The chromosome complement of two parthenogenetic Ostracodan species is described, that is Eucypris virens (Jurine) and Cypris bispinosa Lucas. The karyotype of E. virens (12 chromosomes in the somatic cells) consists of two metacentric chromosomes of very different length, one submetacentric, one subtelocentric and eight acrocentric. No chromosome pairs can be suggested according to the length and the centromeric position. The karyotype of C. bispinosa consists, in the somatic cells, of 22 chromosomes,...
The chromosome complement of an endemic species of Ephippigerid from Sicily, Uromenus riggioi, recently described by La Greca, is illustrated in the present paper. The karyotype (2 n = 23 in the male and 2 n = 24 in the female) consists of two large meta-centric pairs, nine acrocentric pairs showing a regularly decreasing length (the shorter fiveones are dot-shaped at metaphase) and two longer acrocentric X chromosomes. A single X chromosome is present in the male. These cytological findings reveal...
The reproduction biology of Italian populations of the Phasmid Clonopsis gallica was studied. The reproduction always occurs by thelytokous parthenogenesis. No males were observed in nature or in the laboratory strains. The chromosome number was established to be 54-57 in embryonic cells and egg follicle epithelium. The number most frequently observed was 56 of which 34 appear subtelocentric and 22 metacentric or submetacentric. The longest chromosome, unequal and subtelocentric, shows a secondary...
Vengono studiate le frequenze alleliche per il locus fosfoglucomutasi (PGM) in otto diverse popolazioni della zanzara Culex pipiens. Alcune delle popolazioni studiate sono tra loro geograficamente isolate, si sviluppano in ambienti ecologicamente molto diversi e presentano considerevoli fluttuazioni nelle dimensioni (originate anche da trattamenti con insetticidi). La notevole stabilità nelle frequenze alleliche nelle diverse popolazioni suggerisce che la selezione naturale sia il fattore principale...
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