Mollusks Phylum Mollusca. Advanced Invertebrates Phylum Mollusca Characteristics –1. Visceral Mass: soft bodied portion containing internal organs –2.

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Presentation transcript:

Mollusks Phylum Mollusca

Advanced Invertebrates Phylum Mollusca Characteristics –1. Visceral Mass: soft bodied portion containing internal organs –2. Foot: Strong muscular part used for locomotion –3. Mantle: Covering enveloping the visceral mass Over 112,000 different species

Class Gastropoda “Belly Foot” Snails Slugs Conches

Class Cephalopoda “Head Foot” Octopus Squid

Class Bivalvia Clams Oysters Scallops

Classification Common Name: Clam Scientific Name: Unio, Anodonta Phylum: Mollusca Class: Bivalvia Other: Class Pelecypoda “Hatchet Foot”

Major Characteristics Body Plan: Foot, Mantle, Visceral Mass Body Cavity: Visceral Mass contains all internal organs Symmetry: Bilateral Cell Specialization: Complex Organs, “Soft Bodied”

Life Support Processes Absorption: Intestines, Nephridia Feeding: Filter Feeder, Gills, Radula = flexible, tongue-like projection with teeth Digestion: Stomach, Intestines Respiration: Gills Circulation: Open System - Blood travels through sinuses, flows into pericardial cavity around heart, blood pigment is blue Hemocyanin

Life Support Processes Excretion: Anus = solids, Nephridia = remove liquid ammonia waste Secretion: The mantle secretes the shell Response: Ganglia, Ocelli (Primitive Eyespot), Statocysts = Balance Movement: Foot = burrow into ocean floor, Adductor Muscles = Opens shell when relaxed

Life Support Processes Reproduction: Separate sexes, Trochophore = larvae Support: Shell provides all protection

Ecological Relationships Sessile Pearl Formation = due to secretion of mantle Food for starfish

Body Systems Compared With Humans Digestive System Separate sexes Gonads

Advancements Over Previous Phylum Heart Gills Shell

The largest bivalve is the Marine Giant Clam that can reach a size of 50 in. in length and can weigh over 750 lbs.! The slowest growing animal of any kind is a deep sea clam which only grows.31 in every 100 years!

The largest known invertebrate is the Giant Squid Architeuthis dux. They can be over 60 ft. in length and weigh more than 4,000 lbs.! The largest eye in the animal kingdom belongs to the Giant Squid; over 16 in. in diameter! (About the size of a hubcap)