phylum cnidaria-radiate animals

Phylum Cnidaria-Radiate Animals • Tissue level of organization • 2 Germ layers • Hydrostatic Skeleton • Gastrovascular Cavity- for digestion • Polymorphism • Polyp (sessile) and Medusa (free-living) stages

Class Hydrozoa

1. Lifestyle- Both polyp and medusa stages dominant 2. Reproduction- asexual by budding or sexual 3. 10 tentacles 4. Ex: Obelia, Obelia medusae, Hydra, Hydra reproductive stages

Class Scyphozoa- True Jellyfish

1. Lifestyle- Solitary- Medusa-stage dominant 2. Ex: Aurelia, Aurelia lifecycle

Class Anthozoa

1. Lifestyle- Polyp stage dominant 2. Gastrovascular cavity divided into mesenteries 3. Ex: Mertidium, Metridium dissection

Return to original outline Return to phyla outline

Class Hydrozoa Hydra

C.S L.S 100X

W.M Male Female


Hydra

40X W.M


Budding 40X

Spermary Ovary

40X


Obelia

Obelia Colony 40X


Medusae

100x


Class Scyphozoa

Aurelia Lifecycle

Planula 100x

Schyphistoma 100x

Strobila 100x

Ephrya 40x


Aurelia


http://biodidac.bio.uottawa.ca/Thumbnails/showimage.cfm?File_name=HYDR037P&File_type=GIF

Class Anthozoa

Metridium

LS CS Dissection scope


Metridium


Phylum Porifera-The Sponges • Multicellular • Cellular level of organization • No division of labor among cells • No body systems, no organs, no mouth/digestive tract • No germ layers • Pores and canal systems

Class Calcarea

1. Spicule type- calcium carbonate 2. Canal system- asconoid, leuconoid and syconoid 3. Marine 4. Ex: Grantia (a.k.a Sycon), Grantia spicules

Class Hexactinellida

1. Spicule type- siliceous 2. Canal system- syconoid or leuconoid 3. Marine 4. Ex: Euplectella (Venus’s flower basket)

Class Demospongiae

1. Spicule type- Siliceous, spongin 2. Canal system- Leuconoid 3. Marine, except one family 4. Ex: Spongia, Spongilla

Representative Porifera

Sponge Types: Asconoid- characterized by a simple stalk-like spongocoel surrounded by a single layer of choanocytes. Choanocytes are cells that have flagella, which beat to create a current push through the spongocoel. Syconoid- a tubular body whose wall is much thicker and highly folded into a series of incurrent canals that deliver water into radial canals lined with choanocytes. Leuconoid- the most complex level of organization, that allows an increase in body size. Clusters of flagellated chambers are filled from incurrent canals and discharge their water via excurrent canals into a central osculum.


http://en.wikipedia.org/wiki/Choanocyte

http://en.wikipedia.org/wiki/Flagella

Class Calcarea

Grantia

Grantia 100x

100x


Grantia spicules

100x


Class Demospongiae

Spongia

Spongin Tissue

100x


Representative Porifera

Syconoid

Grass Sponge


Bath sponge- Leuconoid


phylum cnidaria-radiate animals

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