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74 Terms used in Bionomenclature
ICTV for changes, and to publish regular reports on the current
taxonomy of viruses.
exemplar, [Ex.]: (unoff.) of a taxon, one selected to represent a taxon of
higher rank, e.g. species representative of a genus.
exerge: (zool., obsol.) a proposed term for a rank equivalent to that of
subspecies.
exfamiliaris: (zool., unoff.) used in a similar manner to familiaris (q.v.) to
indicate feral forms of domesticated animals; see praefamiliaris.
ex-holotype [ex holotypo]; see ex-type.
ex-isotype: [ex isotypo]; see ex-type.
exotypus: (zool., obsol.) proposed as an equivalent category to form (q.v.).
explicit exclusion: (1) in a Code, a statement as to an exception to the
application of that Code, or of particular provisions of that Code. (2)
of a specimen, scientific name or type, one stated as excluded from
the circumscription of a taxon by an author, e.g. by the use of "excl."
(q.v.) before the name or specimen.
explicit typification: (unoff.) an act of typification in which an author
designates the type; cfr implicit typification.
exsiccate: colloquial non-Latin usage for exsiccata (q.v.).
exsiccata [noun, pl. exsiccatae; adjective, exsiccatus, -um]: a set of dried
specimens, usually numbered and with printed labels, distributed by
sale, gift, or exchange; e.g. Fungi exsiccati: a set of dried fungi); an
exsiccate.
extant: (1) of a taxon, having one or more living representatives
(organisms) at the present time, or at some specified time since
humans began keeping written historical records. (2) of a specimen,
one still in existence.
external specifier: (phyl.) a species or specimen that is explicitly excluded
from the clade whose name is being defined; branch-based and
branch-modified node-based definitions have external specifiers, but
apomorphy-based, standard node-based, and apomorphy-modified
node-based definitions do not; see internal specifier.
extinct: of a taxon, one having no living representatives.