Annelids and mollusks
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Annelids and Mollusks. Leech. Clam. Earthworm. Annelids. Annelida  Marine Sandworms, earthworms, and leeches (segmented worms) Classes Polychaetes -> Marine worms, fire worms, feather dusters Oligochaetes  earthworms Hirudinea  leeches. Annelids. Earthworm. Polychaete (Ragworm).

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Annelids and Mollusks

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Annelids and mollusks

Annelids and Mollusks

Leech

Clam

Earthworm


Annelids

Annelids

  • Annelida Marine Sandworms, earthworms, and leeches (segmented worms)

    Classes

  • Polychaetes -> Marine worms, fire worms, feather dusters

  • Oligochaetes  earthworms

  • Hirudinea  leeches


Annelids1

Annelids

Earthworm

Polychaete (Ragworm)

Leech


Reproduction

Reproduction

  • Mostly Sexual

  • Aquatic worms shed sperm and eggs into water

  • Earthworms & leeches are hermaphroditic (individuals fertilize each others eggs)

Earthworm Mating


Characteristics of annelids

Characteristics of Annelids

  • “Means tiny rings”

  • Have 5 characteristics of higher organisms

  • Bilateral symmetry

  • Cephalization

  • Tubular gut

  • Coelom

  • Segmentation


Segmentation

Segmentation

  • Allows organism to attain larger size

  • Each segment separated by a wall called a septum

  • Nephridia  found in each segment; removes excess water & wastes

  • Muscle in each segment contract sequentially for movement

  • Each segment contains nerve cords connected to the brain


Digestive system

Digestive System

  • 2 organs for Digestion

  • Crop -> stores food

  • Gizzard  grinds food


Mollusks

Mollusks

  • Includes snails, clams, oysters, scallops, Squid, and Octopus

  • Characteristics of Mollusks

  • 2nd most numerous phylum

  • Ceolomates allows for movement and digestion at same time

  • Trochophore Free swimming larval stage


Body plan of mollusks

Body Plan of Mollusks

  • Head-foot region  contains head (ganglia) and foot (muscle used for locomotion)

  • Visceral Mass contains heart + organs

  • Shell shell is made of Calcium carbonate;

  • Mantle epidermal layer that secretes Calcium carbonate; makes the shell

  • Ganglia Central Nerves behind mouth

  • Radula specialized tongue with teeth used for scraping algae or cutting plants


Head foot region

Head-Foot Region


Radula

Radula

Circular Rows of Moving Teeth


Gastropods

Gastropods

  • Includes Snails + Conch

  • Land snails are hermaphroditic; aquatic snails have separate sexes

  • Nudibranches “Naked gill” slugs… No shell


Snails and conch

Snails and Conch

Conch

Apple Snail

Burgundy Snail


Bivalvia

Bivalvia

  • Includes clams, oysters, and scallops

  • Most are filter feeders through tubes called siphons


Bivalves

Bivalves

Clams

Scallops

Oysters


Cephalopods

Cephalopods

  • Includes Octopus and Squid

  • Free swimming Mollusks

  • Advanced nervous system with distinct brain (largest invertebrate brain)

  • Chromatophores are epidermal pigment cells that release ink when threatened


Annelids and mollusks

Giant Squid Swimming Next to Diver


Cephalopods1

Cephalopods


Annelids and mollusks

Giant Pacific Octopus


Annelids and mollusks

Scary-Looking Octopus


Annelids and mollusks

I’m an Octopus!


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