15d – other invertebrates
DESCRIPTION
15D – Other Invertebrates. Page 468 – 473. Phylum Mollusca. 2 nd largest animal phylum 3 Classes Class Bivalvia Class Gastropoda Class Cephalopoda. Phylum Mollusca. Octopus, oysters, snails, slugs, squid, clams All Mollusca have the following: - PowerPoint PPT PresentationTRANSCRIPT
15D – Other Invertebrates
Page 468 – 473
Phylum Mollusca2nd largest animal phylum3 Classes
Class BivalviaClass GastropodaClass Cephalopoda
Phylum MolluscaOctopus, oysters, snails, slugs, squid, clamsAll Mollusca have the following:
Mantle: protects the organs (insides); helps it breathe
Shell: hard outer covering; protects the bodyVisceral Hump: holds the heart, stomach, and
excretory organs (where it pees and poops)Foot: allows it to moveRadula: organ with small teeth that grabs food
and pulls the food into the mouthBabies are called trochophore
Phylum Mollusca
Class BivalviaOysters, clams, mussels, and scallopsThis class has a shell with two halvesCalled “filter feeders” because they pull in
water and eat the smaller animals out of the water
Water is pulled in and pushed back out by siphons – these work like straws
Gills allow Class Bivalvia to breathe These are usually sessile (don’t move) with 2
external (outside the animal) shells
Class Bivalvia
Class GastropodaCalled Stomach-footed mollusks because they
have their foot under their visceral humpSnails, slugs, nudibranchesUsually move by crawlingUsually have one external shell (not slugs)Usually have a mantle cavity: a space
between the shell and the body that acts as a lung
Class Gastropoda
Class CephalopodaOctopus and squid – the foot is divided into
arms with suckers that are used to catch foodCalled head-footed mollusks because their
foot is under their headThey live in the ocean and swim
Class Cephalopoda
Phylum EchinodermataSea urchins, starfish, sand dollars, sea
cucumbers, brittle stars, basket stars, sea lilies, and feather stars
Live in the oceanThey have an endoskeleton called ossiclesThey have radial symmetryThey have a water-vascular system: they pull
water into themselves in order to change water pressure around them and work the suction cups on their arms
Phylum Echinodermata
Class AsteroidaStarfishTube feet are the suction cups inside of the
rays (arms) that help the starfish grab food and move
They regenerate (if you cut a part off, it will grow back)
Class Asteroida
Class EnchinoideaSea Urchins and Sand DollarsThey have spines that protect themThey are scavengers: they will eat anything
Class Enchinoidea
Class HolothuroideaSea CucumbersThey are slow-moving and eat whatever they
can trapWhen they are attacked, they throw out their
internal organs and run away, then regenerate (make) new organs
Class Holothuroidea
Class OphiuroideaBrittle Stars and Basket StarsBrittle stars throw away their arms when
they are attacked, then regenerate their armsBasket Stars eat at night – they raise their
arms to make a basket shape to trap small animals and eat them
Class Ophiuroidea
Class CrinoideaSea Lilies and Feather StarsSea lilies are sessile (don’t move)Feather stars are able to crawl slowly
Class Crinoidea