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Int J Syst Evol Microbiol 55 (2005), 2317-2322; DOI  10.1099/ijs.0.63555-0
© 2005 International Union of Microbiological Societies

Spiroplasma penaei sp. nov., associated with mortalities in Penaeus vannamei, Pacific white shrimp

Linda M. Nunan1, Donald V. Lightner1, Marietta A. Oduori2 and Gail E. Gasparich2

1 Department of Veterinary Sciences and Microbiology, University of Arizona, Tucson, AZ 85721, USA
2 Department of Biological Sciences, Towson University, Towson, MD 21252, USA

Correspondence
Linda M. Nunan
lmn{at}u.arizona.edu

A new bacterial strain, designated SHRIMPT, isolated from the haemolymph of the Pacific white shrimp, Penaeus vannamei, was serologically distinct from other spiroplasmas. Cells of this strain were helical in form and variable in length. Examination by electron microscopy revealed wall-less cells delineated by a single cytoplasmic membrane. The organisms grew well in M1D media supplemented with 2 % NaCl. Strain SHRIMPT grew at temperatures of 20–37 °C, with optimum growth occurring at 28 °C. The strain catabolized glucose and hydrolysed arginine, but did not hydrolyse urea. The G+C content of the DNA was 29±1 mol%. Strain SHRIMPT (=ATCC BAA-1082T=CAIM 1252T) is designated the type strain of a novel species, Spiroplasma penaei sp. nov., which represents a new subgroup (I-9) of the group I spiroplasmas.

Abbreviations: SPF, specific pathogen-free; TEM, transmission electron microscopy

Published online ahead of print on 1 July 2005 as DOI 10.1099/ijs.0.63555-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain SHRIMPT is AY771927.






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