A
abdomen	the back end region of the insect body
ametabolous	little change of body form in growth development
antennae	one pair of segmented appendages located on the insect head
anterior	front
appendages	any organ, usually segmented, such as a leg or antenna connected to the external skeleton
arachnids	spiders and their near relatives such as mites, ticks and scorpions
arthropods	are animals that lack a backbone, and have an external skeleton, and jointed legs
C
caudal	meaning toward the hind end of the body
cercus	one pair of appendages at the hind end of the abdomen
chelicera(e)	the main pair of mouthparts of spiders and their relatives
compound eye	an eye made up of many individual elements
E
ecdysis	moulting
elytron	a thick, hard front wing
exoskeleton	a skeleton on the outside of the body
H
habitat	the living place of an animal or plant
head	the anterior body region
host	the organism in or on which an insect lives
I
imago	the adult stage of an insect
instar	the insect stage between moults
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L
larva	the immature stage between an egg and pupa of an insect
M
metamorphosis	a change of body form during development, between moults
moult	shedding of the exoskeleton
N
naiad	an aquatic gill-breathing nymph
nymph	an immature stage of an insect that does not have a pupa stage
O
orb web	a silk spider web of radiating and spiral strands
P
parasite	an animal that lives in or on the body of another living animal
pedipalps	the second pair of appendages of an arachnid
pollinate	the transfer of pollen from one flower to another
posterior	hind end, or back end
predator	an animal that attacks and feeds on other animals
pupa	the stage of development between the larva and the adult in insects with complete metamorphosis
S
scavenger	an animal that feeds on dead plants or animals
T
tenaculum	in collembolans a structure under the abdomen in which the furcula is held
thorax	the body region behind the insect head, which bears the wings and legs
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