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Radiate Phyla II. Chapter 7. Class Cubozoa: Sea wasps and box jellyfish About 3 dozen species almost all are tropical. medusa & polyp body forms thick mesoglea. Unfrilled bell margin drawn inward to form a velum-like structure. Cubozoan Sensory Structures.

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class cubozoa sea wasps and box jellyfish about 3 dozen species almost all are tropical
Class Cubozoa: Sea wasps and box jellyfishAbout 3 dozen species almost all are tropical.

medusa & polyp body forms

thick mesoglea

slide5

Cubozoan Sensory Structures

Sensory structures called rhopalia.

slide6

Cubozoan Sensory Structures

cubozoans have eyes.

The larger regions actually contain lenses, corneas, and retinas.

predominantly two species responsible
Predominantly two species responsible
  • The Box Jelly Chironex fleckeri
  • Irukandji Carukia barnesi
box jelly chironex fleckeri
Box Jelly Chironex fleckeri
  • Box jellies or sea wasps are thought to be responsible for about 65-100 deaths over the past 50 years in Australia.
  • The tentacles can be up to 10 feet long.
  • In Australia twice as many people die annually from box jellies as from sharks.
  • The toxin of most cubomedusan jellies is more potent than cobra venom.
irukandji carukia barnesi
Irukandji Carukia barnesi

Stings have been recorded from Australia, and a similar syndrome has been described elsewhere in the Pacific.

Every summer, more than sixty people are hospitalized with this potentially fatal syndrome.

cubozoan life cycle
Cubozoan Life Cycle
  • Similar to jellyfish.
class anthozoa
Class Anthozoa
  • polyp body form ONLY
  • all marine
class anthozoa18
Class Anthozoa
  • some are colonial
  •  colonies are formed of individual zooids
  • some are solitary
class anthozoa life cycle
Class Anthozoa- life cycle

Sexual reproduction

sperm

egg

larva

class anthozoa life cycle20
Class Anthozoa- life cycle

asexual reproduction

fission

pedal laceration

fission

class anthozoa21
Class Anthozoa

Sea anemones

class anthozoa25

Sea pansy

Class Anthozoa

Soft Corals

Sea pen

class anthozoa27
Class Anthozoa

Stony Corals

the corals
The Corals
  • Make up the largest group of Anthozoa
  • Colonial
  • Secrete skeleton of calcium carbonate
    • Cup shaped
    • Polyp is fixed to this
slide29

Theca

Sclerosepta

ctenophores comb jellies
Ctenophorescomb jellies
  • Solitary
  • All marine
  • Sexual reproduction
feeding
Feeding
  • Feed with specialized cells called colloblasts or lasso cells.
  • A few species have cnidocytes.
slide38

Ph. Ctenophora

Cl. Nuda

ctene row

Deiopea kaloktenota

Cl. Tentaculata

Pleurobrachia sp.

Coeloplana sp.

Cestus sp.

bioluminescence
Bioluminescence
  • Produce light using photocytes
  • Located in the walls of the digestive system
  • Appears that light is coming from comb rows
  • NOT all produce luminescence
big picture
Big Picture
  • The radiate phyla are the first (i.e. basal) Metazoans
  • Most have a dimorphic life cycle
  • Specialized structures the Cnidocytes
  • Some such as corals secrete a calcium carbonate base
  • Ctenophores produce bioluminescence