Zoology Lab Practical #1

Question 1

Phylum Porifera

Answer 1

Class Calcarea, Class Demospongiae, Class Hexactinellida

Question 2

Class Calcarea

Answer 2

• Phylum Porifera
• spicule composition is Ca
• asconoid, syconoid, and leuconoid body plans
• lives in marine, shallow waters
• 2nd most diverse group of sponges
• worm-like

Question 3

Class Demospongiae

Answer 3

• Phylum Porifera
• spicule composition is Si
• leuconoid body plan
• lives in freshwater and marine, streams, ponds, lakes
• most diverse group of sponges
• big, bath sponges

Question 4

Class Hexactinellida

Answer 4

• Phylum Porifera
• spicule composition is Si, 6 points
• syconoid, leuconoid body plans
• lives in marine, deep ocean
• least most diverse group of sponges
• glass sponges

Question 5

Phylum Cnidaria

Answer 5

Class Anthozoa, Class Hydrozoa, Class Scyphozoa, Class Cubozoa, Myxozoans

Question 6

Cnidaria general characteristics

Answer 6

• pedal disc/contracting bell is for locomotion
• 2 germ layers
• middle layer is mesoglea
• cnidocytes collect food
• larvae are Planula larva
• 1 hole, two-way

Question 7

Class Anthozoa

Answer 7

• Phylum Cnidaria
• no known medusa body plan
• live in marine, shallow warm waters
• mutualistic relationship with zooxanthellae
• coral and sea anemone

Question 8

Class Hydrozoa

Answer 8

• Phylum Cnidaria
• medusa and polyp body plans
• live in marine and freshwater, deep ocean
• Obelia and Portuguese-Man-of-War
• hydra

Question 9

Class Scyphozoa

Answer 9

• Phylum Cnidaria
• medusa and polyp body plans
• marine, polar/tropical and deep/shallow waters
• rhopalium (statocyst and ocelli)
• jellyfish

Question 10

Class Cubozoa

Answer 10

• Phylum Cnidaria
• cube shaped bell
• marine, tropical shallow waters
• active hunters and swimmers
• velarium
• dermonecrotic toxin
• jellyfish

Question 11

Myxozoans

Answer 11

• Phylum Cnidaria
• obligate endoparasites
• marine and freshwater, need host
• polar capsule

Question 12

Phylum Ctenophora

Answer 12

• ctenophores
• 8 ctenes for locomotion
• 3 germ layers
• middle layer is collenchyme
• use colloblasts to collect food
• marine, warm waters
• larvae are Cydippid larva
• 2 holes, one-way

Question 13

Phylum Platyhelminthes

Answer 13

Class Turbellaria, Class Cestoda, Class Trematoda

Question 14

Phylum Platyhelminthes General Characteristics

Answer 14

• acoelomate
• organ level of organization
• free-living forms
• parasites (endo-)
• host needed
• moist habitats, terrestrial, aquatic

Question 15

Class Turbellaria

Answer 15

• Phylum Platyhelminthes
• planarians
• free-living
• regenerative abilities
• ocellus, auricle, pharynx
• terrestrial and aquatic

Question 16

Class Cestoda

Answer 16

• Phylum Platyhelminthes
• tape worms
• endoparasites
• suckers, hooks, scolex (‘head’ area), strobila (‘body’ area), proglottids (units of ‘body’), gravid eggs, uterus, testes

Question 17

Class Trematoda

Answer 17

• Phylum Platyhelminthes
• “flukes”
• endoparasites
• mouth, 2 suckers, yolk glands (dots on sides), uterus, testes, intestine, excretory pore