Activity 17: Activity 17: Phylum CnidariaPhylum CnidariaActivity 17: Activity 17: Phylum CnidariaPhylum CnidariaPre-Lab DiscussionPre-Lab DiscussionPre-Lab DiscussionPre-Lab Discussion

CNIDARIANSCNIDARIANSCNIDARIANSCNIDARIANS Includes radially Includes radially

symmetrical animalssymmetrical animals Most primitive Most primitive

eumetazoaneumetazoan– Exhibit tissue level Exhibit tissue level

organizationorganization DiploblasticDiploblastic tissues with tissues with

mesogleamesoglea Coeleteron/Coeleteron/

Gastrovascular cavity Gastrovascular cavity – with one openingwith one opening– Functions for Functions for

metabolism and as a metabolism and as a hydroskeletonhydroskeleton

Includes radially Includes radially symmetrical animalssymmetrical animals

Most primitive Most primitive eumetazoaneumetazoan– Exhibit tissue level Exhibit tissue level

organizationorganization DiploblasticDiploblastic tissues with tissues with

mesogleamesoglea Coeleteron/Coeleteron/

Gastrovascular cavity Gastrovascular cavity – with one openingwith one opening– Functions for Functions for

metabolism and as a metabolism and as a hydroskeletonhydroskeleton

CNIDARIAN CNIDARIAN SKELETONSSKELETONSCNIDARIAN CNIDARIAN SKELETONSSKELETONS

ExoskeletonExoskeleton– ChitinousChitinous– Calcareous Calcareous – Proteinaceous Proteinaceous

HydroskeletonHydroskeleton

ExoskeletonExoskeleton– ChitinousChitinous– Calcareous Calcareous – Proteinaceous Proteinaceous

HydroskeletonHydroskeleton

CNIDARIAN NERVOUS CNIDARIAN NERVOUS SYSTEMSYSTEMCNIDARIAN NERVOUS CNIDARIAN NERVOUS SYSTEMSYSTEM

ProtoneuronProtoneuron – primitive nervous system– primitive nervous system StatocystStatocyst – a.k.a. statoliths– a.k.a. statoliths

– – for gravityfor gravity OcelliOcelli – – primitive eyesprimitive eyes

ProtoneuronProtoneuron – primitive nervous system– primitive nervous system StatocystStatocyst – a.k.a. statoliths– a.k.a. statoliths

– – for gravityfor gravity OcelliOcelli – – primitive eyesprimitive eyes

CNIDARIAN CNIDARIAN LOCOMOTORY SYSTEMLOCOMOTORY SYSTEMCNIDARIAN CNIDARIAN LOCOMOTORY SYSTEMLOCOMOTORY SYSTEM

EpitheliomuscularEpitheliomuscular EpitheliomuscularEpitheliomuscular

NEMATOCYSTNEMATOCYSTNEMATOCYSTNEMATOCYST stinging organellestinging organelle For capturing prey and for For capturing prey and for

defensedefense Within speciallized cells called Within speciallized cells called

CNIDOCYTESCNIDOCYTES Releases Releases NEUROTOXINSNEUROTOXINS

stinging organellestinging organelle For capturing prey and for For capturing prey and for

defensedefense Within speciallized cells called Within speciallized cells called

CNIDOCYTESCNIDOCYTES Releases Releases NEUROTOXINSNEUROTOXINS

CNIDARIANCNIDARIAN POLYMORPHISMPOLYMORPHISMCNIDARIANCNIDARIAN POLYMORPHISMPOLYMORPHISM POLYPPOLYP – cylindrical– cylindrical MEDUSAMEDUSA – umbrella-– umbrella-

shapedshaped

POLYPPOLYP – cylindrical– cylindrical MEDUSAMEDUSA – umbrella-– umbrella-

shapedshaped

MONOECIOUSMONOECIOUS DIOECIOUSDIOECIOUS

MONOECIOUSMONOECIOUS DIOECIOUSDIOECIOUS

Ovary

Testis

TestisTestis

TestisTestisTestisTestis

TestisTestisTestis Testis

Testis

CNIDARIANCNIDARIAN LIFE CYCLELIFE CYCLECNIDARIANCNIDARIAN LIFE CYCLELIFE CYCLE POLYPPOLYP – cylindrical– cylindrical MEDUSAMEDUSA – –

umbrella-shapedumbrella-shaped

POLYPPOLYP – cylindrical– cylindrical MEDUSAMEDUSA – –

umbrella-shapedumbrella-shaped

ClassesClassesClassesClasses

HydrozoaHydrozoa ScyphozoaScyphozoa CubozoaCubozoa AnthozoaAnthozoa

– Subclass ZoanthariaSubclass Zoantharia– Subclass CeriantipathariaSubclass Ceriantipatharia– Subclass AlconariaSubclass Alconaria

HydrozoaHydrozoa ScyphozoaScyphozoa CubozoaCubozoa AnthozoaAnthozoa

– Subclass ZoanthariaSubclass Zoantharia– Subclass CeriantipathariaSubclass Ceriantipatharia– Subclass AlconariaSubclass Alconaria

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

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

Hydra

Obelia

Metridium Fungia

Physalia

Tubipora

Aurelia

Acropora

…….Start.Start…….Start.Start