Topic
Cepaea sylvatica
About: Cepaea sylvatica is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 14 citations.
Papers
TL;DR: The karyotypes of Cepaea nemoralis and C. hortensis (Muller), with 2n =44 and a conspicuously large pair of chromosomes, are described and compared with that of C. sylvatica (Draparnaud) which has 2n=50.
Abstract: The karyotypes of Cepaea nemoralis (L.) and C. hortensis (Muller), with 2n=44 and a conspicuously large pair of chromosomes, are described and compared with that of C. sylvatica (Draparnaud) which has 2n=50. The karyotype of C. sylvatica also has a conspicuously large pair of chromosomes but the comparison suggests that these have an independent origin from those in the 2n = 44 species. There is no evidence that the large chromosomes in C. nemoralis and C. hortensis have originated from simple fusion of chromosomes from a 2n=50 karyotype with chromosomes all sub-equal such as is reported for C. vindobonensis. It may be that such a karyotype with little size differentiation amongst the chromosomes is not a primitive feature in the Helicinae. The relationship of shell colour and banding polymorphism to the chromosome architecture is discussed.
11 citations
TL;DR: The karyotype of Cepaea vindobonensis (Pfeiffer) (2n= 50) is defined and compared with those of C. sylvatica (Draparnaud), C. nemoralis (L.) and C. hortensis (Muller).
Abstract: The karyotype of Cepaea vindobonensis (Pfeiffer) (2n= 50) is defined and compared with those of C. sylvatica (Draparnaud), C. nemoralis (L.) and C. hortensis (Muller). Cepaea vindobonesis shares its chromosome number with C. sylvatica. The genus Cepaea thus consists of two pairs of species, one with 2n= 50 the other with 2n= 44. The karyotype of C. vindobonensis is distinct from that of C. sylvatica as it lacks any discontinuity in its range of chromosome length and has all three of its longest chromosome pairs nearly identical. The two 2n= 50 species both have an unusual meiotic bivalent showing a ‘satellite-type’ structure. It is apparent that the 2n= 50 species are more closely related to each other than to the 2n= 44 species. No precise definition of the evolutionary history can be given but a working hypothesis is suggested.
5 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 1986 | 1 |
| 1980 | 1 |