Across
- 2. is a mobile cell (moving like an amoeba) in the body of invertebrates including echinoderms, molluscs, tunicates, sponges and some chelicerates.
- 4. (Mesenchyme) the gelatinous matrix within a sponge. The mesohyl resembles a type of connective tissue and contains several amoeboid cells such as amebocytes, as well as fibrils and skeletal elements.
- 7. a slender pointed usually hard body especially : one of the minute calcareous or siliceous bodies that support the tissue of various invertebrates (such as sponges).
- 8. tubular cells which make up the pores of a sponge known as ostia.
- 9. genus of marine sponges of the class Calcarea (calcareous sponges), characterized by a fingerlike body shape known as the syconoid type of structure.
- 10. (Pinacocyte) the epidermis is the layer of cells that covers the outer surface of the sponge. The thin, flattened cells of the epidermis are called pinacocytes.
- 12. a sponge of a grade of structure of the simplest type, in the form of a tube or bag lined with choanocytes.
- 14. the distinct from the botanical meaning of sessility, which refers to an organism or biological structure attached directly by its base without a stalk.
Down
- 1. a tough-coated dormant cluster of embryonic cells produced by a freshwater sponge for development in more favorable conditions.
- 3. a flagellated cell with a collar of protoplasm at the base of the flagellum, numbers of which line the internal chambers of sponges.
- 5. a sponge of the most complex structure, composed of a mass of flagellated chambers and water canals.
- 6. an excretory structure in the living sponge, a large opening to the outside through which the current of water exits after passing through the spongocoel.
- 11. Spongin gives a sponge its flexibility. True spongin is found only in members of the class Demospongiae.
- 13. (singular ostium) the pores in sponges through which water enters the body. any of the openings in the heart of an arthropod through which blood enters.