Results 261 to 270 of about 35,644 (272)
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NOTES ON UTAH LACHNEA (APHIDIDAE)
The Canadian Entomologist, 1930The hypothetical ancestor of the Aphididae was probably a large generalized form, always winged, both sexes occurring in each generation, and with only a few generations each year. Migration would be lacking, and the development of the aphid ancestor would probably be tied up with one of the primitive types of plants occurring in that early period.
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The evolutional significance of the chromosomes of Aphididae
Journal of Morphology, 1931AbstractAn investigation into the number of chromosomes in thirty‐seven species of Aphidiae belonging to twenty‐seven geaera has shown that there is but one sex chromosome in the male cells of all but one species of Aphididae. That exceptional species is Euceraphis betulae Koch.The number of chromosomes and body characters are so closely correlated ...
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The Aphididae of the Canadian Arctic (Homoptera)
The Canadian Entomologist, 1963AbstractEighteen species are listed of which eight are described as new. Most of these species were collected in the more southerly parts of the Canadian Arctic, but two species were collected at Lake Hazen which is situated in the extreme northeastern portion of Ellesmere Island.
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The Myzaphidines of Canada (Homoptera: Aphididae)
The Canadian Entomologist, 1963AbstractThe myzaphidines in Canada consist of three genera and seven species of which two are described as new. Myzaphis v. d. G. is recorded from North America apparently for the first time and one endemic species is described. Keys and brief descriptions of the genera and viviparous forms are offered.
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Chromosome numbers in the Aphididae and their taxonomic significance
Systematic Entomology, 1980Abstract. Diploid female chromosome numbers are listed for 180 aphid species not previously karyotyped. The list includes the first chromosome records for several aphid tribes (Tramini, Greenideini, Anomalaphidini, Nippon‐aphidini). Variation in chromosome number at different systematic levels is discussed. Usually the karyotype is particularly stable
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Dynamics of Aphididae Populations on Hardangervidda
1975The aphids collected with the quick trap method (Kauri et al, 1969; Solhoy, 1972) at the Stigstuv IBP alpine tundra dry and wet meadow sites described by Sonesson et al. (1975) comprise 8 species. The population of the wet meadow is sparse, and only material from the dry meadow is considered in the ecological discussion.
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Die Farbstoffe der Blattläuse(Aphididae)
Experientia, 1962Many dark-coloured species ofAphididae contain a colouring matter (protoaphin) of unusual structure in the haemolymph. After death of the insect this undergoes a remarkable series of changes by enzymic action yielding successively the pigments xanthoaphin, chrysoaphin and erythroaphin.
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Läusestammkulturen an Potentilla anserina (Homoptera: Aphididae).
1957Beiträge zur Entomologie = Contributions to Entomology, Bd. 7 Nr. 3-4 (1957)
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