The following points highlight the two main classes of phylum hemichordata. The classes are: 1. Enteropneusta 2. Pterobranchia. Class # 1. Enteropneusta: 1. Worm-like, sand-burrowing forms, range in length from 25 to 2,500 mm. 2. They are found in shallow waters, although some live at a depth of 4,500 metre. 3. Body divided into proboscis, collar and trunk, the latter [...]
In this article we will discuss about the affinities of balanoglossus . Affinities # Balanoglossus with Annelida: Similarities: 1. Vermiform body. 2. Presence of coelom. 3. Arrangement of blood vessels. 4. Collar comparable to clitellum of Oligochaeta. 5. Resemblances between Tornaria and Trochophora larva. Dissimilarities: 1. Nephridia present in Trochophore but absent in Tornaria. 2. Gastrulation opposite—blastopore forms mouth in [...]
In this article we will discuss about:- 1. Description of Balanoglossus 2. External Features of Balanoglossus 3. Digestive System 4. Blood Vascular System 5. Nervous System 6. Reproductive System 7. Tornaria Larva 8. Metamorphosis. Contents: Description of Balanoglossus External Features of Balanoglossus Digestive System of Balanoglossus Blood Vascular System of Balanoglossus Nervous System of Balanoglossus Reproductive System of Balanoglossus Tornaria [...]