The term Porifera was coined by Robert Grant. Study of poriferans is called Parazoology. VVI Examples of Phylum Porifera for Entrance Exams of Nepal: Sycon (Urn sponge or Crown sponge), Leucosolenia, Grantia Hyalonema (Glass rope sponge), Euplectella (Venus flower basket) Pheronema (Bowl sponge) Euspongia (Bath sponge), Spongilla (Freshwater sponge) Cliona (Boring or Sulphur sponge) Chalina (Mermaid's gloves) General characteristics of Phylum Porifera · First multicellular animals placed under the group Parazoa. · Aquatic and sessile. But their larvae are free-swimming form. · Asymmetrical or radially symmetrical. · Body is porous. The pores are of two types: small minute inhalant pores are called Ostia while large exhalant pore is called Osculum. · Body is diploblastic . The outer layer is called the dermal layer or Pinacoderm. It consists of Pinacocytes and Porocytes. The inner layer is called Choanoderm. It consists of Choanocytes or Collared f...