVES TERMS DEFINITIONS Metamerism Segmental arrangement of body parts in an animal is called metamerism. Tagmatization The specialization of body regions in a metameric animal…
FURTHER PHYLOGENETIC CONSIDERATIONS 1. Traditional interpretation It suggests that the ancestral polychaetes gave rise to modern polychaetes through adaptive radiation. Then a group of annelids adapted in freshwater. The fresh…
saadia