Monday/Wednesday March 8/10 Daily Learning Objective: Students will understand the basic characteristics of the Phylum Mollusca.

Agenda and Homework Agenda 1)Review Phylum Porifera – Annelida – get a white board and marker. 2)Introduce Phylum Mollusca – get as far as we can get Homework 1) Research grid and work cited for Vertebrate Project due on Friday 3/12. If you have Tuesday lab bring this to work on during lab.

Mollusks in March » Class Gastropoda- » stomach foot » Class Bivalvia- » Two Valves Class Cephalopods- head foot

Watch this video from Planet Earth At over 300 times the pressure of our atmosphere, how can octopi and other animals survive at such extreme depths? Why do they not implode?

Mollusks in General  Symmetry- Mollusks are bilateral, except for snails which are asymmetrical because of their shell  Body Openings- They all have two body openings- mouth and anus Nautilus shell cut in half- notice the chambers that are grown as the nautilus gets older

Bivalves Here is a video clip showing movement in a scallop. Here is a video clip showing movement in a scallop. A giant clam can be over 4 feet across and weigh 400 pounds!  Examples are clams, oysters, scallops  They are filter feeders where they will pull water in and filter out food, mainly bacteria  They have separate sexes with external fertilization.  Their two shells are held closed by two strong muscles.

Gastropods Interesting/ Unique Extras – Escargot is a delicacy of prepared snails, mainly in Europe – They eat by a scraping tongue called a radula  Examples include snails and slugs  All land snails are hermaphroditic- having both male and female reproductive parts  After mating, an egg mass is laid, usually underneath bark or in the soil itself  Snails will dissolve in salt because of the salt being hypertonic so all of the water diffuses out of them.

Cephalopod One of the most intelligent of all invertebrates One of the most intelligent of all invertebrates Cephalopods can change color better than a chameleon. Cephalopods can change color better than a chameleon. Use jet propulsion and tentacles for movement. Are able to go onto land for short periods of time Are able to go onto land for short periods of time o Reduced shell in most (nautilus) o Separate sexes Separate sexes o Most have camouflage for escaping or hunting