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Ch 7 Cnidaria Ctenophore anatomy ecology

Zoology 212 Lecture notes on Cnidaria, Ctenophore anatomy and ecology CH 7
Course

Zoology (BIOL 212)

28 Documents
Students shared 28 documents in this course
Academic year: 2022/2023
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Saginaw Valley State University

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Cnidaria

life-sea.blogspot Recall some of our learning objectives:

  1. how do they locomote
  2. how do they reproduce
  3. how do they feed
  4. where they live
  5. how do they interact with others Petoskey Stone: fossilized rugous coral from a Devonian [415 - 360 mya] coral reef Geologyin 1 In animals other than sponges, gastrulation [pp. 73-74] forms two germ layers: ectoderm and endoderm. Archenteron = tube 2 Blastopore = opening A blastula occurs in all metazoans. Ectoderm – 1. epidermis
  6. Mesoglea : non-cellular layer
  7. gut : gastrovascular cavity Endoderm – 2. gastrodermis Germ layer Tissue The blastocoel is a fluid-filled cavity. blastula gastrulation The result in cnidarians: diploblasts and tissue-organized. 2

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5 Cnidocytes are present in tentacles and the GVC to capture and subdue prey. Cnidarians are carnivores. Science Photo Library Northern Red Anemone eating crab, Gulf of Maine Many animals can eat cnidarians [fish, ctenophores, sea turtles, flatworms, molluscs]. Ctenophores can incorporate unfired cnidocytes into their defenses. Undigested bits exit through the mouth. There is no excretory system. Dusky driftfish, Psenes arafurensis australianmuseum.net 5 6 Cnidarians possess a nerve net: uniform distribution of sensory cells and motor neurons. Even without a ‘brain’, they exhibit complex behaviours and respond to stimuli. Nerves connect sensory & effector cells: neuromuscular system We kept the remnants of this nerve net. Movement in this jelly is by contraction of ring muscles. Fluid in the GVC serves as a hydrostatic skeleton. 6

Carnivores
  • In gastrovascular cavity

####### endoskeleton

  1. hydrostatic because liquid is not compress able merest muscle systems connected
  • Clusters of nerves spread equal

7 The lifecycle of a typical jellyfish exhibits both medusae [sexual reproduction, mobile] and polyps [asexual reproduction, sedentary]. 4. Polyp [scyphistoma] Asexual phase: colony of polyps Sexual phase:

  1. medusae produce gametes Produces juvenile medusae by budding
  2. Planula larva
  3. Eggs in female M. Strike & K. Jones salinella.bio.uottawa Colonial polyp: 5. strobila J. Craggs & J. Robson Juvenile medusa: 6. ephyra 7 8 Cnidarians have a marine origin and were once the top predators. Are we moving back to that condition? Richardson et al. 2009 8 fixed condition dioecious Vg ( 2 Individuals)

μ☒sAeM☒ monoecious

-_ hermaphrodite t Simultaneous sequential noble cilia → able move

  • able to find new environment
  • reduces Intraspecific Competition Many polyps migration vs dispersal
  • Gene -510W og
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Ch 7 Cnidaria Ctenophore anatomy ecology

Course: Zoology (BIOL 212)

28 Documents
Students shared 28 documents in this course

University: Saginaw Valley State University

Was this document helpful?
1
1
Cnidaria
life-sea.blogspot.com
Recall some of our learning objectives:
1. how do they locomote
2. how do they reproduce
3. how do they feed
4. where they live
5. how do they interact with others
Petoskey Stone:
fossilized rugous coral from a
Devonian [415 - 360 mya] coral reef
Geologyin.com
1
In animals other than sponges, gastrulation [pp. 73-74] forms
two germ layers: ectoderm and endoderm.
Archenteron = tube
2
Blastopore = opening
A blastula occurs
in all metazoans.
Ectoderm –1. epidermis
3. Mesoglea : non-cellular layer
4. gut :gastrovascular cavity
Endoderm –2. gastrodermis
Germ layer Tissue
The blastocoel is a
fluid-filled cavity.
blastula
gastrulation
The result in cnidarians:
diploblasts and tissue-organized.
2
!
gastrula
as
-
exposed
to
environment

Students also viewed

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