1 / 10

Phylum Mollusca

Phylum Mollusca. General Characteristics:. Coelomates – true body cavity Bilaterial symmetry Most have external shell, foot, mantle, & visceral mass Mantle – thin layer of tissue that covers most of the body Visceral mass - internal organs. General Characteristics:. Feeding method:

lrickard
Télécharger la présentation

Phylum Mollusca

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Phylum Mollusca

  2. General Characteristics: • Coelomates – true body cavity • Bilaterial symmetry • Most have external shell, foot, mantle, & visceral mass • Mantle – thin layer of tissue that covers most of the body • Visceral mass - internal organs

  3. General Characteristics: • Feeding method: • Herbivores, carnivores, filter feeders, detritivores, or parasites • Radula – tongue-shaped structure used for feeding by snails and slugs • Respiration: • Aquatic - gills (oxygen & carbon dioxide diffuse) • Land – moist mantle cavity

  4. General Characteristics: • Circulation: • Open circulatory system – in slowing moving mollusks (snails, clams, etc) • Closed circulatory system – in faster moving mollusks (octopus, squid, etc) • Excretion: • Use nephridia

  5. General Characteristics: • Response: • Simple nervous system – small ganglia (two-shelled mollusks) • Complex nervous system – brain (octopus) • Movement: • Secrete mucus & move over surface using a rippling motion - snails • Jet propulsion - octopus

  6. General Characteristics: • Reproduction: • Sexual • Fertilize internally (those w/ tentacles) or externally (those w/ shells) • Some are hermaphrodites • Trochophore larva – free-swimming

  7. General Characteristics: • Habitat: • Marine or Terrestrial • Ecology: • Some photosynthetic • Provide habitats for other marine animals

  8. Class Bivalvia(2 shells w/ hinge) Mantle Muscular foot – used for digging Filter feed by siphoning water Visceral mass Shell Concentrated pollutants and microorganisms in their tissues  effect humans Siphons Ecologically these are used to monitor water quality Foot

  9. Class Gastropoda(stomach foot) Movement – use slimy muscular foot Visceral mass • General Information • Shell-less or single shell • Protection • Shell • Stay hidden • Squirt ink • Produce poison – bright colored bodies Mantle Shell Gut Head Foot Radula

  10. Class Celphalpoda(head foot) Tentacle Arm Visceral mass Head • General Characteristics: • “Foot” Divided into tentacles/arms • Small internal shells or none • Complex eyes • Highly developed brain Internal Shell Mantle Gut

More Related