New developments in vertebrate cytotaxonomy I. cytotaxonomy of the amphibians

Morescalchi, A.

doi:10.1007/bf00122043

Cited by 20 publications

(7 citation statements)

References 70 publications

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“…Karyotypes of more than 300 studied species of the genera Rana Linnaeus, 1758 and Pelophylax Fitzinger 1883 are characterized by a standard chromosome number of 2n=26 (sometimes 22 or 24) including metacentric, submetacentric and subtelocentric chromosomes (Morescalchi, 1973(Morescalchi, , 1977Ivanov, Madjanov, 1973;Schmid, 1978;Schmid et al, 1990;Orlova et al, 1978;Birstein, 1984;King, 1990;Kuramoto, 1990;Green, Borkin, 1993;Miura, 1995;Alpagut, Falakali, 1995;Spasič-Bošković, 1999;Al-Shehri, Al-Salech, 2005;Suryadnaya, 2003;Kaibeleva et al, 2004;Joshy et al, 2006;Mindrescui, Ghiorghyk, 2008).…”

Section: Discussionmentioning

confidence: 99%

Features of the karyotypes of Pelophylax ridibundus Pallas, 1771 and Rana macrocnemis Boulenger, 1885 (Amphibia: Ranidae) from Armenia

Martirosyan¹,

Stepanyan²

2009

CCG

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Abstract. Сhromosomal complements of Pelophylax ridibundus Pallas, 1771 from 9 localities (Northern, Central and South Armenia) and Rana macrocnemis Boulenger, 1885 from one locality (North-West Armenia) have been analyzed. The chromosome sets of P. ridibundus collected from 8 localities showed 2n=26, (10m+12sm+4st; NF=52). A secondary constriction has been observed in all studied individuals on the 10-th chromosome pair showing NOR-positive reaction. C-positive heterochromatin blocks have been observed on long arms of the 2-nd and 10-th pairs of chromosomes (7 localities). In addition, C-heterochromatin blocks have been found on interstitial regions of short arms of the 12-th pairs, as well as in telomeric regions of long arms of the 9-th pairs and on short arms of the 5-th pair in the frogs from 2 localities. The karyotype of P. ridibundus from populations near Ejmiatsin differs from other populations (2n=26, 12m+10sm+4st). Diploid number of chromosomes of R. macrocnemis was also 26 (8m+12sm+6st, NF=52). Blocks of C-positive heterochromatin have been revealed in telomeric parts of the 1-st, 2-nd (p), 3-rd (q), 4-th (q), 6-th, 9-th (p), 10-th (p,q) and 13-th (q) pairs, as well as in interstitial regions of the 1-st and 2-nd pairs of chromosomes. Intrapopulation and interpopulation geographic variations of karyotypes and C-heterochromatin banding patterns of P. ridibundus have been revealed. Karyotypically, morphotypes "macrocnemis" and "camerani" are closely related.

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Section: Discussionmentioning

confidence: 99%

Features of the karyotypes of Pelophylax ridibundus Pallas, 1771 and Rana macrocnemis Boulenger, 1885 (Amphibia: Ranidae) from Armenia

Martirosyan¹,

Stepanyan²

2009

CCG

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“…Microchromosomes are absent except for possibly the smallest chromosome pair in Necturus (Morescalchi 1979, Sessions 1980, Sessions & Wiley 1985.…”

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confidence: 98%

Evolutionary cytogenetics in salamanders

Sessions

2008

Chromosome Res

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Salamanders (Amphibia: Caudata/Urodela) have been the subject of numerous cytogenetic studies, and data on karyotypes and genome sizes are available for most groups. Salamanders show a more-or-less distinct dichotomy between families with large chromosome numbers and interspecific variation in chromosome number, relative size, and shape (i.e. position of the centromere), and those that exhibit very little variation in these karyological features. This dichotomy is the basis of a major model of karyotype evolution in salamanders involving a kind of 'karyotypic orthoselection'. Salamanders are also characterized by extremely large genomes (in terms of absolute mass of nuclear DNA) and extensive variation in genome size (and overall size of the chromosomes), which transcends variation in chromosome number and shape. The biological significance and evolution of chromosome number and shape within the karyotype is not yet understood, but genome size variation has been found to have strong phenotypic, biogeographic, and phylogenetic correlates that reveal information about the biological significance of this cytogenetic variable. Urodeles also present the advantage of only 10 families and less than 600 species, which facilitates the analysis of patterns within the entire order. The purpose of this review is to present a summary of what is currently known about overall patterns of variation in karyology and genome size in salamanders. These patterns are discussed within an evolutionary context.

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“…Menzies and Tippett (1976), examining 22 Litoria and six Nyctimystes species of Papua New Guinea, reported that the chromosome number of Papuan hylids (including L. angiana) is 2n=26, with the exception of L. infrafrenata with 2n =24 chromosomes. Karyological studies on the Australian species including the genus Cyclorana (King, 1980;King et al, 1979;Morescalchi, 1979;Morescalchi and Ingram, 1974;Stephenson and Stephenson, 1970) confirmed that the basic diploid number of the pelodryadine frogs is 26.…”

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confidence: 88%

Karyotypes of Five Hylid Frogs from Papua New Guinea, with a Discussion on Their Systematic Implications

Kuramoto

Allison

1991

Jpn.J.Herpetol.

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The karyotypes of three species of the genus Litoria and two of the genus Nyctimystes (Hylidae: Pelodryadinae) from Papua New Guinea are reported. They have 2n=26 chromosomes which can not be divided into distinct size groups. In Litoria species, five or six pairs among pair Nos. 2-8 are submetacentric or subtelocentric and the others metacentric. The karyotype of Nyctimystes differs from that of Litoria in having a longer No. 1 and metacentric No. 2. Karyological comparisons with related taxa suggest that the Pelodryadinae is most closely related to the Phyllomedusinae, and that the primitive leptodactylids, rather than the Australian myobatrachids, are likely to be the ancestral stock of the Pelodryadinae. Nyctimystes seems to have been derived from a group of Litoria.

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New developments in vertebrate cytotaxonomy I. cytotaxonomy of the amphibians

Cited by 20 publications

References 70 publications

Features of the karyotypes of Pelophylax ridibundus Pallas, 1771 and Rana macrocnemis Boulenger, 1885 (Amphibia: Ranidae) from Armenia

Features of the karyotypes of Pelophylax ridibundus Pallas, 1771 and Rana macrocnemis Boulenger, 1885 (Amphibia: Ranidae) from Armenia

Evolutionary cytogenetics in salamanders

Karyotypes of Five Hylid Frogs from Papua New Guinea, with a Discussion on Their Systematic Implications

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