What is the most simple metazoan?
What type of body symmetry do Cnidarians have?
Radial (some biradial)
axis in which radiate body parts are arranged around
What level of organization do Cnidarias have?
What are the classes of Cnidarians?
How many species of Staurozoa are there?
How many species of Cubozoa are there?
How many species of Anthozoa are there?
How many species of Hydrozoa are there?
How many species of Scyphozoa are there?
Which classes have a medusoid body form?
Which classes exist only in a medusoid body form?
Which classes have an alternation of generations between medusoid and polyp forms?
Which class has hexaradial or octaradial symmetry?
Which class exhibits strobilation?
Are Cnidarians diploblastic or triploblastic?
What germ layers do Cnidarians have?
endoderm and ectoderm
Are germ layers adaptive or derived in Cnidarians?
Is the gastrovascular cavity of Cnidarians complete?
Are Cnidarians protostomes or dueterostomes?
What type of skeleton do Cnidarians tend to have?
How does the gastrovascular cavity open to the environment?
What is the sister phylum of Cnidarians?
What are Ctenophora?
What are Ctenophora and Cnidaria grouped together as?
What is a big difference between Ctenophora and Cnidaria?
Cnidaria have cnidocytes and dimorphism is common in them
presence in a species of more than morphological kind of individual
-polyp and medusa
What is another name for the polyp form?
How do polyps move?
they don't (sessile)
What is another name for the medusa form?
What type of movement do medusa have?
What class is considered the "true jellies"?
How do polyps reproduce?
How do medusa reproduce?
Are medusa diploid or haploid?
Are polyps diploid or haploid?
Are Cnidarian gametes diploid or haploid?
Why are hydras atypical of the class hyrdozoa?
no medusa stage
Do hydra live in solitude or colonies?
Are hydras freshwater or marine?
Is obelia marine or freshwater?
Do Obelia live in solitude or colonies?
Are Obelia polyps or medusa bigger?
Which species of hydrozoa are more plantlike or animal-like in appearence?
Is Gonionemus freshwater or marine?
Are Gonionemus polyps or medusa bigger?
How are medusa produced?
Where are hydras found?
pools, quiet springs, and spring ponds--- underneath vegetation
conical area surrounded by tentacles that bears the mouth
Where are the testes located in a hydra?
bud on its side at the oral end
tiny lid of a cnidocyte that pops off when the nematocyst discharges
thin, jelly like layer that acts as an elastic skeleton and provides strength and flexibility
Where does extracellular digestion begin?
tiny hairlike triggers projecting from nematocytes,help discharge the nematocyst
What structure gives a warty appearance on the surface of the tentacles?
how a hydra sticks to surfaces- on the aboral surface
stinging organelle of a cnidocyte
Which cells develop to replace cnidocytes?
What type of cells make up the epidermis of hydra?
Where is the nerve net located?
Right below the epidermal layer
small dark embryonic cells that can be found at the bases of epitheliomuscular cells
secrete mucus onto the body
noncellular layer between the epidermis and gastrodermis, elastic skeleton
What do nutritive-muscular cells do?
-allow the hydra to change shape
-discharge enzymes to the gastrovascular cavity
-cilia keep food circulating
What cells make up the gastrodermis?
What cells are found in both the epidermis and gastrodermis?
organism has both male and female reproductive parts
organism is either male or female
Where are sex organs found in hydra?
What do testes contain?
What side of a hydra are the ovaries found?
the basal end
Where does a hydra zygote form?
attached to the parent
having multiple stages (both polyp and medusa)
What does an Obelia colony arise from?
rootlike fixture used for attachment
the living part of the colony
What secretes the persarc?
thin, protective covering of the coensarc
another name for a polyp
Which polyp of Obelia have tentacles
grow on a stalk in the gongangia
pore in the gongangia young medusae escape from
found in protected costal and bay areas
jellyfish of the class Scyphozoa
convex/aboral surface fof a medusae
concave (oral) surface of a medusae
make and store nemocysts, help in extracellular digestion, act as sensory organs
organs of equilibrium, little sacs containing calcareous secretions
circular shelflike membrane that aids in subumbrellar movement
suspended from the central surface of the subumbrellar cavity with the mouth at the distal end
surrounds the mouth (x4)
Wht does the gastrovasuclar cavity contain?
gullet, stomach, four radial canals,ring canal
is the mesoglea thicker in the medusa or hydroi form?
Is the mesoglea thicker in hydromedusae or scyphomedusae?
lacks a velum
body arranged uun multiples of 4
teramerous radial symmetry
arranged in furs
Are scyphozoans monoiceous or diecous?
Where d embryos develop in scyphozoans?
larvae of sscyphozoans, free swimming
where planular larvae attach to mature
buds off youn scyphoxzoan medusae
young scyphozoan medusae
lion's mane jellyfish
sense organ containing a statacyst and ocellus
flanks the rhopalium
what are orl arms modifications of?
where re the gonads located in scyphozoan medusae
digestive canal that follows the outer margin
stomach and canal system that resembles a wheel
medusoid gut (scyphozoan)
What tye of digestion do scyphozoan medusae have?
intracellular and extracellular
What bis the most common sea anaenome on the Atlatic coast?
What class lacks a medusa?
anthozoan white thradlike structure containing nematocysts usded for defense?
3 regions of a sea anenomae
oral idsc, basal disc, cylindrical coulumn
smooth surfaced ciliated groove surrounding ananomae's mouth, circulates water
smooth space between the outh and tentacles
separates the gastrovasular cavity into 6 chambers
resembles stacks of coins
what class does coral belong to?
rim of coral cup
radial paritions within the theca
Which class has both polyps and medusa, though one may supressed, velum presetnt
true jellyfish, medusa dominant, no velum, solitary
soliatry, no medusa, clusters of 8 bdy plan
solitary, reduced polyp, square medusa cross section, no velum but has a velarium
all polyps, no medusae, gastrovasular caivities separated by mesentaries