Chapter 13: Class Anthozoa Flashcards
What are the three subclasses??
Zoantharia, Cerianthpatharia and Alcyonaria
Main Characteristics?
- habitat?
- organs?
- Gastrovascular cavity?? (2) Septa whats up with that? Pairs not? maybe?
- all marine, in deep and shallow…varying in size
- no special organs for respiration or excretion
- Gastrovascular cavity:
- large and partitioned by speta or mesenteries, inward extensions of the body wall…
- septa may be coupled or paired !
Sea Anemones?? Whats up with those?
- polyps size /weight
- attach to what? (3)
- burrow?
- crown of tentacles location?
- O2 , waste , pressure?
- Polyps larger and heavier than hydrozoan polyps
- attached to shells, rocks, timber etc by pedal disc
- burrow in mud or sand alt
- crown of tentacles surrounds the flat oral disc
- transports oxygen, removes wastes and maintains fluid pressure for hydrostatic skeleton
Gastrovascular cavity (sea anemones)
- its divided into six pairs of?
- surface area is increased via?
- free edge of each incomplete septum forms? (2)
- septa or mesenteries
- smaller or incomplete septa subdivide the large chambers increasing surface area
- forms a septal filament with nematocysts and gland cells for digestion..
Acontia Threads? (sea anemone)
- location?
- equipped with?
- may protrude? for?
-at lower ends of septal filaments, equipped with nematocysts and may protrude through mouth to help secure prey.
What do sea anemones do when in danger???
-water rushes out of pores and the sea anemone contracts to a small size
Feeding behaviour in sea anemones are under?
- Asparagine? function?
- Glutathione? function?
chemical control
- activates feeding causing tentacles to bend toward mouth
- when there are reduced levels of this it induces swallowing..
Longitudinal muscles of the epidermis only occur where? (sea anemone )
-tentacles and oral disc
Longitudinal muscles of the column occur only where? in?
sea anemones
-gastrodermal, in septa
Most sea anemones can glide slowly via?
pedal disc
Reproduction in Sea Anemones ?
-sexual reproduction classification?
-dioecious, monoecious
The monoecious species of sea anemones are protandrous which means what?
produce sperm first and eggs later
Gonads are located where in sea anemones ?
margins of septa
Fertilization in sea anemones is ? or?
zygote becomes?
external or in gastrovascular cavity
-ciliated larva
Other forms of reproduction in sea anemones? (4)
pedal laceration, longitudinal and transverse fission and budding.
Hexacorallian Corals?
- order?
- nicknamed?
- physical description/comparison
- the Gastrocavity is ,…what?
- Do they have a pedal disc?
- Secretion ? (support?) Sclerosepta?
- Living tissue?
-members of Scleractinia (order)
-true/stony coral
-miniature sea anemones that live in calcareous cups they secrete.
-Gastrocavity is Hexamerous
-no pedal disc
I> secretes limey skeletal cup with sclerosepta projecting up into the polyp
- living tissue?—– forms over the coral surface…connecting all gastrovascular cavities of the colony !
Tube Anemones and Thorny Corals?
- subclass?
- Septa arrangement?
- Habitat for each?
- live in what kind of temp?
- Ceriantipatharia
-coupled but unpaired septa
-Tube Anemones live in soft sediments…solitary
I> Thorny or Black Corals..are colonial and attach to firm substrata
-both live in warmmer seas…
Alcyonarian Corals ?
- symmetry ?
- tentacle arrangement /amount
- septa arrangement ?
- Colonial or solitary?
- octomerous symmetry
- 8 pinnate tentacles
- 8 unpaired complete septa
- all are colonial and communicate via gastrovascular cavities via tubes.
Coral Reefs
- placement of animals and plants are located where?
- diversity?
- above the calcium carbonate deposits…aka limited to the top layer
- great diversity of organisms rivalled by only the rainforest
What type of corals and algae for most of the coral reef?
-Hermatypic corals and coralline algae
Hermatypic corals and coralline algae characteristics ?
- habitat description? temp,water state, location boundaries
- what live in the corals tissue and their function?/ relationship
-require warmth, light and salinity of undiluted sea water
-limited to shallow waters….between 30 degrees north and 30 degrees south latitude
-photosynthetic zooxanthellae live in their tissues
I> providing food for corals and recycle phosphorus and nitrogenous wastes.
What are the four types of reefs?
- Fringing, Barrier Atolls andPatch /Bank reefs.
Fringing Reef?
-near the land with no lagoon or a very narrow lagoon
Barrier Reef?
parallel to shore with a wide and deep lagoon