PORIFERA

1. Solitary- eg→ Spongilla

2. Inhalent pores- OSTIA Exhalent pores- OSCULA

3. Diploblastic

3.1. Derived from- 1. Ectoderm 2. Endoderm

4. Body wall → Three layer

5. Mesohyl cells → Non cellular layer →Found between Pinacocytes & Choanocytes

6. 1.-Archaeocytes→ Totipotent cells(Undifferentiated cells) 2.-Trophocytes→provide food to developing cells(nurse cells) 3.-Gland cells→secrete slimy substance 4.-collencytes→secrete spongin fibres of mesohyl cells 5.sceleroblasts→secrete spicules(in calcarious these are called calcoblast) 6.-Myocytes→Form a circular ring around the osculum and help in opening and closing of osculum 7.-Germ cell→produce sperm and ova and develop during breeding season 8.-Chromocytes→contain pigment granules and excretory substance 9.-Phagocytes→collect food from choanocytes through pseudopoda and also engulf excreta and damaged tissue

7. Central body cavity-spongocoel or paragastric cavity

7.1. Helps in→Nutrition → Excretion → Reproduction → Respiration

8. Classification

8.1. Calcarea or calcispongae-skeleton is of calcicus spicules -spicules are monaxons,triaxons or tetraxons -eg-Leucosolena,sycon,grantia

8.2. New Topic

9. Aquatic (mostly marine) (Rarely fresh wata eg. Spongilla)

10. Colonial- eg→

11. Asymmetrical (Radial Symmetry)

12. Cellular level of organisation

13. Pinacoderm- Outer cellular layer → Flattened pinacocytes → Oval porocytes

14. Choanoderm→ Consist flattened Cells called Choanocytes(Collar cells) → Inner cellular layer

15. Canal system 1.Asconoid type-simplest(LEUCOSOLENIA) 2.Syconoid type-more complex(SYCON) 3.Leuconoid type-most complex(SPONIGLA)also called rhagon type

16. Digestion-intracellular