In this article we will discuss about the General Characters and Classification of Phylum Annelida. General Characteristics of Phylum Annelida: Some of the general characters of Phylum Annelida are listed below: 1. Habitat: Annelids occur in fresh water, sea water or moist soil. Some are free living, some are burrowing and a few are parasitic. 2. Metameric Segmentation: The annelids [...]
In this article we will discuss about of Polygordius:- 1. External Structures of Polygordius 2. Body Wall and Coelom of Polygordius 3. Digestive System 4. Circulatory System 5. Excretory System 6. Nervous System 7. Reproductive System. External Structures of Polygordius: The body of polygordius is slender, elongated, cylindrical and measures about 2-10 cm in length (Fig. 17.41). The segmentations are [...]
In this article we will discuss about Trochophore Larva:- 1. Historical Retrospect of Trochophore Larva 2. Structures of the Trochophore Larva 3. Biology and Metamorphosis 4. Structures 5. Affinities 6. Phylogenetic Significance. Historical Retrospect of Trochophore Larva: 1. Loven (1840), a Swedish naturalist, was the first man who discovered trochophore larva. Since then the larva was known as Loven's larva. [...]