Biology of Aspatharia sinuata Diagram Slides only
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Transcript Biology of Aspatharia sinuata Diagram Slides only
Biology of
Aspatharia sinuata
Delivered by
SHITTU Olalere
Dept. of Zoology,
University of Ilorin, Nigeria
External Shell Characteristics
Internal Shell Characteristics
Internal Shell Characteristics
Internal Shell Characteristics
The Mantle Cavity
The posterior edges of the mantle folds are modified
to form dorsal excurrent and ventral incurrent
openings.
Gills
The mantle and gills of
bivalves are involved in
gaseous exchange.
The gills are modified for
filter feeding, they originated
from the primitive ctenidia by
elongation of the filaments on
both sides of the central axis.
The end of the filaments folds
backward to make the
ctenidia filament assume a
slender W shape.
Section through heart and Gills
Feeding
Feeding mechanism
Anatomy of the Internal Organs of Bivalves
Anatomy of the Heart
Reproduction and Development
The glochidia larvae
seeks, attach to fins and
gills of fishes where they
encyst.
Fishes serve as agent of
dispersal.
Encysted glochidia larvae
undergo metamorphosis
into adults which escape
from the cyst and sink to
the bottom of muds.
Life Cycle of Bivalves
Marine forms
exhibits
external
fertilization
Veliger larva
swims
for
about
two
weeks before
spat
formation.
Four years to
reach
adulthood.
End of presentation
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