Invertebrate/Fish

What is the difference between invertebrates and vertibreates

invertebrates - no backbone

Vertebrates - has backbone

Characteristics of an arthropod

largest group of vertebrates (3/4), segmented joints, external skeleton that supports the body and the internal tissue

How do lampreys feed

suctoning onto the food and using sharp teeth

Characteristics of fish

gills, lateral line, swim bladders, paired fins for movement

What is unique about class agantha

tounges are covered by teeth

3 classes of fish

agantha. Chondrichthyes, Osteichthyes

agantha (fish species)

jawless fish, snake-like bodies, live in cold marine waters

chondrichthyes (fish species)

skeletons made of cartilage; not bone, 400 species, can smell blood up to 2 miles away

osteichthyes (fish species)

bony fish, swim bladders, covered in scales. Ex: bass, perch

types of osteichtheyes

pike, bass, perch; bony fish

types of agantha

hagfihs, lampreys

types of chondrichthyes

sharks, stingrays

What is the olfactory bulb for

analyzing scent information

swim bladder

thin walled sac, filled with gasses, help fish move up and down

Lateral line

detects vibrations in the water

what do gills do

gives fish oxygen

sponges - porifera

simplest kind of animals, bodies consist of 2 layers w/o any tissues or organs

animals that are cnidarians

jellyfish, corals, hydras

radical symmetry

body parts are arranged in a circular fashion

bi-lateral symmetry

left and right side of the body are the same

nematodes

roundworms, bi-lateral symmetry

annalids

body divided into many sections, earthworms (segmented worms)

mollusks

soft, unsegmented body, snails and slugs make up the largest of this group

characteristics of echinoderms

radical symmetry, live in the ocean

crustaceans

5 pairs of legs, most live in water. Crabs, lobsters, crayfish

arachinds

are insects, most live on land. Ex: spiters, scorpions, mites and ticks

insects are the

only invertebrate that can fly

pupa stage

stage of development that leads to the adult stage

what types of animials/species are included in the echinoderm

starfish, urchins, sand dollars, sea cucumbers

what kind of species has no organs and is the simplest kind of animials

porferia

What type of species/animal has: 3 pairs of legs, pupa stage

insects

rounded bodies, bi-lateral symmetry, many parasitic

nematodes

what does the caudal fin do

propel the fish forwards, move side/side

what does the dorsal/anal fin do

keeps the fish upright

what does the pelvic fin do

helps with stability and steering

what does the pectoral fin do

navigates and steers the fish