Cnidarian Keywords

Question 1

Define class hydrozoans

Answer 1

Most developed, medusa with velum, and medusa from lateral buds

Question 2

Define class cubozoa

Answer 2

Second most developed, has unique eye and pedalia

Question 3

Define class scyphozoa

Answer 3

Second most derived, rhopalia on the medusa bell margin

Question 4

Define class anthozoa

Answer 4

The most primitive group, with muscular septa and gonads in the digestive tract

Question 5

Define blastula

Answer 5

hollow sphere of cells

Question 6

Define dimorphic life cycle

Answer 6

Half polyp, half medusa

Question 7

Define diploblastic

Answer 7

having a body derived from only two embryonic cell layers (ectoderm and endoderm, but no mesoderm)

Question 8

Define ephyra

Answer 8

A larval jellyfish upon separation from scyphostoma

Question 9

Define scphistoma

Answer 9

Early polyp that has just developed from the planula

Question 10

Define gastrulation

Answer 10

Early phase in development where the single layered blastula is reorganized into a trilaminar structure called the gastrula

Question 11

Define hydranth

Answer 11

Terminal part of the hydroid polyp that bears the mouth, tentacles, and stomach region

Question 12

Define Mesoglea

Answer 12

tissue between epidermis and gastrodermis that cements them together, also acts as hydrostatic skeleton

Question 13

Define myoneme

Answer 13

Contractile filaments used for defending itself from harm

Question 14

Define nematocyst

Answer 14

the specialized dart that springs out of cnidocyte cell

Question 15

Pedalia definiton

Answer 15

structure unique to cubozoans, holds tentacle

Question 16

define rhopalia

Answer 16

evenly spaced sensory structures in scyphozoans and cubozoans

Question 17

define septa

Answer 17

muscular wall

Question 18

define statocyst

Answer 18

organ for balance and orientation

Question 19

Define strobila

Answer 19

stack of immature jellyfish that is glued to substrate

Question 20

Define tissue grade

Answer 20

To finally have body organization that is organized as tissues

Question 21

Define velum

Answer 21

flap that allows the jellyfish to push water out with more force than when taking in