Access Resource - Global Biodiversity Information Facility

141 The naming of organisms (and plant communities)
onomatotype: see onomatype.
onomatype, [onomatotype]: (obsol.) a specimen which has been cited in
print but which does not add anything not previously known about
the morphology of the species or subspecies to which it is referred;
an unessential type (q.v.).
ootype: (1) (zool., unoff.) the type of an egg; an ovotype (q.v.). (2) (not
nomenclatural) a genital organ in certain tapeworms.
op. cit.: opere citato (q.v.).
opera utique oppressa: see suppressed works.
operational taxonomic unit, [OTU]: the lowest taxon being studied in a
particular investigation; i.e. an assemblage of individual collections,
isolates or taxa of any rank used in scoring data for subsequent
analysis, usually by phenetics methods.
opere citato, [op. cit.]: in the work cited (but not the page); used to avoid
the need to repeat a bibliographic reference cited earlier in the same
publication; see also loco citato.
-ophytanae: (bot., unoff.) suffix proposed for names in the rank of
superdivision or superphylum; see also –mycotera.
Opinion: (1) (zool.) a formal publication by the Commission (ICZN)
containing a ruling that applies, interprets, or suspends provisions of
the Code in a case affecting one or more stated names,
nomenclatural acts or works; an Opinion states how the Code is to
be applied or interpreted, or the course to be followed in aparticular
case. (2) (prok.) a decision of the Judicial Commission of the
International Committee on Prokaryote Systematics (ICPS).
-opsida: (bot.) suffix used to denote a name in the rank of class, except in
algae and fungi.
-ordanoj: (unoff.) proposed termination in Esperanto for a name in the rank
of order in the New Biological Nomenclature (q.v.).
order, [ordo]: (1) (bot., prok., zool.) the principal category of taxa
intermediate in rank between class and family; indicated by the
suffix -ales (prok., bot.); see also ordo naturalis. (2) (phyt.) one of
the four principle ranks in the hierarchical system of syntaxa,
between that of alliance and class.