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PPSE FINAL
Terms Part 5
50
Other
Undergraduate 1
03/13/2011

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Term
Phytophagous
Definition
feeding on plants.
Term
Pigment cell
Definition
in the insect eye, the cells which surround each ommatidium and protect it from scattered light.
Term
Placenta
Definition
an organ which attaches to the uterus, and in which the embryo develops
Term
Pneumonic
Definition
having to do with the lungs.
Term
Predator
Definition
an organism which attacks, kills and devours its prey.
Term
Prey
Definition
an organism which is fed upon by a predator.
Term
Primary producer
Definition
see autotroph
Term
Proboscis
Definition
see rostrum.
Term
Prolegs
Definition
in Lepidoptera, outcroppings of the exoskeleton along the abdomen that help the caterpillar grasp onto plant surfaces. Not true legs.
Term
Pronation
Definition
movement toward the midline of the body.
Term
Proteolytic
Definition
the process of breaking down proteins into amino acids.
Term
Proventriculus
Definition
a musculated part of the digestive system which is responsible for chewing and grinding food.
Term
Psyche
Definition
in Greek mythology, a beautiful mortal woman who attained the state of a goddess and whose symbol is the butterfly.
Term
Punctuated equilibria
Definition
referring to the irregular rate of evolutionary change, with long periods of slow change, interrupted by bursts of rapid speciation.
Term
Pupa
Definition
the transformation stage of the holometabolous orders, in between larva and adult.
Term
Pupil
Definition
in the human eye, the aperture that regulates the amount of light by opening and closing.
Term
Pyrethroid
Definition
a class of insecticides which interfere with the nerve impulse across the axon.
Term
Reason for success
Definition
the basis for how well an organismal group is performing on Earth.
Term
Recessive
Definition
referring to an allele which cannot be expressed in the presence of a dominant allele.
Term
Rectum
Definition
posterior part of the excretory system, which eliminates waste from the insect's body.
Term
Resistance
Definition
In an insect or mite population, the increase in frequency of alleles which can detoxify an insecticide or miticide.
Term
Retina
Definition
in the human eye, the membrane at the back of the eye imbedded with light sensitive cells.
Term
Retinula cell
Definition
in the insect, the light receptive cell within an ommatidium.
Term
Rostrum
Definition
the snout-like arrangement of the mouthparts in some insects such as the Hemiptera or mosquitoes. See proboscis.
Term
Salivary channel
Definition
a groove formed by the mandibles and maxillae through which saliva is injected into the host.
Term
Salivary glands
Definition
in insects or humans, organs that secret initial digestive enzymes.
Term
Scientific binomen
Definition
the two part Latin name of a species.
Term
Scientific method
Definition
a process to answer a question, involving an experiment.
Term
Sclerotized
Definition
hardened.
Term
Semi-social
Definition
In some Hymenoptera, a life cycle in which the mated queen is the only member of the colony which overwinters.
Term
Sensilla (sensory appendage)
Definition
a sense organ which consists of cuticle.
Term
Septicemia
Definition
the presence of bacteria in the blood.
Term
Sexual selection
Definition
female selection of a mate based on physical characteristics or ability. This leads to differences in characteristics between males and females. Also known as female choice.
Term
Siphoning
Definition
referring to the lepidopteran mouthparts, consisting of paired coiled tubes which are inserted into flowers to feed on nectar.
Term
Solitary
Definition
living alone. Solitary organisms meet with members of their own species solely for purposes of mating.
Term
Somatic cells
Definition
cells of a body which are not involved in reproduction.
Term
Species
Definition
groups of organisms that are reproductively isolated from other such groups. Species is singular and plural, and "spp." is the abbreviation for species plural.
Term
Spermatheca
Definition
part of the insect female reproductive system, an organ which stores sperm.
Term
Spermatophore
Definition
a gelatinous substance produced by the male accessory gland in insects, which protects the sperm during copulation.
Term
Spinneret
Definition
an appendage on the posterior end of spiders, from which silk is spun. Spiders have from four to eight.
Term
Spinosad
Definition
a chemical derived from the bacterium Saccharopolyspora spinosa, and used as an insecticide.
Term
Spiracle
Definition
an opening in the insect's integument that allows for gas exchange between the insect’s body and its surrounding environment.
Term
Spirochete
Definition
a single celled microorganism which has properties of both bacteria and viruses.
Term
Spontaneous generation
Definition
the belief that organisms arise from dead, decaying or waste matter.
Term
Stridulate
Definition
the process of making a noise by rubbing two rough surfaces together. Many Orthoptera stridulate by rubbing two legs or a leg and a wing together.
Term
Stylet
Definition
the needle-like modification of the mandibles and maxillae, used for piercing and sucking in insects such as the Hemiptera and mosquitoes.
Term
Supination
Definition
Movement toward the outside of the body.
Term
Surface area to volume ratio
Definition
the two dimensional measure on an insect relative to the three dimensional measure within.
Term
Surface tension
Definition
the cohesive forces between molecules that allow a liquid to resist an external force.
Term
Symbiotic
Definition
"living together." A symbiotic relationship involves two species, which may be mutually beneficial, positive to one and negative to the other, or positive to one and neutral to the other.
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