Terminology Section 546-547 1) Except for sponges, all other animals have true tissues. 2) Glass sponges (Silicea group) are characterized by a skeleton containing silica spicules and live mainly in deep water environments. 3) Members of Calcarea group possess spicules composed of calcium carbonate and live in shallow waters. 4) The filter feeding cells of sponges are chaoanocytes . 5) Sessile: A characteristic of animals which are not able to move about. They are permanently attached to a solid substrate of some kind. 6) Hermaphrodites: Organisms which possess both the male and female gonads. 7) Sponges function as one gender before switching to the other gender to avoid self fertilization. 8) Amoebocytes: Special cells that engulf and digest food, transport nutrients through the sponge body and manufacture skeletal fibres. 9) Water is drawn through incurrent pores on the central spongocoel before exiting out the osculum . 10)
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