Family names of authors are not abbreviated. They are followed by the year of valid publication. No punctuation is used:
Salmonella Lignieres 1900
Campylobacter upsaliensis Sandstedt and Ursing 1991
[and, not & or et]
Listeria marthii Graves et al 2010
[et al can be used if there are more than 2 authors, or list all authors]
Chlamydia psittaci (Lillie 1930) Page 1968
[Rickettsia psittaci Lillie 1930 was transferred to Chlamydia by Page in 1968; author of original name is retained in parentheses, and author of new name is added, including year.]
Salmonella enterica (ex Kauffmann and Edwards 1952) Le Minor and Popoff 1987
[Name was effectively published by Kauffmann and Edwards, but only validly published by Le Minor and Popoff; set ex in italic.]
