16 Spongilla lacustris Megascleres And Microscleres
17 Spongilla lacustris Gemmules With Micropyle MycropyleSpicules
18 Spongilla lacustris Gemmoscleres Slightly Curved Amphistrongyla Covered With A Variable Number Of Recurved Spines
19 Sponge Reproduction OR! Sexual Eggs from amoebocytes and sperm from collar cells (or amoebocytes)Sperm is released into waterOva fertilized in mesohyl after sperm brought in by water currentHere, the zygote develops into a flagellated larvae: parenchymulaOR!
20 Fertilization The Smoking Sponges Mature sperm and oocytes are released into the environment through the aquiferous system.Fertilization takes place in the water (ovipery).
21 The Parenchymula larva is generally ciliated and solid.