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Animal Origins and the First Animals - Lecture Slides | BI 102, Study notes of Biology

Material Type: Notes; Professor: Moodie; Class: General Biology II; Subject: Biology; University: Central Oregon Community College; Term: Unknown 2006;

Typology: Study notes

Pre 2010

Uploaded on 08/18/2009

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Sponges
Animal Origins and the First
Animals
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Download Animal Origins and the First Animals - Lecture Slides | BI 102 and more Study notes Biology in PDF only on Docsity!

Animal Origins and the First

Animals

When did Multicellularity

Evolve?

  • Fossil Record
    • Multicellular animal fossils found around 580 million years ago.

Colonial Choanoflagellates

Sponges

B

A

First Multicellularity PRECAMBRIAN Animals

~ 600- million years ago

First phyla to diverge

Sponge Anatomy

  • Two layers thick
  • Outside
    • Epidermis (skin layer)
  • Inside…

Sponge Anatomy

  • Choanocytes are flagellated collar cells: trap & ingest food particles...

Sponge Form & Function

  • Amoebocytes secrete skeletal materials:
  • Supporting structures called spicules, softer material called spongin.

spongin

types of spicules

Sponge Form & Function

Sponges

Sponge Body Types

  • Tube w/Canals
    • dermal pores
    • incurrent canals
    • choanocytes line radial canals
    • empties into spongocoel & out osculum.

incurrent canal

choanocyte

dermal pore

radial canal spongocoel

osculum

Sponges

Sponge Body Types

  • Complex Canals
    • dermal pores
    • incurrent canals
    • choanocytes line chambers
    • excurrent canals
    • lead to osculum.

incurrent canal

choanocyte

dermal pore

flagellated chamber

excurrent canal

Phylogeny of Sponges

Glass

Sponges

Calcite^ Demospongiae

Sponges

Phylogeny of Sponges

Glass

Sponges

Calcite^ Demospongiae

Sponges

Examples of Sponges

Glass sponges

Examples of Sponges