Metamerism and Tagmatization
saadiaMETAMERISM 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
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
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
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
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
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…
Class Hirudinea (hirdin, leech’) structure , characteristics & reproduction
CLASS HIRUDINEA (hirdin, leech') The class Hirudinea contains five hundred species of leeches. Most leeches are fresh water. Some are marine. Some are completely terrestrial. Leeches prey on small invertebrates…
Class Oligochaeta (oligos, few + chaete, hair)
CLASS OLIGOCHAETA (oligos, few + chaete, hair) The class Oligochaeta has over three thousand species. They are found throughout the world in freshwater and terrestrial habitats. A few oligochaetes are…
Class Polychaeta (Poly, many + chaise, hair)
CLASS POLYCHAETA (Poly, many + chaise, hair) Polychaeta is the largest of the annelid classes. Polychaetes are mostly marine. They are 5 to 10 en- long. They have more than…
Classification of Annelids
Phylum Annelida 1. Their body is metameric, bilaterally symmetrical, and wormlike. 2. They show protostome characteristics include spiral cleavage, trochophore larvae and schizocoelous coelom formation. 3. They have paired epidermal…