Download presentation
Presentation is loading. Please wait.
Published byAmice Carpenter Modified over 9 years ago
1
Mollusks Kingdom Animalia, Phylum Mollusca (means “soft”)
2
What is a Mollusk? ● Mollusks are extremely diverse! ● Soft body with internal or external shell ● Ex: snails, slugs, clams, squids, and octopi ● Trochophore larva
3
●Bilaterally symmetrical. ● Has a nervous system with a circum- oesophagal ring, ganglia and paired nerve chords. ● Has an open circulatory system with a heart and an aorta.
4
● Has gaseous exchange organs called ctenidial gills. ● Reproduce sexually
5
●Feed a wide range of material. ●Live in most environments. ●Despite their amazing diversity, all mollusks share some unique characteristics that define their body plan
6
● Body plan: ● Foot – takes on many forms ● Mantle – covers the body ● Shell – (present in most) ● Visceral mass – internal organs
7
●https://www.youtube.com/watch?v=ZGIQ2 sCgEmEhttps://www.youtube.com/watch?v=ZGIQ2 sCgEmE
8
Groups of Mollusks Three major classes of mollusks Gastropods Bivalves Cephalopods
9
Gastropod ● snails, slugs, and nudibranchs ● Shell-less or single shelled ● Move by a muscular foot ● Some are poisonous, bright colors
10
Snail
11
Spiral Mouth (radula)
12
●https://www.youtube.com/watch?v=u4QAn CFd4iwhttps://www.youtube.com/watch?v=u4QAn CFd4iw ●https://www.youtube.com/watch?v=Go_LI z7kTokhttps://www.youtube.com/watch?v=Go_LI z7kTok
13
Slug
14
●https://www.youtube.com/watch?v=W9EV a8p5b58https://www.youtube.com/watch?v=W9EV a8p5b58
15
Nudibranchs (sea slugs) Check out the nudibranch gallery at nationalgeographicnudibranch gallery at nationalgeographic
16
●https://www.youtube.com/watch?v=cJE- LPcwtP8https://www.youtube.com/watch?v=cJE- LPcwtP8
17
Bivalves (things with 2 shells) Such as clams, mussels, oysters, and scallops. Bivalves are found in both freshwater and marine environments.
18
●Burrowing Clam: https://www.youtube.com/watch?v=6JyNp PUj1ys https://www.youtube.com/watch?v=6JyNp PUj1ys ●Ask an Expert: mussels https://www.youtube.com/watch?v=eq6XO h_ML4M https://www.youtube.com/watch?v=eq6XO h_ML4M ●Pearls: https://www.youtube.com/watch?v=tIOSW AbUf74 https://www.youtube.com/watch?v=tIOSW AbUf74
19
Cephalopods ● octopi, squids, cuttlefish, and nautilus ● soft-bodied, head is attached to foot ● foot is divided into tentacles with sucking disks ● small internal shells or no shell at all ● Many release ink ● Well developed eyes ● most complex of the mollusks
20
Octopus (creeps on tentacles)
21
Octopus ●Active Predators ●Learn easily, including learning by observation of another octopus ●Problem solvers
22
Octopus ●Fast swimmers, they can jet forward by expelling water through their mantles. And their soft bodies, with no internal or external skeleton, can squeeze into impossibly small cracks and crevices where predators can't follow. ●The amazing mimic octopuses are capable of changing their color body shape to mimic other animals
23
Octopus ●Have beaklike jaws that can deliver a nasty bite, and venomous saliva, used mainly for subduing prey. ●They have been found to play with “toys” and have personalities ●They have blue blood!!
24
Intro: https://www.youtube.com/watch?v=epbJi35lzEs Octopus versus Shark: https://www.youtube.com/v/p9A-oxUMAy8https://www.youtube.com/watch?v=epbJi35lzEshttps://www.youtube.com/v/p9A-oxUMAy8 Octopus escapes jar: https://www.youtube.com/v/PmDTtkZlMwM https://www.youtube.com/v/PmDTtkZlMwM Octopus camouflage: https://www.youtube.com/v/PmDTtkZlMwM Octopus Houdini: https://www.youtube.com/watch?v=9yHIsQhVxGM https://www.youtube.com/watch?v=9yHIsQhVxGM
25
Cuttlefish (the chameleon of the sea)
26
●https://www.youtube.com/v/2x-8v1mxpR0https://www.youtube.com/v/2x-8v1mxpR0
27
● Nautilus is only cephalopod with shell ● Squid have a modified shell called a pen ● Like the octopus, squids also have parrot- like beaks
28
●https://www.youtube.com/watch?v=PIheR Ycm6sIhttps://www.youtube.com/watch?v=PIheR Ycm6sI
29
Squid
30
●Giant Squid Documentary: https://www.youtube.com/watch?v=Cs6Kq pZ1PIE https://www.youtube.com/watch?v=Cs6Kq pZ1PIE
31
●Biology Corner ●HumanKind. AnimalKind. OneKind.
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.