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BIOL (2,000)
BIOL 2030 (100)
Lecture 5

BIOL 2030 Lecture Notes - Lecture 5: Basal Lamina, Microvillus, Choanocyte


Department
Biology
Course Code
BIOL 2030
Professor
Tamara Kelly
Lecture
5

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Phylum Porifera (sponges) Lecture 5
Phylum Porifera
CLASS
CALCAREA
HEXACTINELLIDA
DEMOSPONGIAE
(80%)
HOMOSCLEROMORPHA
(found only is 6th ed of textbook ONLY)
Spicules
(needle
like
structure)
Calcium
carbonate
Siliceous
Six-rayed
Siliceous
NOT six rayed(
Simple siliceous OR none
?
Spongin
-sponges
are solid
because
of
spongin
(fibers
that form
the
skeleton
of
sponges)
Absent
Absent
Present
Absent, type IV collagen
-Integral feature of the
basement membrane of
epithelium in higher (more
sophisticated) animals some
have tissue lvl of organization
due to collagen forming a
basement membrane under
certain structures that are
epithelial like
Habitat
Marine
Marine, deep sea
Marine &
freshwater
Marine, inshore
(
Exhibit cellular level of organization ! only contains cells NO tissue or organs(
o Multicellular animals (
o However, recent studies have shown that some exhibit tissue level of organization(
" Some Homoscleromorpha (
Share few characteristics with Metazoans (sometimes referred to as Parazans)(
Sessile aquatic filter feeders(
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o Some can “crawl” up to 4mm/day(
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