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Castellaniella gen. nov., to accommodate the phylogenetic lineage of Alcaligenes defragrans, and proposal of Castellaniella defragrans gen. nov., comb. nov. and Castellaniella denitrificans sp. nov.

¹ Institut für Angewandte Mikrobiologie, Justus Liebig Universität, IFZ – Heinrich-Buff-Ring 26–32, D-35392 Giessen, Germany
² Department of Biology, The University of Konstanz, D-78457 Konstanz, Germany
³ Department of Biological Sciences, Korean Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejon, 305-701, Republic of Korea
⁴ Institut für Bakteriologie, Mykologie und Hygiene, Veterinärmedizinische Universität Wien, Veterinärplatz 1, A-1210 Wien, Austria

Correspondence
P. Kämpfer
peter.kaempfer{at}agrar.uni-giessen.de

Comparative 16S rRNA gene sequence analysis indicates that two distinct sublineages exist within the genus Alcaligenes: the Alcaligenes faecalis lineage, comprising Alcaligenes aquatilis and A. faecalis (with the three subspecies A. faecalis subsp. faecalis, A. faecalis subsp. parafaecalis and A. faecalis subsp. phenolicus), and the Alcaligenes defragrans lineage, comprising A. defragrans. This phylogenetic discrimination is supported by phenotypic and chemotaxonomic differences. It is proposed that the A. defragrans lineage constitutes a distinct genus, for which the name Castellaniella gen. nov. is proposed. The type strain for Castellaniella defragrans gen. nov., comb. nov. is 54Pin^T (=CCUG 39790^T=CIP 105602^T=DSM 12141^T). Finally, on the basis of data from the literature and new DNA–DNA hybridization and phenotypic data, the novel species Castellaniella denitrificans sp. nov. (type strain NKNTAU^T=DSM 11046^T=CCUG 39541^T) is proposed for two strains previously identified as strains of A. defragrans.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains NKNTAU^T and TJ4 are U82826 and AF508102, respectively.

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