Cnidarian (Jellyfish, Anemones, ect.) Flashcards Preview

Invertebrate Zoology > Cnidarian (Jellyfish, Anemones, ect.) > Flashcards

Flashcards in Cnidarian (Jellyfish, Anemones, ect.) Deck (18)
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1
Q

anthozoa

A
sea anemones, corals sea pens
polyps only
has a pharynx (opens into the siphonoglyph)
3 cnidocytes
septa
2
Q

medusozoa

A

jellies
- medusa stage
- linear mitocondrial DNA
reproduction (medusa-planula-polyp)

3
Q

scyphozoa

A

w/in medusozoa

  • medusa with rhopalia
  • strobilation (transverse fission)
4
Q

cubozoa

A
w/in medusozoa
- medusa with box-like body
- small polyps lacking septa
tentacles on pedal at 4 corner of bell (BOX JELLY)
- highly venomous
- ocellli at rhopalia
- velarium
5
Q

hydrozoa

A

w/in medusozoa - greater representation of the polyp morph, medusa with velum, cnidocytes absent

6
Q

cnidaria apomorphies

A

10 000 SPECIES

  • cnidocytes (stinging cells)
  • polyp adult and planula larva
  • nerve nets
  • longitudinal and circular muscle
  • endodermal gonads
  • circular mitochondrial DNA
  • Diploblast (2 layers, endo & ectoderm)
7
Q

metagenesis

A

alternation between medusa and polyp

8
Q

morphology

A
  • alternating sessile and motile generations
  • radial symmetry or medusa stage
  • gastrovascular cavity (coelenteron)
9
Q

nematocysts

A

injection of toxins
similar to protozoan
for defence and prey capture

10
Q

colonial forms of cnidaria polyp

A

fruiticose - generated by two different kind of budding polyp from other polyps
coenosarcal - stolonate mat, continuous
stolonate - tink strawberry runner

11
Q

skeletong

A
chitin (hydroids)
calcium carbonate (coral)
spicule endoskeleton (sea plumes)
hydrostatic (fluid filled cavity)
foreign material (zooanthellae & zoochlorellae)
12
Q

musculature

A

polyps - antagonistic sheets of smooth muscle (epidermal-longitudinal/shortening of the body and gastrodermal-circular/elongation of the body)
medusae - ring of muscles called the coronal muscle

13
Q

nervous system

A

sensory, motor, interneurons
nerve nets in the manubrium (both polyp and medusa)
concentrated eurons in coronal muscle

14
Q

cnidocytes

A

explosive cell contains one secretory organelle
capture prey and defence from predator
releases a toxin

15
Q

rhopalia

A

sense organs in-between each lappet

16
Q

strobilation

A

form of asexual reproduction (spontaneous transverse segmentation of the body)

17
Q

velarium

A

ring of tissue that extends around the bottom inside of the bell, involved in jet propulsion

18
Q

ocelli

A

eye