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60 Terms used in Bionomenclature
on 1 January 1758, whether or not it was actually published on that
date).
definite inclusion: (1) (bot.), of the type of a name, the direct or indirect
reference to the type of a previously or simultaneously published
name, whether accepted or synonymized by the author, by citation
of the nomenclatural type of a name or the name itself. (2) (bot.) of a
name, any element directly or indirectly included when the name
was introduced and to be taken into account in its typification; see
also protologue.
definition: (1) (zool.) a statement in words that purports to give those
characters which, in combination, uniquely distinguish a taxon from
others; a diagnosis (q.v.). (2) (phyl.) a statement specifying the
meaning of a name (i.e. the taxon to which it refers). (3) (obsol.) a
differentia (q.v.).
definitional author: (phyl.) the person(s) who published a phylogenetic
definition for a name, either the original definition or an emended
one; see nominal author.
deme, [-deme]: (1) (not nomenclatural, obsol.) a system of special-purpose
category terms denoting a group of individuals of a taxon and
formed by adding the suffix "-deme" to a stem, e.g. topodeme (a
group growing in one place). (2) (not nomenclatural) small units of
population that are evolutionarily significant that are in close contact
with each other.
denomination class: (cult. pl.) the taxonomic unit in which cultivar and
Group epithets may not be duplicated except in special
circumstances; see also varietal denomination.
depreciated name: (prok.) one included in the Approved List or validly
published after 1 January 1980 but currently treated as a synonym of
an accepted name.
derived variety: (cult. pl.) a cultivar that is derived from an openpollinated
cultivar and which is not considered to be sufficiently
distinct from that cultivar to meet the criteria of a DUS test (q.v.).
dermestotype: (zool., unoff.) a specimen of a type-series so badly eaten by
dermestids that its identity cannot be confirmed (!); see also
psocotype.