Tabular Form of Bacterial Classification From David Bergey's Manual
This
part
includes
one
family
namely Methanobacteriaceae
with
three
genera
Methanobacterium,
Methanococcus
and
Methanosarcina.
Cells
are
rods
or
cocci,
motile
or
non-motile,
Gram
variable,
strict
anaerobes
which
reduce
CO2
to
methane.
Energy
is
derived
for
growth
by
the
reduction
of
CO2
and
by
utilizing
electrons
generated
in
the
oxidation
of
hydrogen
or
formate.
Methanosarcina
can
also
ferment
acetate
and
methanol
to
form
methane
and
CO2.
A
highly
specialized
physiological
group,
does
not
utilize
carbohydrates
or
proteinaceous
materials
or
organic
compounds
other
than
those
listed
above.
The
genus
Methanobacterium
contains
rods
or
chain
forming
lancet
shape
coccoids
whereas
the
genus
Methanosarcina
contains
large
cocci
in
packets
and
the
genus
Methanococcus
contains
cocci
occurring
singly,
in
pairs
or
in
clumps.