In this article we will discuss about Trilobites:- 1. Introduction to Trilobites 2. Habit and Habitat of Trilobites 3. Structure 4. Development 5. Affinities. Introduction to Trilobites: These groups of arthropods have no living members and are represented only by fossils. Altogether 19 genera are known to have had included nearly 4000 species. A fossil trilobite was first discovered in [...]
In this article we will discuss about Sacculina:- 1. History of Sacculina 2. Life History of Sacculina 3. Duration of Life Cycle 4. Effects of Parasitism. History of Sacculina: (i) Delage (1884) carried out many researches on Sacculina carcina. (ii) Among others, Smith (1906), Boschema (1931) worked on parasitic cirripeds. (iii) Smith (1910-1911) and Giard (1911- 1913) have shown that [...]
In this article we will discuss about True Crabs:- 1. Habit and Habitat of True Crab 2. External Structures of True Crab 3. Digestive System 4. Circulatory System 5. Respiratory System 6. Nervous System 7. Endocrine System 8. Moulting 9. Reproductive System 10. Life History. Contents: Habit and Habitat of True Crab External Structures of True Crab Digestive System of [...]