Jellyfish and Sea Anemones

Incomplete gut, one opening for mouth and anus

1 opening for mouth and 1 for anus

Multiple cell types forming a coordinated function, ex: organ

2 cell layers: ectoderm and endoderm

Outermost layer of skin on organisms

Layer of cells that lines the gastrovascular cavity in cnidarians (jellyfish, etc)

3 layers of cells: ectoderm, mesoderm, and endoderm

Middle layer of cells, in between ectoderm and endoderm

Innermost layer of cells

whose bodies form part of the epithelium but whose bases extend to form muscle fibers in parallel rows

epithelium-the thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures

(in invertebrates such as coelenterates and flatworms) a diffuse network of neurons that conducts impulses in all directions from a point of stimulus

an explosive cell containing one giant secretory organelle or cnida (what makes them sting)

a specialized cell in the tentacles of a jellyfish or other coelenterate, containing a barbed or venomous coiled thread that can be projected in self-defense or to capture prey

a slender flexible limb or appendage in an animal, esp. around the mouth of an invertebrate, used for grasping, moving about, or bearing sense organs

columnar body with the mouth uppermost surrounded by a ring of tentacles ex: sea anemone

umbrella-shaped body with stinging tentacles around the edge

the skeletons of old coral and it just piles on top of each other to form a huge coral reef

planula is a free swimming larvae and then it settles and becomes a polyp and then possibly a medusa

a stack of immature larval jellyfish formed on a sessile polyplike form by sequential budding

adhesive cells made by ctenophores (comb jellies)

ciliated combs (little hairs on the tentacles)

• Cnidocytes- nematocysts (stinging structures)
• Gastrovascular cavity
• Mouth surrounded by tentacles
• Medusa body form
• Planula Larvae

• "Hydrozoa"- Hydroids, Portuguese Man of War
• Scyphozoa- Larger "true" jellyfishes
• Cubozoa- Cube jellyfishes
• Anthozoa- Anemones, Coral, Sea fans, etc

• Marine
• 8 plates of ciliated combs (ctenes)
• Feeding tentacles with colloblasts (instead of stinging cells, it releases a sticky substance)
• Luminescent, fragile