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LABORATORIO:Parte2
FiloPoriferaEJERCICIO7113‐120(EDITION14TH)
109‐119(EDITION15TH)
Goalsfortoday
• LearntorecognizedthePhylumPoriferafromotheranimals
• Learnthemain‘diagnosLc’characterisLcs
• Learnaboutsomespongesbiology
Porifera
Thesearethesimplestmetazoans
• LiPleornoLssueorganizaLon
• SaidtobelongtothecellularleveloforganizaLon.
• Noorgans,nosystems,nomouth,ordigesLvetract,onlyrudimentarynervousintegraLons.
• Nogermlayers(soneitherdiploortriploblasLc)
• Somehavesymmetrysomedon’t
Porifera
Parazoa
Radiata
Deu
terostom
ia
Ecdysozoa
Loph
otrochozoa
Eumetazoa
Bilateria
Protostomia
Cnidariaand
Cten
opho
ra
Parazoa
Ancestralcolonialchoanoflagellate
Porifera
Maincharacteris@csofspongesare:
• Poresandcanalsystems(asconoid,siconoid,andleuconoid)
• Flagellatedspongefeedingcells=choanocytes.
• Internalskeletonsofspiculesororganicfibers(spongin).
• Internalcavity=spongocoelthatopenstoanosculum
Porifera
• Mostaremarine
• Freshwaterspeciesarefoundinpondsandstreams
• Solitaryorcolonial• Adultsaresessile
Porifera:Classifica@on
Calcarea:
• Spiculesofcalciumcarbonate
• Needle‐shapedor3‐4rayedspicules• Canalsystemsasconoid,siconoid,or
leuconoid
• Allmarine
Asconoide Siconoide Leuconoide
Classes:
Hexac@nellida:
• 3D,six‐rayedspicules
• Siliceousspiculesforminganetwork• Bodyo_encylindricalorfunnel‐shaped.
• Canalsystemssiconoidorleuconoid
• Allmarine,andmostdeepwaterspp.
Demospongiae:
• Siliceousspicules(notsix‐rayed),sponginorboth
• Canalsystemsleuconoid
• Onefamilyfreshwater,mostmarine
• Mostspongesbelongtothisclass
Porifera:YourTasksExercise7:
– Phylum:Porifera(sponges)– ClassCalcarea
• Genus:Sycon(=Scypha,Gran3a)
Sycon has a syconoid canal system Marine
Porifera:Sycon
1. PutapreservedSyconinapetridishforyoutotakealookattheshape,osculum,andspicules.ThereisalsoamodelofSycon,learnaboutitsparts
Porifera:Sycon2.Takeaslidefromyourboxwith(Sycon,GranLa,or
Scypha)thisisacrosssecLoncut:idenLfytheincurrentcanal,spongocoel,andtheradialcanal
Water enters the incurrent canals and passes through minute openings called? ____________
Check your book for answers!
Porifera:Sycon2.Takeaslidefromyourboxwith(Sycon,GranLa,or
Scypha)thisisacrosssecLoncut:idenLfytheincurrentcanal,spongocoel,andtheradialcanal
What is the apopyle? Check your book!
Porifera:Sycon3.Takeaslidefromyourboxwith(Sycon,GranLa,orScypha)
inalongitudianalcrosssecLonyouwouldseethefollowingspecializedcells:whataretheirfunc@on?
Porifera:YourTasksExercise7:
– Phylum:Porifera(sponges)– ClassCalcarea
• Genus:Leucosolenia
Leucosolenia has an asconoide canal system
Porifera:Leucosolenia
1. Trytofindtheosculum.Thisisacolonialspeciesoftubularindividualsinvariousstagesofdevelopment
osculum
Porifera:Leucosolenia
2.LookinthemicroaslideofLeucosoleniabodyanditsspicules
Porifera:YourTasksExercise7:
– Phylum:Porifera(sponges)– ClassHexac@nellida
• Genus:Euplectella
Porifera:YourTasks
Some species of Euplectella have a commensal relationship with a shrimp species. A young male and female shrimp enter the central cavity and live there. As they grow they become too large to escape through the sieve-like covering of the osulum, and so spend their entire life inside the sponge.
1.LookatpreservedspecimensofEuplectella
Porifera:YourTasksExercise7:
– Phylum:Porifera(sponges)– ClassDemonspongiae
• Gemmulas(asexualreproduc3vestructures)
Gemmules are asexual reproductive structures of freshwater sponges and some marine sponges of the class Demonspogiae
What is their function in reproduction?
ImportantLinksPorifera
http://bioweb.uwlax.edu/zoolab/Table-Of-Contents.htm
http://faculty.uml.edu/rhochberg/hochberglab/Courses/InvertZool/Quizes/Porifera%20Quiz%201.html
http://www.bumblebee.org/invertebrates/Porifera.htm