Cnidarians And Ctenophores

Question 1

Collarblasts

Answer 1

Adhesive cells

Question 2

Haeckelia Rubra

Answer 2

Only ctenophore with cnidocytes acquired from feeding on cnidarian medusa

Question 3

Octocorallia

Answer 3

Anthozoa, subclass, soft coral, sea pen, sea fan, octomerous symmetry, 8 tentacles, 8 septa

Question 4

Solenia

Answer 4

Tubes running through mesoglea used for communication in octocorallia

Question 5

Gorgonin

Answer 5

Similar to keratin and collagen

Question 6

Zoantharia

Answer 6

Anthozoa, True, stony coral, mini anemones, calcareous cup, gastrovascular cavity hexamerous

Question 7

Actinaria

Answer 7

Anthozoa, subclass, solitary sea anemones, attached to submerged strata. Glide via pedal disc

Question 8

Strata

Answer 8

Shells, rocks, timber

Question 9

Siphonoglyphs

Answer 9

Ciliated groove on sea anemones, drives water

Question 10

Pedal disc

Answer 10

Used for attachment in actinaria

Question 11

Oral disc

Answer 11

Surrounded by 1 or more circles of tentacles

Question 12

Mesentries

Answer 12

Sheet like partitions

Question 13

Protandrous

Answer 13

Produce sperm first and egg later

Question 14

Mesentries function in anthozoa

Answer 14

Provide support for gastrovascular cavity when filled with water. Increase surface area for digestion and absorption

Question 15

Ephyrae

Answer 15

Young jellyfish

Question 16

Velarium

Answer 16

Structurally different from velum. Margin of bell, used for swimming

Question 17

Pedalium

Answer 17

Tough blades at base of cubozoa tentacles

Question 18

Rhopalia

Answer 18

Small sensory structures of scyphozoa and cubozoa. Houses between lappets

Question 19

Lappet

Answer 19

Indentation in scyphozoa and cubozoa umbrella

Question 20

Statocysts

Answer 20

Aid with orientation and gravity

Question 21

Ocelli

Answer 21

Light detectors, photoreceptors

Question 22

Strobilation

Answer 22

Transverse budding of scyphistoma

Question 23

Strobila

Answer 23

Juvenile (baby) jellyfish

Question 24

Scyphistoma

Answer 24

Poly stage of scyphozoa after planula settles

Question 25

Physalia

Answer 25

Hydrozoan, Portuguese man of war

Question 26

Siphonophores

Answer 26

Large pelagic colonies of individuals

Question 27

Pneumatophore

Answer 27

Gas filled float. Colony member 1

Question 28

Hydra

Answer 28

Hydrozoan, no Medusa phase, freshwater, dioecious. No planula larvae.

Question 29

Aglaura

Answer 29

Hydrozoan, no polyp stage. Medusa produces planula

Question 30

Actinula

Answer 30

Arises from planula larvae in hydrozoan aglaura. Develops into aglaura

Question 31

Gonangium

Answer 31

Reproductive polyp that forms Medusa in obelia

Question 32

Bell Margin

Answer 32

Carries tentacles and specialized sense organs

Question 33

Function of Radial Canals

Answer 33

Guide movement of water

Question 34

Cnidocytes

Answer 34

Specialized cells with nematocyst

Question 35

Nematocyst

Answer 35

Stinging organelles. Contain barbs or venomous coiled thread