LABORATORIO: Parte 2 Filo Porifera
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1 LABORATORIO: Parte 2 Filo Porifera EJERCICIO (EDITION 14 TH ) (EDITION 15 TH)
2 Goals for today Learn to recognized the Phylum Porifera from other animals Learn the main diagnoslc characterislcs Learn about some sponges biology
3 Porifera These are the simplest metazoans Parazoa Porifera Parazoa Cnidaria and Ctenophora Radiata Lophotrochozoa Ecdysozoa Protostomia Eumetazoa Bilateria Deuterostomia LiPle or no Lssue organizalon Said to belong to the cellular level of organizalon. No organs, no systems, no mouth, or digeslve tract, only rudimentary nervous integralons. No germ layers (so neither diplo or triploblaslc) Some have symmetry some don t Ancestral colonial choanoflagellate
4 Porifera Main of sponges are: Pores and canal systems (asconoid, siconoid, and leuconoid) Flagellated sponge feeding cells= choanocytes. Internal skeletons of spicules or organic fibers (spongin). Internal cavity= spongocoel that opens to an osculum
5 Porifera Most are marine Freshwater species are found in ponds and streams Solitary or colonial Adults are sessile
6 Porifera: Classes: Calcarea: Spicules of calcium carbonate Needle shaped or 3 4 rayed spicules Canal systems asconoid, siconoid, or leuconoid All marine Hexac@nellida: 3D, six rayed spicules Siliceous spicules forming a network Body o_en cylindrical or funnel shaped. Canal systems siconoid or leuconoid All marine, and most deep water spp. Asconoide Siconoide Leuconoide Demospongiae: Siliceous spicules (not six rayed), spongin or both Canal systems leuconoid One family freshwater, most marine Most sponges belong to this class
7 Porifera: Your Tasks Exercise 7: Phylum: Porifera (sponges) Class Calcarea Genus: Sycon (=Scypha, Gran3a) Sycon has a syconoid canal system Marine
8 Porifera: Sycon 1. Put a preserved Sycon in a petri dish for you to take a look at the shape, osculum, and spicules. There is also a model of Sycon, learn about its parts
9 Porifera: Sycon 2. Take a slide from your box with (Sycon, GranLa, or Scypha) this is a cross seclon cut: idenlfy the incurrent canal, spongocoel, and the radial canal Water enters the incurrent canals and passes through minute openings called? Check your book for answers!
10 Porifera: Sycon 2. Take a slide from your box with (Sycon, GranLa, or Scypha) this is a cross seclon cut: idenlfy the incurrent canal, spongocoel, and the radial canal What is the apopyle? Check your book!
11 Porifera: Sycon 3. Take a slide from your box with (Sycon, GranLa, or Scypha) in a longitudianal cross seclon you would see the following specialized cells: what are their func@on?
12 Porifera: Your Tasks Exercise 7: Phylum: Porifera (sponges) Class Calcarea Genus: Leucosolenia Leucosolenia has an asconoide canal system
13 Porifera: Leucosolenia 1. Try to find the osculum. This is a colonial species of tubular individuals in various stages of development osculum
14 Porifera: Leucosolenia 2. Look in the micro a slide of Leucosolenia body and its spicules
15 Porifera: Your Tasks Exercise 7: Phylum: Porifera (sponges) Class Genus: Euplectella
16 Porifera: Your Tasks 1. Look at preserved specimens of Euplectella 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.
17 Porifera: Your Tasks Exercise 7: Phylum: Porifera (sponges) Class Demonspongiae Gemmulas (asexual reproduc3ve structures) Gemmules are asexual reproductive structures of freshwater sponges and some marine sponges of the class Demonspogiae What is their function in reproduction?
18 Important Links Porifera Contents.htm hochberglab/courses/invertzool/quizes/ Porifera%20Quiz%201.html Porifera.htm
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