Activity 17_prelab Phylum Cnidaria

Ac tivi ty 1 7: Ph ylu m Cn idaria Pre-Lab Discussion

CNIDARIANS 

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Includes radially symmetrical animals Most primitive eumetazoan – Exhibit tissue level organization Diploblastic tissues with mesoglea Coeleteron/Gastrovascula r cavity – with one opening – Functions for metabolism and as a hydroskeleton

CNIDARIAN SKELETONS 

Exoskeleton – Chitinous – Calcareous – Proteinaceous

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Hydroskeleton

CNIDARIAN NERVOUS SYSTEM Protoneuron – primitive nervous system  Statocyst – a.k.a. statoliths – for gravity  Ocelli – primitive eyes 

CNIDARIAN LOCOMOTORY SYSTEM 

Epitheliomuscular

NEMATOCYST  

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stinging organelle For capturing prey and for defense Within speciallized cells called CNIDOCYTES Releases NEUROTOXINS

CNIDARIAN POLYMORPHISM  

Testis Testis Testis Testi Testi s s

POLYP – cylindrical MEDUSA – umbrellashaped Testis Testis Testis Ovary Testis Testis

Testis Testis

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MONOECIOUS DIOECIOUS

CNIDARIAN LIFE CYCLE  

POLYP – cylindrical MEDUSA – umbrella-shaped

Classes    

Hydrozoa Scyphozoa Cubozoa Anthozoa – – –

Subclass Zoantharia Subclass Ceriantipatharia Subclass Alconaria

OBSERVE THE FOLLOWING:        

Hydra – microscopic Obelia – microscopic Physalia – Portuguese Man O’ War Aurelia – true jelly fish; moon jelly Metridium – sea anemone Antipathes – black coral Fungia – Mushroom coral Tubipora – organ pipe coral

Obelia Hydra

Metridium

Fungia

Tubipora Physalia Aurelia

Acropora

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