Biology Reference
In-Depth Information
Figure 8:
Members of Stigonematales.
Fischerella
sp. (A),
Hapalosiphon
sp. (B)
, Westiellopsis
sp. (C), Magnifi cation bar represents 5
µm (A and C) and 10 µm (C). Pictures courtesy G. L. Tiwari, Department of Botany, University of Allahabad, Allahabad-211002,
India.
and genetic characterization of cyanobacteria based on pure culture techniques, Stanier
et al
. (1978)
proposed the inclusion of cyanobacteria under the provisions of International Code of Nomenclature
of Bacteria. In doing so, they emphasized that properties common to and distinctive to all bacteria
may be extended to cyanobacteria. Accordingly, in bacterial taxonomy (Rule 18a) the type species
and (through type species) genus is represented by living cultures of a strain so designated. They also
cited Bacteriological Code of a Rule (18h) that permits the replacement of cultures by a description,
a preserved specimen or an illustration of strains giving them the status of holotypes as has been
permitted in case of myxobacteria. However, this provision seems to have been withdrawn with
effect from November, 2000 (De Vos and Trüper, 2000). Rippka
et al
. (1979) suggested a classifi cation
based on bacteriological code and divided the cyanobacteria into fi ve sections. In Section I and
Section II members belonging to the orders Chroococcales; Chamaesiphonales and Pleurocapsales
as suggested in the Botanical Code have been redistributed. Section III entirely consists of
non-heterocystous fi lamentous cyanobacteria and Sections IV and V comprise heterocystous,
