Classes of Phylum Porifera
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Questions and Answers

What are the three classes of the Phylum Porifera?

Calcarea, Hexactinellida, Demospongiae

What organisms belong to the Class Calcarea?

Sycon, Leucoselenia

What organisms belong to the class Hexactinellida?

Euplectella

Describe the asconoid type of canal system.

<p>Water enters through dermal pores and flows into the atrium. Choanocyte flagella create a current that flows water out of the osculum.</p> Signup and view all the answers

Describe the Syconoid type of canal system.

<p>Water flows into the incurrent canals via dermal ostium through prosopyles and flows out of apopyles into the excurrent canal to the spongocoel and through the ostium.</p> Signup and view all the answers

Where do the choanocytes reside in the Syconoid canal system?

<p>Radial Canals</p> Signup and view all the answers

Where do the choanocytes line in the asconoid canal system?

<p>Spongocoel</p> Signup and view all the answers

Where do the choanocytes reside in the Leuconoid canal system?

<p>Distinct 'flagellated' chambers</p> Signup and view all the answers

What are amphiblastula larvae and in what organisms do they appear?

<p>Amphiblastula larvae appear in the radial canals of Scyconoids.</p> Signup and view all the answers

What is the distinguishing feature of Euplectella?

<p>Glassy</p> Signup and view all the answers

Where are spongin fibers commonly found?

<p>In Demospongiae</p> Signup and view all the answers

What organism is this? (scypha/sycon)

<p>Scypha or Sycon</p> Signup and view all the answers

What class does this organism belong to? (Calcarea)

<p>Class Calcarea</p> Signup and view all the answers

What sponge is this? (Euplectella)

<p>Euplectella</p> Signup and view all the answers

What is the taxonomy for Sycon?

<p>Phylum Porifera, Class Calcarea</p> Signup and view all the answers

What is the taxonomy for Leucosolenia?

<p>Phylum Porifera, Class Calcarea</p> Signup and view all the answers

What is the taxonomy for Euplectella?

<p>Phylum Porifera, Class Hexactinellida</p> Signup and view all the answers

What organism is this? (leucosolenia)

<p>Leucosolenia</p> Signup and view all the answers

What organism is this? (sycon)

<p>Sycon</p> Signup and view all the answers

What organism is this? (sycon or scypha)

<p>Sycon or Scypha</p> Signup and view all the answers

What are the 3 types of spicules?

<p>Calcareous, Silicous, Spongin</p> Signup and view all the answers

What kind of spicules do Class Calcarea have?

<p>Calcium carbonate</p> Signup and view all the answers

What kind of spicules do Class Hexactinellida have?

<p>Silicous spicules</p> Signup and view all the answers

What kind of spicules do Demospongiae have?

<p>Spongin</p> Signup and view all the answers

Study Notes

Classes of Phylum Porifera

  • Three classes: Calcarea, Hexactinellida, and Demospongiae.

Organisms in Calcarea

  • Examples include Sycon and Leucosolenia.

Organisms in Hexactinellida

  • Example organism: Euplectella.

Asconoid Canal System

  • Water enters through dermal pores, flows into the atrium.
  • Choanocyte flagella create a current, expelling water through the osculum.

Syconoid Canal System

  • Water flows into incurrent canals via dermal ostium, through prosopyles.
  • Exits via apopyles into the excurrent canal leading to the spongocoel and out through the ostium.

Choanocyte Location in Canal Systems

  • In the Syconoid canal system, choanocytes reside in radial canals.
  • In the Asconoid system, choanocytes line the spongocoel.
  • In the Leuconoid system, choanocytes are found in distinct 'flagellated' chambers.

Amphiblastula Larvae

  • Amphiblastula larvae appear in the radial canals of Scyconoids.

Distinguishing Feature of Euplectella

  • Euplectella is known for its glassy appearance.

Location of Spongin Fibers

  • Spongin fibers are commonly found in Demospongiae.

Taxonomy of Sycon

  • Phylum Porifera, Class Calcarea.

Taxonomy of Leucosolenia

  • Phylum Porifera, Class Calcarea.

Taxonomy of Euplectella

  • Phylum Porifera, Class Hexactinellida.

Identifications

  • Leucosolenia is a notable organism in Calcarea.
  • Sycon (or Scypha) refers to organisms in Calcarea.

Types of Spicules

  • Three types: Calcareous, Silicous, and Spongin.

Spicule Composition by Class

  • Class Calcarea has calcareous spicules.
  • Class Hexactinellida features silicous spicules.
  • Class Demospongiae is characterized by spongin fibers.

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Description

This quiz covers the classes of Phylum Porifera, including Calcarea, Hexactinellida, and Demospongiae. It explores the unique canal systems, the organisms within each class, and the distinct features of each type. Test your knowledge on sponge anatomy and reproductive strategies.

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