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Class 1 - C lass 1 E ntomology t he study of insects I...

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Class 1 Entomology the study of insects Insect : Ectognathous( exposed mouth parts), organ systems Ectoparasite a parasite that lives externally on and at the expense of another organism, which it does no kill Endoparasite a parasite that lives internally at the expense of another organism, which it kills Discontinous growth insect growth is discontinuous, at least for sclerotized cuticular parts of the body. Instar(molt increment) increment in size, first component of growth, growth stage or the form of the insect between two successive molts Stadium(intermolt period) second component of growth, the time between two successive ecdyses Indeterminante growth the animals continue to molt until they die- collembolans, diplurans, and apterygote insects. Determinate growth vast majority of insects undergo determinate growth, there is a distinctive instar that marks the cessation of growth and molting. Become reproductively mature in this final instar, called the adult of imaginal instar. Ontogeny the process of development from egg to adult Ametaboulous Lacking metamorphosis, develop to adulthood with little change in body form, except for sexual maturation through development of gonads and genitalia. ex. apterygotes and non-insect hexapods Metamorphosis relatively abrupt change in body form between the end of immature development and the onset of the imaginal (adult) phase Incomplete( hemimetabolous) metamorphosis development in which the body form gradually changes at each molt, with wing buds growing large at each molt. Immature stages of hemimetabolous insects are nymphs. ex.cockroaches, grasshoppers, mantids and bugs
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Complete (holometabolous) metamorphosis development in which the body form abruptly changes at the pupal molt. Immature stages of holometabolous insects are larvae. Embryonic phase egg stage begins as soon as the female deposits the mature egg. chorion the outermost shell of an insect egg, which may be multilayered, including the exochorion, endochorion, and wax layer micropyle a minute opening in the chorion of an insect egg through which sperm enter Energids in an embryo, the daughter nuclei cleavage products and their surrounding cytoplasm Blastoderm the infolding of the membrane leading to cellularization of the superficial layer to form the blastoderm. Gastrule Larval phase Hatching from the egg may be by a pronymph, nymph, or larva makrs the beginning of the first stadium, said to be in its first instar. Endopterygote larvae can be classified into a few functional types. Polypod cylindrical bodies with short thoracic legs and abdominal prolegs, rather inactive and are mostly phytophagous. Ex. Lepidopteran caterpillars Oligopod Lack abdominal prolegs but have functional thoracic legs and frequently prognathous mouthparts, many are active predators but others are slow, moving detritivores living in soil or are phytophages. This type occurs in at least some members of most orders.
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