Cnidaria Flashcards
What is the grade of Cnidaria?
Eumetazoa
What classes make up the phylum Cnidaria?
Hydrozoa, Scyphozoa and Anthozoa
Hydrozoa are made up of…
Hydra, Physalia and Obelia
Scyphozoa are made up of…
Aurelia
Anthozoa are made up of…
Metridium
Which two genuses of Hydrozoa are colonial?
Physalia and Obelia
What two germ layers do Cnidarians possess?
epidermis and gastrodermis
The name of the jelly-like substance between the two germ layers is called
mesoglea
The ability to have two body morphs is referred to as
bimorphic
The polyp body morph is
sessile (attached) and benthic (at the bottom)
The medusa body morph is
floating and planktonic (floats along the H2O column)
The kind of body symmetry that Cnidarians possess is
radial
The digestive systems of Cnidarians is
incomplete with no cephalization
Stinging cells found in Cnidarians are called
cnidocytes
Stinging organelles found in Cnidarians are called
nematocysts. They are found coiled within cnidocytes
What causes nematocysts to fire?
tactile and chemical stimulation
Why are nematocysts used?
for prey capture and self-defense
The colonial Portuguese Man of War is an example of which Cnidarian genus?
Physalia
Gastrozoids in Physalia are which kind of polyp? What are they called in Obelia?
feeding polyps hydranths
Ganozoids in Physalia are which kind of polyp? What are they called in Obelia?
reproductive polyps gogangium
Dactylozoids in Physalia are which kind of polyp?
prey capture polyps due to their tentacles
What is the purpose of the septa in sea anemone?
it is the internal partition in the organism and increases surface area for digestion
Metridium examples are
corals and sea anemones
Pictured is which stage of the Aurelia life cycle?
Planula Larva
Pictured is which stage of Aurelia?
Scyphistoma
Pictured is which stage of the Aurelia life cycle?
Strobila
Pictured is which stage of the Aurelia life cycle?
Ephyra
Pictured is which stage of the Aurelia life cycle?
Adult Medusa
Pictured is…
Physalia tentacles
Pictured is…
Hydra budding
Pictured is…
Hydra gonads
Which stages of the Aurelia life cycle are benthic?
scyphistoma and strobila
Which stages of the Aurelia life cycle are planktonic?
planula larva, ephyra and adult medusa
What are the different members of the Physalia colony?
the feeding polyps (Gastrozoids)
the reproductive polyps (Gonozoids)
the polyps with tentacles (Dactylozoids)
Name the numbered structures.
- Tentacle
- ectoderm (epidermis)
- endoderm (gastrodermis)
- gullet
- primary mesentery
- pores
- gastrovascular cavity
- mesenterie filament
- acontia
- secondary mesentery
- tertiary mesentery
- gonads
- body wall
- basal disks
Name the numbered structures
- Gastrodermis
- Epidermis
- Mesoglea
- Mouth
- Hypostome
- Basal disk
- Tentacles
- Ovary
- Testis
- Gastrovascular cavity
- Bud
Name the numbered structures
- Gastrodermis
- Epidermis
- Mesoglea
- Gastrovascular cavity
- Nutritive Muscular Cells
- Food particle being engulfed
- Gland cell
- Epitheliomuscular Cells
- Interstital Cells
- Cnidoblasts/Cnidocytes
- Circular Muscle fibril
- Longitudinal Muscle fibril
- Neurons
Name the numbered structures
- Epidermis (ectoderm)
- Coelenteron
- Mesoglea
- Gastrodermis (endoderm)
Name the numbered structures
- Coelenteron
- Testes
- Epidermis (ectoderm)
- Gastrodermis (endoderm)
Which gender of Hydra is pictured?
Name the numbered structures.
male
- Tentacles
- Testes
Which gender of Hydra is pictured?
Name the numbered structures.
female
- Tentacles
- Ovary
- Basal disk (foot)
Name the numbered structures.
- Tentacles
- Bud
- Hypostome
- Basal disc (foot)
