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Entomology Exam 2

TermDefinition
Molting the periodic formation of new cuticle of greater surface area and the shedding of the old cuticle
Ecydysis the process of casting off the old cuticle during molting
Eclosion the emergence of an adult inset from its pupal case, or the hatching of an insect from an egg
Instar the growth stage, or form of the insect between two successive molts
Metamorphosis the relatively abrupt change in body form and physiology between the immature and adult stages
Amemtabolous no metamorphosis; immatures differ from adults only in size and reproductive maturity; most species have indeterminante growth
Hemimetabolous incomplete metamorphosis; immatures called nymphs; changes gradually through instars; determinate growth; wings develop externally
Holometabolous complete metamorphosis; immatures called larva; wings develop internally; determinate growth
Polypod larva cylindrical body with short thoracic legs and abdominal prolegs
Oligopod larva thoracic legs only
Apod larva lack true legs, worm-like
Pupation the molt into the pupa instar (becoming a pupa)
Exarate pupa appendages not closely appressed to body
Obtect pupa appendages are appressed to body; cuticle often heavily sclerotized
Voltinism univoltine bivoltine multivoltine -the number of generations per year -1 generation per year -2 generations per year -3 or more generations per year
Factors for species richness? small size, metamophosis, wing development modified appendages, short generation time & high genetic heterogeneity,sensory sophistication, behavior, coevolution with plants
sensillum a sensory organ that protrudes from the cuticle, or sometimes lie within or beneath it
Exteroceptors sensilla that detect environmental stimuli
Proprioceptors self-perception sensilla (positive receptors)
Trichoid sensilla hair-like sensilla; respond to tactile stimuli; found on MP, antennae, legs, ovipositor; form hair plates
Campaniform sensilla detects stress on cuticle; consists of central cap or peg surrounded by raised cuticle; located on leg and wing joints, ovipositor, areas liable to distortion
Chordotonal sensilla percieves airborne and substrate vibrations; subcuticular
Johnston's Organ found in pedicel of antenna; senses movement of antennal flagellum
Tympanic Organs thin area of cuticle; senses airborne vibrations
Subgenual Organs located in proximal tibia of each leg; sensitive to vibrations of substratum
chemosensilla sensilla that detect chemicals
Multiporous sensilla sensilla that detect airborne chemicals; found on antennae and MP
Uniporous sensilla sensilla that detects aqueous chemicals; found on tarsi, MP, ovipositor
Photosensilla sensilla that detect light
Compound eyes aggregation of units called ommatidia; poor resolution
Ocelli detects light intensity; aids in flight
Stemmata senstive to polarized light; some image detection and distance perception
Dermal detection other cells sensitive to light
Created by: aly486
 

 



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