Presentation is loading. Please wait.

Presentation is loading. Please wait.

Kingdom Animalia, Phylum Mollusca (means “soft”)

Similar presentations

Presentation on theme: "Kingdom Animalia, Phylum Mollusca (means “soft”)"— Presentation transcript:

1 Kingdom Animalia, Phylum Mollusca (means “soft”)
Mollusks Kingdom Animalia, Phylum Mollusca (means “soft”)

2 What is a Mollusk? Soft body with internal or external shell
Ex: snails, slugs, clams, squids, and octopi Trochophore larva

3 Body plan: Foot – takes on many forms Mantle – covers the body
Shell – (present in most), made by glands in the mantle Visceral mass – internal organs

4 Feeding: Herbivores, Carnivores Filter feeders (clams,
Oysters, scallops) Parasites Many feed using a flexible tongue shaped structure called a radula. (snails, slugs)

5 Respiration: Aquatic mollusks – snails, clams – breathe using gills in the mantel cavity Land snails breathe with a “lung” – a mantle cavity with a large surface area and many blood vessels.

6 Circulation – can be open or closed
Open works better for slow moving mollusks (less efficient) Closed works better for fast moving mollusks (more efficient) Excretion – tube shaped nephridia Response – nervous systems vary from simple to complex Reproduction – many reproduce sexually with external fertilization, Tentacled mollusks this is usually internal A few are hermaphrodites All have a free swimming trochophore larva !

7 Groups of Mollusks 1. Gastropods 2. Bivalves 3. Cephalopods
Three major classes of mollusks 1. Gastropods 2. Bivalves 3. Cephalopods

8 Gastropod snails, slugs, and nudibranchs Shell-less or single shelled
Move by a muscular foot Some are poisonous, bright colors

9 Snail

10 Slug

11 Nudibranchs (sea slugs)
Check out the nudibranch gallery at nationalgeographic

12 Bivalves (things with 2 shells)
Such as clams, scallops

13 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

14 Cuttlefish (the chameleon of the sea)

15 Nautilus is only cephalopod with shell
Squid have a modified shell called a pen Well developed eyes most complex of the mollusks

16 Octopus (creeps on tentacles)


18 Squid

19 Octopus versus Shark

Download ppt "Kingdom Animalia, Phylum Mollusca (means “soft”)"

Similar presentations

Ads by Google