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Kingdom: Animalia Phylum: Mollusca Body Plan: Two Main Regions *Head*Foot mouthLarge muscle used sensory organsfor locomotion *Visceral mass contains heart,

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Presentation on theme: "Kingdom: Animalia Phylum: Mollusca Body Plan: Two Main Regions *Head*Foot mouthLarge muscle used sensory organsfor locomotion *Visceral mass contains heart,"— Presentation transcript:

1 Kingdom: Animalia Phylum: Mollusca Body Plan: Two Main Regions *Head*Foot mouthLarge muscle used sensory organsfor locomotion *Visceral mass contains heart, organs of digestion, excretion, and reproduction *Mantle - layer of epidermis covering the visceral mass

2 Phylum: Mollusca Class: Gastropoda Stomach Foot Conch, snails, abalones (single shell) Slugs and nudibranchs (no shell) Open Circulatory System – no blood vessels –Organs are bathed in blood Torsion: during larval development the visceral mass twists around 180 degrees *allows animal to withdraw inside shell as an adult

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4 mantle secretes calcium carbonate shell Protects gills Ganglia - paired clusters of nerve cells Radula - flexible, tongue-like strip of tissue covered with tough, abrasive teeth

5 Killer Cone Snail PJrrKk&list=PL355D512277EFFA06&inde x=78http://www.youtube.com/watch?v=zcBmM PJrrKk&list=PL355D512277EFFA06&inde x=78

6 Phylum: Mollusca Class: Pelecypoda Hatchet Foot Clams, oysters, and scallops Bivalves (two shells) Adductor muscles that open and close the shell Open Circulatory Filter feeders

7 Shell (consists of three layers) 1.Outer layer protects against acidity of water 2.Middle layer of calcium carbonate strengthens the shell 3.Inner prismatic layer protects the animals smooth body *Pearl - grain of sand between the mantle it gets coated with the inner layer

8 Clam Cilia on gills create water current –incurrent siphon –excurrent siphon Hinge Umbo Muscle Scars Mantle Scar Foot Visceral Mass - organs Gills Digestive Gland - green Pedipalps-reproductive organ

9 Clam vs. The World v6R2M&list=PL355D512277EFFA06&inde x=113http://www.youtube.com/watch?v=_KVFDf v6R2M&list=PL355D512277EFFA06&inde x=113

10 Phylum: Mollusca Class: Cephalopoda Free swimming, predatory existence Circle of tentacles with powerful suction cups Beak Brain - largest of all invertebrates Closed Circulatory System Chromatophores-pigment cells Head Foot Octopuses, squids,cuttlefish, and chambered nautilus

11 Squid Ten tentacles - longest two used for capturing prey Muscular mantle propels squid with jet propulsion The giant squid: Architeuthis may reach 43 feet Worlds 2 nd largest invertebrate Ink Sac Siphon Male/Female Pen (internal skeleton-remnant of shell) Beak

12 Colossal Squid Worlds Largest Squid Species: 46 feet

13 Sudden Death Cuttlefish XrSE&list=PL355D512277EFFA06&index =3http://www.youtube.com/watch?v=E-zodF- XrSE&list=PL355D512277EFFA06&index =3

14 Class: Cephalopoda Octopus eight tentacles jet propulsion more likely to crawl along bottom no shell Chambered Nautilus only cephalopod with external shell shell with gas-filled chambers for buoyancy

15 Octopus vs. Shark mIPKto&list=PL355D512277EFFA06&inde x=138http://www.youtube.com/watch?v=M09sd mIPKto&list=PL355D512277EFFA06&inde x=138

16 Kingdom: Animalia Phylum: Annelida Earthworms, leeches, etc. Segmented Worms

17 Characteristics Bilaterally symmetrical Segmented worms – allows for efficient movement (shortening & lengthening of the body) Setae – external bristles Parapodia – fleshy protrusions # of setae and presence or absence of parapodia divide the phylum into 3 classes

18 Class Oligochaeta “few bristles” Live in soil or in fresh water No parapodia Few setae on each segment Ex: earthworm

19 Earthworm: Lumbricus terrestris Nocturnal More than 100 segments Circular and longitudinal muscles Setae grip the ground

20 Feeding & Digestion Pharynx  esophagus  crop  gizzard  long intestine  anus Crop – temporarily stores food Gizzard – grinds soil up to remove nutrients Maintain fertility of soil Aerate soil and loosen soil

21 Closed circulatory system Ventral & Dorsal blood vessel Aortic arches – five pairs of muscular tubes Respiration Oxygen and carbon dioxide diffuse directly through the skin (moist) Excretion Nephridia – excretory tubules in each segment except first 3 and the last one

22 Chain of ganglia connected by a ventral nerve cord Several ganglia are fused in the anterior segments to form the cerebral ganglia (brain) process simple senses – light, touch, chemicals, moisture, T, and vibrations Reproduction Hermaphrodites (can’t fertilize own eggs) Clitellum – thickened region secretes mucus Sperm is secreted into the mucus and travels to the Seminal receptacles (stored)

23 Class Polychaeta “many bristles” Numerous setae & parapodia Parapodia function in gas exchange Antennae and specialized mouthparts Most live in marine habitats Some are free-swimming predators Others feed on sediment as they burrow for food

24 Class: Hirudinea (leeches) Live in calm bodies of fresh water or moist vegetation No setae; no parapodia Sucker at each end of their bodies used to attach to surfaces Some are parasitic – can secrete an anesthetic and an anticoagulant so they can feed on blood Can ingest 10X their own body weight

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