Agriculture Reference
In-Depth Information
Glossary
Abdomen
The third of the three main divisions of
the body of an insect.
Aculeate
Pointed; also, a member of the order Hy-
menoptera which possesses a sting.
Aestivation
Summer diapause.
Alate
(pi.
alatae, alates)
A winged insect - applied
usually to an aphid.
Ambulacrum
The terminal part of the leg of a
mite in regular contact with the substratum,
consisting mainly of the apotele (q.v.) but
also sometimes a pretarsus (q.v.) and a pulvillus
(q.v.).
Amphitoky
Parthenogenetic reproduction in which
both male and female offspring are produced
from unfertilized eggs.
Anal claspers
The pair of prolegs on the last abdomi-
nal segment of an insect larva.
Anal plate
A dorsal plate often present on the last
abdominal segment of an insect larva.
Anchor process
(see
Sternal spatula).
Anholocyclic
As in aphids, breeding partheno-
genetically and viviparously.
Annulate
With ring-like markings.
Annulus
(pi.
annuli)
A small ring.
Antenna
(pi.
antennae)
One of the pair of sensory
'feelers' on the head of an insect.
Antennomeres
The individual components ('seg-
ments') of an insect antenna.
Anterior
At or towards the front.
Apical
At or towards the tip (apex) of a structure,
e.g. that part furthest from the body.
Apodous
Without legs, legless.
Apotele
The articulating sixth segment arising from
the tarsal segment of the pedipalp of certain
mites.
Appendage
An outgrowth, such as a leg or wing,
attached to the body by a joint.
Aptera
(pi.
apterae)
A wingless insect - applied usu-
ally to an aphid.
Apterous
Without wings, wingless.
Arboviral disease
A disease caused by an arbovirus
(q.v.).
Arbovirus
A virus spread by an arthropod vector
('arbo' standing for arthropod-borne).
Arista
A bristle-like outgrowth, as on the antennae
of certain insects.
Aristate
Bearing an arista.
Arolium
(pi.
arolia)
A usually very small pad or sac-
like structure located between the claws of the
foot of an insect.
Arrhenotoky
Parthenogenetic reproduction in
which only male offspring are produced from
unfertilized eggs.
Atraceate
Lacking spiracles and a tracheal system.
Basal
At or towards the base of a structure, e.g. that
part nearest the body.
Basitarsus
The basal (and often the largest) segment
of the tarsus.
Bidentate
With two teeth.
Biordinal
Of two sizes.
Bipectinate
Feather-like (cf. Pectinate).
Birefringent
Showing
characters
of
double
refraction.
Bivoltine
Having two generations annually.
Brachypterous
Having shortened wings.
Breast bone
(see
Sternal spatula).
Calypter
(see
Squama).
Campodeiform larva
An elongate, dorsoventrally
flattened larva with well-developed antennae and
thoracic legs, as in larvae of many lacewings and
beetles.
Capitate
With a distinct head.
Caste
One of several distinct forms found amongst
populations of social insects.
Caterpillar
An eruciform larva of a butterfly, moth
or sawfly.
Cauda
A tail, including the tail-like structure of an
aphid.
Caudal
At or towards the tail (anal) end.
Cell
As in insect wing venation, a discrete area
enclosed by veins.
Cement glands
(see
Colleterial glands).
Cenchri
Wing-coupling tubercules found in certain
sawflies.
