Inverterbrates 15

Question 1

What is an invertebrate?

Answer 1

Animals that lack a backbone , Example: fish

Question 2

Classifying invertebrates based on evolutionary relationships.

Answer 2

Porifera, Cnidaria, lophotrochozoa, enysozoa

Question 3

Sponges

Answer 3

Basal, lack tissues

Question 4

Cnidarians

Answer 4

ancient, with tissues

Question 5

Lophotrochozoans

Answer 5

Wide range of bodily forms

Question 6

Endysozoans

Answer 6

most species-rich

Question 7

Deuterostome

Answer 7

Chordates echinoderms

Question 8

Phylum Porfiera: Sponges

Answer 8

most basic animals , lack tissues , sedentary (sessile) , mostly marine.
filter feeders flagella move water through body

Question 9

Phylum Cnidaria: animals with stinging cells

Answer 9

defense or predation.
may release venom , some sessile others motile
Body plan: central cavity, one opening

Question 10

Cnidocytes

Answer 10

stinging cells
specialized calls for capturing prey
goal: sting/capture prey
when triggered shoot out harpoon

Question 11

Cnidarian are predators

Answer 11

Tentacles used to capture prey and bring to the mouth
cnidarians have tissue = contractile (movement ) and nervous tissue (to detect / respond)

Question 12

Invertebrates evolutionary relationships

Answer 12

common ancestor of all invertebrates : sponges animals with tissues
bilateria

Question 13

Animal group

Answer 13

Eumatozoa: all animals - except sponges
Bilateria: majority of animals

Question 14

Bilateria

Answer 14

L/R side bilateral symmetry
3 tissue layers: endo, ecto, mesoderm
digestive tract: 2 openings
body cavity: coelom

Question 15

Lophotrochozoa

Answer 15

Have a lophore
Crown of tentacles for feeding
surrounds mouth
ciliated
also functions in gas exchange (o2 in Co2 out)

Question 16

Trochophore larvae

Answer 16

have cilia that function in movement and capture prey
most diverse group in bilaterians

Question 17

Lophotrochoza: Phylum Platyhelminthes

Answer 17

Free-living or often parasitic –> tapeworms
thin/fat bodies allow for gas exchange
differ from other bilaterians
1) One opening
2) no cavity

Question 18

Lophotrochozoa: Phylum Molluscs

Answer 18

Include: small slugs
-bivlaves>two > hinges
octopus/ squid group
soft body, usually have shell ( may be reduced)

Question 19

3 Parts of Mollusc body plan

Answer 19

1) foot: movement or a suction cup
2) Visceral mass: contains organs
3) Mantle: fold tissues, secretes shell

Question 20

Endyozoans

Answer 20

The most species-rich animal group
Enydsis= molting, shedding exoskeleton

Question 21

Endysozoa: Phylum Arthopods

Answer 21

segmented body
hard outer skeleton, made of chitin
jointed appendages
sensory organs
includes insects, arachnids, crustaceans

Question 22

Deuterostomes

Answer 22

includes some invertebrates and all vertebrates

Question 23

Phylum echnoderms

Answer 23

-often slow-moving
- in bilateria, but have radial symmetry