Karyotypic Studies on Cyclorana and Associated Genera of Australian Frogs.

King, M; Tyler, MJ; Davies, Margaret; King, D.

doi:10.1071/zo9790699

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…In agreement with earlier investigations (Morescalchi and Ingram, 1974;King et al, 1979;Mahony and Robinson, 1986), both species have a diploid chromosome number of 2n = 24. All chromosomes are biarmed and can be arranged in 12 pairs (Fig.…”

Section: Constitutive Heterochromatin and Nucleolus Organizer Regionssupporting

confidence: 79%

“…A small number of studies on the chromosomes of the genus Mixophyes have been performed using conventional staining and silver labeling of the nucleolus organizer regions (Morescalchi and Ingram, 1974;King et al, 1979;Mahony and Robinson, 1986). All four species possess 2n = 24 very similar biarmed chromosomes and one pair of nucleolus organizers.…”

confidence: 99%

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Chromosome banding in Amphibia

Schmid

Haaf

Steinlein

et al. 2002

Cytogenet Genome Res

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The mitotic chromosomes of the Australian ground frogs Mixophyes fasciolatus and M. schevilli were analyzed by means of banding techniques and restriction endonuclease digestions. Chromosomal differentiation in these two species occurred exclusively by considerable changes in the amount of telomeric and centromeric heterochromatin, whereas the sizes and locations of interstitial heterochromatic regions, the sizes of all euchromatic segments as well as the positions of centromeres remained nearly identical during karyotype evolution. The major heterochromatic regions in the karyotypes of M. fasciolatus and M. schevilli amount to 30.2% and 20.7%, respectively. They consist of AT base pair-rich repetitive DNA sequences that are brightly labeled by AT-specific fluorochromes and display quenched fluorescence after staining with GC-specific fluorochromes. The heterochromatic regions can be differentiated by treatment of metaphase chromosomes and interphase cell nuclei with various restriction enzymes which either disclose the complete set of C-band patterns in the karyotypes of both species, or else reveal several subsets of these C-bands.

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Section: Constitutive Heterochromatin and Nucleolus Organizer Regionssupporting

confidence: 79%

confidence: 99%

Chromosome banding in Amphibia

Schmid

Haaf

Steinlein

et al. 2002

Cytogenet Genome Res

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“…Although only one species, L infrafrenata, has been karyotyped for New Guinean pelodriadine hylids, the karyotypes of about two dozen Australian species (Litoria and Cyclorana) are available for comparison (King, 1980;King et al, 1979;Morescalchi and Ingram, 1974;Stephenson and Stephenson, 1970;. The Australian and New Guinean species of the genus Litoria have the following karyotypic features in common.…”

Section: Discussionmentioning

confidence: 99%

“…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.…”

mentioning

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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Polyploidy in the Australian leptodactylid frog genus Neobatrachus

Mahony

Robinson

1980

Chromosoma

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Karyotypic analysis of six species of the Australian leptodactylid frog genus Neobatrachus showed that N. pictus, N. centralis, N. pelobatoides and N. wilsmorei are diploid (2n = 24) while N. sudelli and N. sutor are tetraploid (4n = 48). Polyploidy has not been reported previously among Australian anurans. Idiograms of the six species indicate that they are similar to the other Australian leptodactylids so far discribed. DNA values of the tetraploids are approximately double the values for diploids. Tetraploid nuclear and cell sizes are greater compared with diploids but total body size shows no increase. At diakinesis in primary spermatocytes of tetraploids, mainly tetravalents together with a few bivalents are present. Silver straining of metaphase spreads clearly demonstrates the location of NORs at the secondary constrictions and their frequent association in the tetraploid N. sutor. Nucleolar number in interphase nuclei provides a reliable guide for distinguishing tetraploid from diploid frogs in the absence of chromosome analysis and can be determined for both living and preserved specimens. The possible origins and relationships of the tetraploid species are discussed.

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Karyotypic Studies on Cyclorana and Associated Genera of Australian Frogs.

Cited by 9 publications

References 7 publications

Chromosome banding in Amphibia

Chromosome banding in Amphibia

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

Polyploidy in the Australian leptodactylid frog genus Neobatrachus

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