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84 Terms used in Bionomenclature
genus or subgenus is based; see also generitype. (3) (zool., obsol.)
the type species of a genus; the genoholotype (q.v.). (4) (zool.,
obsol.) the type species of a section. (5) (zool., obsol.) any specimen
of the type species of a genus.
gens (palaeont., unoff.) proposed for a collection of palaeospecies (q.v.) in a
monophyletic succession.
genus, [gen.; pl. genera]: the principal category of taxa in the
nomenclatural hierarchy between family and species; the first part of
a binomen (q.v.) or binary name (q.v.) for a species.
genus group: (1) (bio.) the ranks of genus and subgenus. (2) (zool.) in the
hierarchy of classification the group of taxa between the family
group and the species group, including taxa at the ranks of genus
and subgenus; names of collective groups and ichnotaxa established
at the genus group level, are treated as genus group names.
genus group name: (zool.) a scientific name in the genus group (q.v.); see
also generic name, nominal genus.
genusbox: (palaeo., obsol.), see timeslot.
geotype: (zool., unoff,): a specimen from the type locality; a topotype
(q.v.).
giraultotype: (zool., unoff.) a type specimen that is represented by only the
distinguishng character of the species.
gluotype: ducotype (q.v.).
GMO: see genetically modified organism.
Gp: (cult. pl.) group (q.v.).
grade: (1) (not nomenclatural) the product and unit of anagenesis (i.e. all
types of biological improvement). (2) (not nomenclatural) a level of
morphological complexity, by which organisms can be grouped, but
generally polyphyletic and a result of convergent evolution; cfr
clade. (3) (zool., obsol.) a taxonomic rank or category of the
taxonomic hierarchy between subkingdom and phylum.
graded comparison: (palaeo.) a formally stated comparison of an
observation record with a base taxon.
graft: see graft-chimaera.