Comparison of the 16S rRNA gene sequence determined for Chitinophaga pinens
is showed that this species is most closely related to Flexibacter filiform
is in the Flexibacter-Bacteroides-Cytophaga phylum, These two chitinolytic
bacteria, which are characterized by transformation into spherical bodies o
n ageing, belong to a strongly supported lineage that also includes Cytopha
ga arvensicola, Flavobacterium ferrugineum and Flexibacter sancti, The line
age is distinct from the microcyst-forming species Sporocytophaga myxococco
ides.