Observations on the genus Aerobacter with a description of two species

Abstract

A t l a n t a , Georgia W i t h i n r e c e n t y e a r s t h e r e h a s been renewed d i s c u s s i o n concerning t h e taxonomy and nomenclature of organisms c l a s s if i e d i n t h e genera K l e b s i e l l a and A e r o b a c t e r . I t h a s been

Studies on the Bacterial Flora of the Alimentary Tract of Pigs. I. Enterobacteriaceae and Other Gram‐negative Bacteria

“…Type a strains (6) produced lysine decarboxylase, urease in Hormaeche & Munilla's medium at 37" and gas from insoluble starch, and did not produce phenylalanine deaminase or arginine dihydrolase. These characters justify the inclusion of these organisms in the Klebsiella group (Report, 1958;Hormaeche & Edwards, 1958).…”

“…These strains also differed from group 1V strains in that they were lysine decarboxylase negative, produced arginine dihydrolase, and did not form gas from insoluble starch or show urease production in Hormaeche & Munilla's medium. Hormaeche & Edwards (1958) outlined the controversy concerning the nomenclature of motile organisms related to Klebsiella which have been placed in the group Cloaca (Aerobacter) (Report, 1958). They discussed the propriety of retaining the name Aerobacter for the group and defined two species.…”

Enterobacter aerogenes Hormaeche and Edwards 1960 (Approved Lists 1980) and Klebsiella mobilis Bascomb et al. 1971 (Approved Lists 1980) share the same nomenclatural type (ATCC 13048) on the Approved Lists and are homotypic synonyms, with consequences for the name Klebsiella mobilis Bascomb et al. 1971 (Approved Lists 1980)

“…The name Enterobacter aerogenes Hormaeche and Edwards 1960 (Approved Lists 1980) was created by Hormaeche and Edwards [1] for a taxon at the rank of species that had previously been known as 'Aerobacter aerogenes' [2]. In recognizing the fact that the non-motile strains of 'Aerobacter aerogenes' were members of the species Klebsiella pneumoniae (Schroeter 1886) Trevisan 1887, Hormaeche and Edwards [2] proposed that the genus 'Aerobacter' (Beijerinck 1900) be restricted to taxa that could be distinguished from the genus Klebsiella and retained the use of the name 'Aerobacter aerogenes' in a sense different to previous usage [2].…”

“…In recognizing the fact that the non-motile strains of 'Aerobacter aerogenes' were members of the species Klebsiella pneumoniae (Schroeter 1886) Trevisan 1887, Hormaeche and Edwards [2] proposed that the genus 'Aerobacter' (Beijerinck 1900) be restricted to taxa that could be distinguished from the genus Klebsiella and retained the use of the name 'Aerobacter aerogenes' in a sense different to previous usage [2]. In realising that this solution was also not sensible they withdrew that proposal and made an alternative proposal to name the taxon Enterobacter aerogenes Hormaeche and Edwards1960 [1].…”

“…revision of the Code in force at the time and all subsequent revisions [9][10][11] require that the epithet aerogenes be used (Rule 23a; 41a), and that the use of the epithet mobilis is illegitimate [Rule 51b (2)] and must be replaced by the oldest legitimate epithet (Rule 54). It should of course be remembered that at the time up to the inclusion of the names Enterobacter aerogenes Hormaeche and Edwards 1960 and Klebsiella mobilis Bascomb et al 1971 on the Approved Lists 1980 [7], the name 'Klebsiella aerogenes' (Kruse) Taylor et al 1956 was considered to be validly published and that the combination Klebsiella aerogenes (Hormaeche and Edwards 1960) could only have been created on or after the publication of the Approved Lists in 1980 [7].…”