The following points highlight the three main classes of Phylum Porifera. The three classes are: 1. Calcarea or Calcispongiae— (Calcareous Sponges) 2. Hexactinellida or Triaxonida or Hyalospongiae—(Glass Sponge) 3. Demospongiae. Phylum Porifera: Class # 1. Calcarea or Calcispongiae— (Calcareous Sponges): [Calcarea, L. Calcarious = limy, Calcispongiae, L. Calcis = genitive of calx = lime or chalk] Features: (i) Exclusively marine, [...]
In this article we will discuss about Sycon:- 1. Habit and Habitat of Sycon 2. Structure of Sycon 3. Canal System 4. Physiology of Water Current Production 5. Microscopic Organisation 6. Nutrition, Respiration and Excretion 7. Reproduction 8. Development. Contents: Habit and Habitat of Sycon Structure of Sycon Canal System of Sycon Physiology of Water Current Production in Sycon Microscopic [...]
In this article we will discuss about Scypha:- 1. History of Scypha 2. Habit, Habitat and Distribution of Scypha 3. External Features 4. Canal System 5. Histology 6. Skeleton 7. Water Current 8. Nutrition 9. Respiration 10. Excretion 11. Nervous System and Behaviour 12. Reproduction. History of Scypha: Scypha (Gr., skyphos = cup) was formerly called Sycon. According to de [...]