Abiotrophia is a genus of lactic acid bacteria, a family in the phylum Firmicutes (Bacteria).
The genus contains 4 species of coccus shaped species, 2 are former members of the genus Streptococcus, which were transferred in 1995 to the newly coined genus Abiotrophia:
A. adiacens ( (Bouvet et al. 1989) Kawamura et al. 1995; Latin feminine gender adjective adiacens, adjacent, indicating that this organism can grow as satellite colonies adjacent to other bacterial growth.)
A. defectiva ( (Bouvet et al. 1989) Kawamura et al. 1995, comb. nov. (Type species of the genus).; Latin feminine gender adjective defectiva, deficient.)
Other 2 are latter additions:
In 2000, Collins and Lawsons further differentiated A. adiacens, A. balaenopterae and A. elegans from A. defectiva by placing them into the new genus Granulicatella.
The name Abiotrophia derives from: Greek prefix ἄ (a)-, negative (un-); Greek noun βιος (bios), life; Greek noun τροφιά (trophia), nutrition; New Latin feminine gender noun Abiotrophia, life-nutrition-deficiency.
For the Human Microbiome Project (HMP), the genome of Abiotrophia defectiva ATCC 49176 has been sequenced (assembly) as it is a resident of human oral cavity and urogenital and intestinal tracts and is a cause of infective endocarditis, showing it to have 3291 protein encoded in a 3.4774 Mbp genome with a GC content of 37.0% 
Formerly classified as nutritionally variant streptococci, A. elegans had been identified as a cause of 1 to 2% of blood culture negative bacterial endocarditis.
^ a b "KAWAMURA (Y.), HOU (X.G.), SULTANA (F.), LIU (S.), YAMAMOTO (H.) and EZAKI (T.): Transfer of Streptococcus adjacens and Streptococcus defectivus to Abiotrophia gen. nov. as Abiotrophia adiacens comb. nov. and Abiotrophia defectiva comb. nov., respectively. Int. J. Syst. Bacteriol., 1995, 45, 798-803". Archived from the original on 2010-07-17. Retrieved 2011-05-22.
^ a b Abiotrophia entry in LPSN; Euzéby, J.P. (1997). "List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet". International Journal of Systematic and Evolutionary Microbiology. 47 (2): 590–2. doi:10.1099/00207713-47-2-590. PMID 9103655.
^ KAWAMURA (Y.), HOU (X.G.), SULTANA (F.), LIU (S.), YAMAMOTO (H.) and EZAKI (T.): Transfer of Streptococcus adiacens and Streptococcus defectivus to Abiotrophia genitive case nov. as Abiotrophia adiacens comb. nov. and Abiotrophia defectiva comb. nov., respectively. Int. J. Syst. Bacteriol., 1995, 45, 798-803.
^ "Abiotrophia balaenopterae sp. nov., isolated from the minke whale (Balaenoptera acutorostrata)". Archived from the original on 2010-07-17. Retrieved 2011-05-22.
^ "Archived copy". Archived from the original on 2011-03-07. Retrieved 2011-05-22.CS1 maint: archived copy as title (link)
^ Christensen, J. J.; Facklam, R. R. (1 October 2001). "Granulicatella and Abiotrophia Species from Human Clinical Specimens". Journal of Clinical Microbiology. 39 (10): 3520–3523. doi:10.1128/JCM.39.10.3520-3523.2001.
^ Collins M, Lawson P. Int J Syst Evol Microbiol 50(1):365-369 doi:10.1099/00207713-50-1-365
^ "Abiotrophia defectiva ATCC 49176 (ID 33011) - BioProject - NCBI".
^ Sharaf MA, Shaikh N. (Dec 2005). "Abiotrophia endocarditis: case report and review of the literature". Can J Cardiol. 21 (14): 1309–11. PMID 16341303.