Cnideria

Question 1

what are some characteristics of phylum cnideria

Answer 1

mostly marine, few freshwater species
cell walls differentiated to form tissues
two layer body wall with mesoglea
gastroderm and epiderm
single body cavity, coelenteron
mouth surrounded by tentacles
body types polyp and medusea
possesses nematocysts
larval form is planula
non central nervous system

Question 2

what are some cell types in cniderian body structure

Answer 2

nutritive muscle cells
enzymatic gland cell
nerve cell
sensory cell
epitheliomuscle cell

Question 3

what are some components of cnidoblasts

Answer 3

cnidocil
nematocyst

Question 4

what are the classes of cnideria

Answer 4

hydrozoa
scyphozoa
anthozoa

Question 5

what are the orders of class hydrozoa

Answer 5

trachylina
hydroida
actinulida
siphonophora
hydrocorallina

Question 6

what are some features and an example of the order trachylina

Answer 6

no polypoid stage
aglaura
planula
actinula

Question 7

what are some features and an example of the order hydroida

Answer 7

well developed polypoid stage
vast majority colonial with external skeleton
obelia
tubularia
polymorphic polyps

Question 8

what is the life cycle of obelia

Answer 8

sperm + ovum
zygote
blastula
planula
polyp
medusae

Question 9

what is a thecate and athecate hydroid and what are some examples

Answer 9

athecate - skeletal covering does not surround hydranth clava
thecate - covering surrounds hydroid
obelia

Question 10

what are some types of zooids

Answer 10

gonozooid
dactylozooid
gastrozooid

Question 11

what is velella

Answer 11

by the wind sailor, polymorphic polyps attached to float and sail

Question 12

what are some features and an example of the order actinulida

Answer 12

tiny solitary polyps
can live on sand grains
otohydra
halammohydra
psammohydra

Question 13

what are some features and an example of the order Siphonophora

Answer 13

colonial, pelagic, includes polypoid and medusoid
physalia physalis (man of war)

Question 14

what are some features and an example of the order hydrocorallina

Answer 14

polypoid and colonial with CaCO3 skeleton
milleporina

Question 15

what are the orders of class scyphozoa

Answer 15

stauromedusae
cubomedusae
coronatae
semaeostomae
rhizostomae

Question 16

what are some features and an example of the order stauromedusae

Answer 16

sessile, medusae attached by stalk
haliclystus

Question 17

what is an example of the order cubomedusae

Answer 17

box jellyfish
carybdea

Question 18

what are some features and an example of the order coronatae

Answer 18

bell of medusa constricted by groove
many deep sea jellyfish
periphylla

Question 19

what are some features and an example of the order semaeostomae

Answer 19

bowl or saucer shaped medusa with scalloped margins
chrysaora
aurelia(moon jellyfish)

Question 20

what are the stages of the reproductive cycle of aurelia

Answer 20

planula larva
scyphistoma
strobilia
ephyra

Question 21

what are some features of the rhopalium of auralia

Answer 21

pigment photoreceptors
statocysts

Question 22

what are some features and an example of the order rhizostomae

Answer 22

bell of medusa lacks tentacles
oral arms folded and branched
rhizostoma
casseopeia - photosynthetic algae

Question 23

what are the two subclasses of octocorallia

Answer 23

octocorallia - polyps with 8 tentacles
zoantharia - polyps with more than 8 tentacles

Question 24

what are the orders of subclass octocorallia

Answer 24

stolonifera
telestacae
alcyonacae
coenothecilia
gorgonacae
pennatulacea

Question 25

what are some features and an example of the order alcyonacea

Answer 25

soft corals rubbery coenenchymal mass skeleton of calcerous spicules alcyonium

Question 26

what are some features and an example of the order gorgonacea

Answer 26

upright plantlike growth skeleton of horny organic material swiftia

Question 27

what are some features and an example of the order pennatulacea

Answer 27

sea pens fleshy flattened or elongated body skeleton of calcerous spicules pennatula

Question 28

what are the orders of subclass zoantharia

Answer 28

zoanthodea actinaria scleractinia corallimorpharia ceriantharia antipatharia

Question 29

what are some features and an example of the order zoanthidea

Answer 29

small anemones single siphonogylph no skeleton

Question 30

what are some features and an example of the order actinaria

Answer 30

sea anenomes no skeleton actinia

Question 31

what are some features and an example of the order scleractinia

Answer 31

stony corals external calcareous skeleton caryophylia - one of few uk corals

Question 32

what are some features and an example of the order corallimorpharia

Answer 32

radially arranged tentacles similar to true corals lacks skeleton corynactis

Question 33

what are some features and an example of the order ceriantharia

Answer 33

burrowing anenome lives in sediment pachycerianthus