SPONGES SPONGES Spongia officinalis Gold Sponge Aplysina aerophoba

SPONGES

SPONGES Spongia officinalis Gold Sponge (Aplysina aerophoba) - one of the simplest animals→ their bodies are not organized in organ systems or even tissues (made up of a grouping of cells that work together)

Students in charge Take 3 trays. EACH TRAY NEEDS TO CONTAIN: § ~ 9 slides § Cover slips (in their container) § ~ 9 needles § 50 m. L beaker filled with 20 m. L of tap water § 3 droppers § 3 tweezers Place the trays on the last 3 tables (last one in each row). Give each group a microscope. Other students 5 groups (2 oval tables + 3) Form 3 other groups (put 2 desks together) Take and plug in 1 extension cord TO EACH of the 3 groups (for the microscope).

TASK – 5 groups Microscopy of the sponge's skeleton PROCEDURE: Use the last 3 tables(last one in each row) to prepare the slides. The desks can seat two people (from different groups). Then bring your slides to your group table. A) Prepare a slide with spongin fibers, do the microscopy of your slide, and draw (use a PENCIL) what you see in your field of view. B) Prepare a slide with spicules, do the microscopy of your slide, and draw (use a PENCIL) what you see in your field of view.

Where do they live? Nutrient intake and digestion https: //www. youtube. com/watch? v=BW 05 v. Mziy 2 o https: //www. youtube. com/watch? v=p. TZ 211 c. Ij. X 8

~4 min Label: EPIDERMIS: PINACOCYTE, POROCYTE PORE, SPONGOCOEL, MESOHYL: AMOEBOCYTE, SPICULE, ENDODERMIS: CHOANOCYTE, OSCULUM

EPIDERMIS: PINACOCYTE POROCYTE, POROCYTE PORE, SPONGOCOEL, MESOHYL: AMOEBOCYTE, SPICULE, ENDODERMIS: CHOANOCYTE, OSCULUM pores POROCYTE

NUTRIENT INTAKE AND DIGESTION. Labet the choanocyte (CHOANOCYTE, AMEBOCYTE, FLAGELLUM, PHAGOCYTOSIS, FOOD PARTICLES) and write the explanation of its role.

Draw the direction of water flow in both drawings.

Gas exchange

Movement?

Sponges reproduce either asexually or sexually: 1. Asexuall reproduction (without eggs and sperm) often occurs by: a) budding b) fission c) A gemmule is a small, encysted bud that can tolerate being dried out for a long period of time. Freshwater sponges can produce this “resting” stage called a gemmule. When the gemmule is exposed to water, it can resume development as a sponge. 2. Sexuall reproduction when specialized gametocyte cells produce sperm and eggs. Look at the drawing of sexual reproduction and describe what you see.

Asexuall reproduction

Regeneration!

Sexuall reproduction

The most famous glass sponge is a species of Euplectella, shown here in the northwestern Gulf of Mexico, commonly called the “Venus flower basket”. Classes: 1. Demospongiae (the most diverse, containing 90 percent of all living sponges) 2. Hexactinellida (the rare glass sponges) 3. Calcarea (calcareous sponges) https: //oceanservice. noaa. gov/facts/glass-sponge. html Systematic categories of sponges: