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Cnidaria

BIOL2204 Cnidaria

QuestionAnswer
Sub-phyla/Class details Subphylum Medusozoa (C. Hydrozoa, Scyophozoa, Cubozoa) Subphylum Anthozoa (C. Hexacorallia, Octocorallia
Hydra CS epidermis, mesoglea, gastrodermis, gastrovascular cavity (diploblastic)
Cnidocytes cnidocyte is the cell, cnida is the capsule in the cell, nematocyst is a common type of cnida)
3 Types of Zooids gastrozooids/hydranths = feeding gonozooids/blastistyles = reproductive dactylozooids = defense
Draw Life Cycle Diagram 1. egg + sperm (fertilisation) (n) 2. Zygote (2n) 3. Planula larvae 4. Developing polyp (settlement) 5. Polyp 6. Polyp colony with gonozooids 7. Medusa
Purpose of medusa and planula larva stages Medusa: aids dispersal by increasing the chance of reproduction BETWEEN colonies Planula: carried by currents, allowing the species to colonise NEW areas
Scyphozoa and Cubozoa Medusozoa classes in which the medusa is the most dominant stage
C. Scyphozoa Characteristics bell, saucer or umbrella shaped, no complex eyes
C. Cubozoa Characteristics box-shaped, image-forming eyes
Scyphozoan Life History biphasic, adult medusae produce eggs + sperm, planula larvae develop, settle and become a small polyp (Scyphistoma)
How do Scyphistoma reproduce? reproduce asexually by strobulation (transverse constrictions = stack of coins), releasing juvenile medusa one at a time
Life History Order adult medusa -> gametes -> zygote -> planula larva -> scyphistoma -> strobila -> ephyra -> adult medusa
What does sub-phylum Anthozoa consist of? solitary polyps (anemones) or colonial polyps (corals + sea fans)
Hydra Structure mouth is surrounded by hollow tentacles, opens into the actinopharynx and leads to the gastrovascular cavity
Gastrovascular cavity structure divided by internal sheets of tissue called mesenteries which extend forward from the body wall
Complete vs incomplete mesentary complete reaches the actinopharynx, incomplete extends only part of the way into the gastrovascular cavity
C. Octocorallia e.g. soft corals, sea fans, sea whips and sea pens each polyp has 8 pinnate tentacles, 8 mesenteries
C. Hexacorallia e.g. anemones, stony corals, zoanthids smooth, multiples of 6
Created by: mishm
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