Phylum Cnidaria

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Phylum Cnidaria
?.????
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Phylum Cnidaria

• ????????????????????????????????????????????
• ???????????? 2 ??????? epidermis ??? gastrodermis
  ???????????????????? (mesoglea)
• ???????????????????????????? (nerve net)
• ???????????????? cnidocyte
• Gastrovascular cavity ?????????
• ??????? 97 ??????????

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Radial symmetry
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Cnidarian Life Cycle
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Cnidarian form

• Polyp form
• ????????? ???????????
• Basal disc ??????????????
• Oral disc ????????????????????? tentacle
  ???????????????

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• 2. Medusa form
• ?????????????????????
• ???????????????? exumbrella
• ??????????????????? subumbrella
• ?????????????????????? manubrium
  ??????????????????? (oral)
• ????????? tentacle ?????????

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Cnidocyte

• ????????????????????????????????????????
• Cnidocil ?????????
• Nematocyst ???? organelle ?????????????????
  ?????????? capsule ?????????? (operculum)
  ????????????????????????

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Cnidocyte Structure and Nematocyst Discharge
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Nematocyst ?? Hydra

• Penetrant
• - ???????? capsule ??????
• - ?????????? nematocyst ??????
  ?????????????????? 3 ???
• - ??? nematocyst ?????????????????????
  ????????????
• - ??????????????????????? ???????????????????????
  ???????

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Penetrant
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2. Volvent - ???????? capsule ?????? -
??????????????????????????? ???????????
??????????????? 3. Streptoline glutinant -
capsule ??? ???????????? ??????????????? ??????
tentacle ?????????????????????? 4. Stereoline
glutinant - capsule ?????? ??????????????????????
???? ????????????
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Volvent Glutinant
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Glutinant Penetrant Volvent
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???????????????????
?????????????? 8 ??.
?????????????? 1 ???
?????????????? 2 ???
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?????????????? 4 ???
?????????????? 5 ???
?????????????? 9 ???
?????????????? 6 ???
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??????????????????

• Tentacle ???????????????
• ???????????? gastrovascular cavity
  ????????????????
• ?????????????????? ?? enzymatic gland cell
  ???????????????????????????
• ????????????????? ?? nutritive cell
  ???????????????????????????????????? engulfment

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Nervous System

• Nerve cells ????????????????????? nerve net

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Class Hydrozoa

• ??????????????????? ?????????????? 20 ????
• Cnidocyte ???? epidermis ????????
• ???????????????? 2 ???
• Hydromedusa ??????????????????????????????????
  velum
• Mesoglea ????????????
• Asexual reproduction ??? budding
• Sexual reproduction ????? gamete
  ????????????????????

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Hydra Body Wall
Gastrovascular cavity
Gastrodermis
Mesoglea
Epidermis
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Epidermis Mesoglea Endodermis (gastrodermis)
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(hypostome)
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Chlorohydra viridissima

• endosymbiont ??? zoochlorellae ?????? gastrodermis

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Class HydrozoaHydra
Encapsulated embryo
Ovaries
Budding
Spermaries
Asexual cycle
Sexual cycle
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Bud
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Male gonad
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Female gonad
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Hydra x.s.
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• Obelia ??????????????? ???? colonial hydroid
• - hydrorhiza ?????????????? ???????????????
• ?????????
• - hydrocaulus ???????????? hydrorhiza
• - coenosarc ??????? ??????? epidermis
• ??? gastrodermis
• - perisarc ?????????? ??????? chitin ???
• epidemis ?????????

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• Polyp ?? 2 ???????
• 1. Hydranth ???? feeding polyp
  ?????????????????? ?? tentacle ????????
• 2. Gonangium ????????????? hydranth ???
  hydrocaulus ???? reproductive polyp
• - blastostyle
• - medusa bud
• - gonotheca ??? gonopore

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?????
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Hydromedusa

• ?????????????????? velum
• Gastrovascular cavity ??????? 4 ?????????
  manubrium ?????? radial canal
• ???? radial canal ????????????????????????? (ring
  canal)
• Gonad 4 ??????? epidermis ???????????????? radial
  canal (Obelia ????? velum)

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Obelia (????? velum)
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Obelia medusa
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Class HydrozoaGonionemus
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Class HydrozoaPhysalia spp.

• Hydroid ???? polymorphic colony
• Pneumatophore ?????????????? ectoderm
• ????????????? ?? gas gland ?????????
• Coenosarc ??? polyp ????????? (cormidia)
• Cormidia ?????????? polyp ??????? 2 ????
• ??????????????????????

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• Cormidia ??????????????????? polyp ??????
• 1. Dactylozooid ??????????? cormidia
  ???????????? ???????? ???? 1 ?????????????????????
  ??? cnidocyte ?????????????? ?????????????????????
  ????
• 2. Gastrozooid ???????????? ????????????????
  ????????? ????????????????????????
• 3. Gonozooid ??????????????? ???????? medusa
  ???? 2 ??? ?????????????????????????

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Polyp
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Class HydrozoaPorpita spp.

• colony ?????????????????
• ????????? polyp 3 ??????
• - gastrozooid ???????
• - gonozooid ??? gastrozooid
• - dactylozooid ??????????

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Class HydrozoaCraspedacusta sowerbyi

• ???????????????
• ???????? 5 ??????? ?????? ????????? ???????? ???
  ??????????? ?????????? ?????????????????
  ??????????????????? ?????????????????????
• ??????????????????????? 6 ??????

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Class Scyphozoa

• ?????????????????
• ?????????????????? medusa
• Gamete ???????????? gastrodermis
• Scyphomedusa ????? velum
• Cnidocyte ?????? epidermis ??? gastrodermis
• Mesoglea ???????????
• Statocyst ??????????

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Statocyst
Ephyra stage
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Aurelia sp.

• Manubrium ?????? 4 ???????? oral arm
• ????????????? gastric pouch 4 ??? ?? gonad
  ?????????????????????
• Gastric pouch ?????????? radial canal
  ??????????????????
• Radial canal ????????????????????????????
• (Ring canal ??????? Aurelia)
• Dioecious ??????????????????

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Aurelia Life Cycle
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Aurelia
Mesoglea
Eggs
Gastrovascular cavity
Mouth
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Aurelia
Oral arm
Mouth
Gastric pouch
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Class CubozoaBox jellyfish

• ?????????????????? medusa ????????????????????????
  ???????? ???????? velum
• ???????????????????????????????????????????????(pe
  dalium)
• ?????????????????????? ?????????????????????
• Cnidocyte ????????????????????

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Class Cubozoa
Gonad
Pedalium
Tentacle
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Class Anthozoa

• ???????????? polyp ???????
• ???????????? solitary ???? colony
• ????????????????????????
• Gastrovascular cavity ?????????????
• ?????????????????

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Class Anthozoa
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Class AnthozoaMetridium
Tentacle
Mouth
Pharynx
Septum
Gastrovascular cavity
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Symbiosis
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Class AnthozoaStony coral

• ???????????????????? CaCO3
• ???????????? colony ?????? Fungia
• ??????????????????? zooxanthellae
• ???????????????

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Class AnothozoaCorals
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Class AnothozoaSea Fan

• Endoskeleton ???????????
• ??? gorgonin
• ???????? CaCO3 spicule
• ???????????? spicule

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Class AnthozoaSea Whip
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Soft coral

• Endoskeleton ?? spicule ??????????????????

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Class AnthozoaSea Pen

• Axial polyp ??? ?????????????????? polyp ????
  ??????????????????????? polyp ????????????????????
  ???

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