Nana Bakhtadze
Ilia State University, Institute of Zoology, Department Member
Chromosome number data on the Hygromiidae (Gastropoda: Stylommatophora) are summarized and reviewed briefly in the context of the phylogeny of the family. In hygromiids, the haploid chromosome numbers range from 21 to 26. It is supposed... more
Chromosome number data on the Hygromiidae (Gastropoda: Stylommatophora) are summarized and reviewed briefly in the context of the phylogeny of the family. In hygromiids, the haploid chromosome numbers range from 21 to 26. It is supposed that n = 21 is the ancestral chromosome number in the family. The modal haploid number for Hygromiidae is 23. Description of karyotype in terms of chromosome number and morphology of hygromiid land snail Circassina frutis is provided for the first time. The diploid chromosome number of this species is 2n = 46. The karyotype is symmetric and consists of 21 pairs of metacentric and 2 pairs of submetacentric chromosomes. The karyotype formula is as follows: 2n = 42m + 4sm (n = 21m + 2sm). The fundamental number (FN) is 92. Chromosomes range in length from 2.53 μm for the smallest pair to 6.00 μm for the largest pair. The total length of chromosomes in diploid complement (TCL) is 170.40 ± 3.22 μm.
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The results of the karyological investigations of the terrestrial mollusks of Georgia (Caucasus region) are given. The samples from western Georgia (Imereti and Samegrelo-Zemo Svaneti regions) were used. The basic chromosome numbers of... more
The results of the karyological investigations of the terrestrial mollusks of Georgia (Caucasus region) are given. The samples from western Georgia (Imereti and Samegrelo-Zemo Svaneti regions) were used. The basic chromosome numbers of four species belonging to families: Clausiliidae, Hygromiidae, Oleacinidae and Pomatiidae were established. In clausiliid species Elia (Megaleuxina) derasa basic chromosome number n=27 was registered, for hygromiid snail Fruticocampylaea narzanensis n=23, n=26 was recorded in oleacinid Poiretia mingrelica and n=13 in pomatiid species Pomatias rivularis. The chromosome numbers registered in the investigated species of Georgian land snails: E. derasa, F. narzanensis, P. mingrelica and P. rivularis are within the ranges of chromosome numbers described for families Clausiliidae, Hygromiidae, Oleacinidae and Pomatiidae, respectively. n=27 is the new chromosome number in the family Clausiliidae. The numbers n=23, n=26, n=27 are basic chromosome numbers characteristic of Caucasian and Georgian terrestrial mollusks.