Exactly. A few more of the ones used by scientists are:
Brachygobius sp. = A species of
Brachigobius, but I didn't or couldn't find out which
Brachygobius sp. indet. = Literally, species indeterminate, i.e., the specimen as too damaged or too young to identify to species level
Brachgobius sp. aff.
xanthozona = From the Latin "affinis", meaning, a species of
Brachygobius related to
xanthozona, but distinct from it, so likely a different species
Brachgobius sp. cf.
xanthozona = From the Latin "confer", meaning a species of
Brachgobius comparable to, and probably identical with,
xanthozona, but I'm unable to confirm that
Note that all these words (sp., spp., cf., and aff.) are ALWAYS written in lower case and never italicized.
Cheers,
Neale
well, not necessarily all, just multiple species of that genus