Chromosomes of a Freshwater Gastropod, Lymnaea luteola Lamarck(Lymnaeidae: Basommatophora).

Choudhury, Ramesh C.; Pandit, R. K.; Sahu, Trinath

doi:10.1508/cytologia.57.143

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Mitotic and meiotic chromosome preparations were made by the colchicineovotestis cell suspension-methanol acetic acid-flame drying-Giemsa technique described earlier (CHOUDHURY and MoHAPATRA 1991;CHOUDHURY et al 1992;CHoUD-HURY and PANDIT 1993). Camera lucida diagrams of 5 well spread mitotic metaphases of each species were drawn to the cosest accuracy for morphometric analysis of chromosomes.…”

Section: Methodsmentioning

confidence: 99%

Chromosomes of three prosobranch gastropods from Viviparidae, Pilidae and Cyclophoridae (Order: Mesogastropoda)

Choudhury¹,

Pandit²

1997

Caryologia

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Mitotic and meiotic chromosome preparations of Bellamya bengalensis f. doliaris (Viviparidae), Pi/a globosa (Pilidae) and Cyclophorus polynema (Cyclophoridae) were made by colchicine -ovotestis cell suspension -methanol acetic acid -flame drying -Giemsa technique. Karyotypes were prepared on the basis of decreasing length of the chromosomes and their morphometric analyses were done. The diploid number 2n = 22 with the chromosome formula n = 7m + 4 sm and FN = 44 forBellamya bengalensis f. doliaris, 2n = 28 with the chromosome formula n = 9m + 5sm and FN = 56 for Pi/a globosa and 2n = 28 with the chromosome formula n = 13m + 1sm and FN = 56 for Cyclophorus polynema were obtained. Chromosome numbers of each species was confirmed from the respective metaphase-! spreads and behaviour of their meiotic chromosomes were studied. The data obtained for each species were compared with the available chromosomal information on other confamilial species and the role of the possible mechanisms of karyotypic evolution in them have been discussed. Conservativeness with regard to chromosomal change at higher taxon levd has been discussed.

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Section: Methodsmentioning

confidence: 99%