Invertebrates

Invertebrates

no spinal column or backbone; 97% of all animals

what features define animals?

multicellular- specialized cells, tissues

most are motile

heterotrophic

no cell wall

no symmetry

sponge

radial symmetry

longitudinal orientation

sea anemone

bilateral symmetry

body can be divided into roughly mirror-image halves by a single plane

goat

coelom

body cavity filled with mesoderm; has a fluid area

phlya with true coelom

annelida

arthopods

mollusca

AAM

pseudocoelom

cavity partly lined with mesoderm

pseudocoelom phylum

nemotoda

no coelom

no fluid-filled body cavity; filled with tissue

no coelom phylum

Platyhelminthes

Cnidaria

hydrostatic skeleton

muscles push against a constrained fluid

true coelomates can be either

protosomes

deuterostomes

protosomes

first opening is in the mouth

annelids, arthropods, mollusks

deuterostomes

first opening is the anus

echinoderms

chordates

porifera symmetry

no symmetry

porifera motility

no motile but larva are swimming

do proifera have tissues

no

choanoctye

flagellated cells – move water in through pores; differentiate into sperm

amoebocytes

nutrient transfer, differentiate into eggs

porifera nutrient absorption and gas exchange

water in through pores and out through top or osculum

porifera reproduction

asexual budding or sexual (hermaphroditic) – sperm are released, internal fertilization

cnidaria symmetry

radial

how many germ layers does cnidaria have

2

medusa

jellyfish

polyp

sea anenome

cnidaria digestive tract

one opening

how does cnidaria do gas exchange?

diffusion

cnidaria asexual reproduction

budding or fragmentation

cnidaria sexual reproduction

external fertilization- swimming larva

cnidocytes

stinging cells

nematocysts

coiled threads

platyhelminthes

flatworms, tapeworms, planarians

platyhelminthes symmetry

bilateral

platyhelminthes germ layers

3- no coelom

platyhelminthes gas exchange

across body wall- diffusion

platyhelminthes fertilization

internal- many hermaphroditic

platyhelminthes nerve cord

photosensory spot

tapeworms

have scolex or sucker at the mouth to attach

proglottids

segments of tapeworms are passed in feces of infected animals

mollusca

true coelom

mollusca symmetry

bilateral

mollusca body

soft segmented body

mollusca mantle

secrets calcium carbonate

mollusca radial tongue

strap made of chitin

chitons

marine, 8 overlapping flat shells like shingles

bivalves

oysters and clams

gastropods

Snails, slugs (stomach foot)

cephalopods

Octopus and squid (head foot)

annelids

earthworms and leeches

annelida symmetry

bilateral

do annelida have coelem

yes

annelida gas exchange

diffusion

annelida brain

simple

annelida sex

hermaphroditic

citellum

protects and nourised developing eggs

Nemotoda

roundworms and hookworms

Nemotoda symmetry

bilateral symmetry

Nemotoda coelom

psedudocoelom

Are nemotoda parasitic?

Yes

Nemotoda digestive tract

complete

Nemotoda cont.

Free living and parasitic

Brain

Cuticle that requires molting

Arthropods

85% of animals

insects, arachnids

Arthropods symmetry

bilateral

Arthropods exoskeleton

chitin

Arthropods cont.

Jointed legs

Larva stage

Sexual Dimorphism

Which phylum contains organisms with a Clitellum, a structure important in reproduction?

Annelida

Arthropods have an exoskeleton made of _________________.

chitin

Which of the following animals has radial symmetry? (Select more than one)

Jellyfish

Sea Anemone

Most of our organs are contained in a cavity within our bodies.  This is not true of all animals, but it is true of us.  What is this big open space called?

coelom

An organism that is multicellular with specialized tissues, eukaryotic, and heterotrophic, whose cells have no cell wall belongs to which kingdom?

Animal

Which of the following is a gastropod?

snail

There is a group of animals that have radial symmetry, exist as polyps and medusas, and have stinging cells.  These animals are

cnidarians

Name the type of symmetry found in an earthworm.

bilateral symmetry

Which phylum contains organisms with a Clitellum, a structure important in reproduction?

Annelida

Which of these animals have extracellular digestion and an excretory system, and bilateral symmetry?

flatworms

Jellyfish are classified in the following Phylum.

cnidaria