Phylum Cnidaria: Hydrozoa, Scyphozoa, Cubazoa, Anthonzoa

Nematocyst is triggered by ____ or ______?

Touch, Chemosensation

Cnidarian Body Plan Polyp Form:

-Tubular Body -Mouth Directed upward -Feeding tentacles around mouth -Small amount of Mesoglea -Sessile

Nematocysts function to ____?

Entangle the prey. Harpoon prey. Inject paralyzing toxin.

Solitary Hydras mouth opens to the ____ ____?

Gastrovascular cavity.

In between the tissue layers in a NON-CELLULAR jelly-like material called _______?

Mesoglea aka (jellyfish)

Class Anthozoa: At one end of the mouth or both is a ciliated groove called ________?

Siphonoglyph

Class Scyphozoa differ from Hydrozoan medusa because they lack a ____?

Velum.

Most Hydras posses ____?

-Pedal Disk -Mouth (Hypostome), surrounded by 6-10 tentacles.

TQ: Nematostella vectensis is a ________?

Anthozoan... Anthony stell watches Nemo

Class Hydrozoa: Typical life cycle includes both _____ and _____; however, freshwater Hydras and some marine Hydroids do not have a _______.

Asexual Polyps Sexual Medusa stages; Medusa Stage

Colonial Hydrozoans (Obelia) What are the 2 different kinds of individuals that comprise the colony?

Feeding Polyps (Gastrozooids) Reproductive Polyps (Gonozooids)

Class Anthozoa What does the Siphonoglyph do?

Generates a water current and brings food to the gastrovascular cavity.

Solitary anthozoans include _____?

Sea anemones

Scyphozoans: Cannonball Jellyfish scientific name is _____ ______? TQ

Stemolophus meleagris

Hydrozoan: Portuguese Man-of-War Scientific name?

TQ!!!!!! Physalia Physalis!!!!!!

Colonial Hydrozoans (Obelia) Possess a skeleton of _____ that is secreted by the _____.

Chiton, Epidermis.

Scyphozoan: Sea Nettle scientific name is _____ _____? TQ

Chysaora quinquescirra Nettle-Chrystals, 'tt' 'rr'

Cnidarian Stinging Organelles: Stinging cells are called _____?

Cnidocytes.

Cnidarians are _______?

Dioecious. (2 houses, male and female)

Phylum Cnidaria have what kind of digestive tract?

Incomplete Digestive Tract. Sac-like. Food enter & leaves the mouth, surrounded by tentacles.

Colonial Hydrozoans (Obelia) All polyps in the colony are _____?

Interconnected.

Class Scyphozoa: Jelly fish medusae are _____ and contain a lot of _____?

Larger, Mesoglea

Each Cnidocyte has a ________?

Modified Cillium (Cnidocil), armed with a stinging structure called Nematocyst.

Class Scyphozoa: The 4 Gastric pouches are connected with the _____ and _____?

Mouth, Gastrovascular system MOUTH = ANUS

Epidermis is the ________?

Outer layer of cells

Class Cubozoa have what type of eyes?

Well developed

Cnidarian Asexual reproduction is common with new individuals being produced by _________?

Budding.

Cnidarian fertilization is internal or external???

EXTERNAL!!!

Class Scyphozoa medusa is larger or smaller?

Larger

Class Anthozoa Posses a well developed _____?

Pharynx

Cnidarians have the ability regenerate _____ or ______.

-Lost body parts -A complete whole body

Class Anthozoa Edges of the septa have thread like ______, equipped with _____ and ______.

Acontia threads Nematocysts Gland cells

Cnidarian Body Plan Medusa Form:

-Bell-shaped or umbrella shaped body. -Mouth is downward. -Small tentacles are downward - A lot of Mesoglea -Motile by weak contractions of body.

Cnidarian Movement STUDYYYYYYYYYY

-Epidermis and Gastrodermis have nerve cells that are loose networks (nerve net plexus), which innervates primitively developed muscle fibers that extend from the Epidermal and Gastrodermal cells. -Stimulus in 1 part will spread across the whole body via the network.

Portuguese Man-of-War (Physalia Physalis) Description:

-Single gas-filled float with tentacles. -Tentacles house the polyps and modified medusae of the colony.

Cnidarian Nutrition: See slide...

-They are carnivores with hydra and corals consuming plankton's and some of the sea anemones coming small fishes. -Only uses diffusion<<<<<<

Life Cycle of (Obelia) Colonial Hydro

1) Gonozooids release free swimming medusae. 2) Zygotes become planula larvae, then settle to become polyp colonies 3) The medusae of hydroids are smaller than jelly fish 4) Margin of the bell projects inward forming a shelf-like velum.

Phylum Cnidaria have # types of tissue layers?

2, Epidermis and Gastrodermis

Class Cubozoa have what type of tentacles?

4 evenly spaced out tentacles or bunches of tentacles.

Hydra have asexual reproduction by ____?

Budding

Most Anthozoans are _____ and secrete external skeletons composed of ______ _____.

Colonial (coral) Calcium Carbonate

Class Cubozoa are the most _____ and _____.

Deadly and dangerous

Scyphozoan Life Cycle (Aurelia) 4) Polyps undergo ____ and are released from the _____ as free swimming _____?

Differentiation Strobila EPHRA

Gastrodermis secretes _____ in the Gastrovascular cavity.

Digestive juices.

Scyphozoan Life Cycle (Aurelia) 5) _____ matures into a adult jellyfish.

EPHRA

Class Scyphozoa possess 4 _____ lined with _____?

Gastric pouches, Nematocysts

Scyphozoan Life Cycle (Aurelia) 1) Gametes develop in _______ of the gastric pouches. -Eggs and sperm are shed through the ______?

Gastrodermis Mouth

Gastrodermis is the __________?

Inner layer that lines the gut cavity or gastrovascular cavity.

Class Scyphozoa What species is a Scyphozoa?

Jelly Fish!

Hydrozoan- Hydractinia

On hermit crab shells

Sea Anemones have asexual reproduction called ______?

Pedal Laceration.

Scyphozoan Life Cycle (Aurelia) 2) Fertilized eggs develop into a _____ _____; settles onto a _____ and develops into a _____? *SCYPHISTOMA*

Planula Larva Substrate Polyp *SCYPHISTOMA*

Zygote becoming a elongated, ciliated, radially symmetrical larva that becomes sessile to another substrate is called _________?

Planula Larva!!!

Class Anthozoa stay in what form?

Polyp form. They do not have a medusa stage.

Scyphozoan Life Cycle (Aurelia) 3) Scyphistoma produces a series of _____ by _____? - *STROBILI*

Polyps Budding

Fresh water Hydras are found in ____ and ____?

Ponds and Streams.

Phylum Cnidaria body symmetry is?

Radially Symmetrical.

Class Anthozoa The gastrovascular cavity is large and petitioned by _____ or _____?

Septa or Mesenteries (Increase surface area for digestion and support)

Class Cubozoa: When viewed from above they are ____ shaped?

Square.

Class Anthozoa: Corals get energy from microscopic photosynthetic green algae known as ____ or _____ that live symbolically inside the cells of the coral.

Zooxanthellae Dinoflagellates