The somatic chromosomes of 3 lizard species:Gekko gecko,Iguana iguana,andCrotaphytus collaris

Zusammenfassung Die somatischen Chromosomen der 3 EidechsenartenGekko gecko (2N=38),Iguana iguana (2N=34) undCrotophytus collaris (2N=36), werden dargestellt.G. gecko besitzt metazentrische, subteleozentrische und teleozentrische Elemente, aber keine Mikrochromosomen.I. iguana undC. collaris besitzen Makrochromosomen (6 Paare) und Mikrochromosomen. Bei den ArtenG. gecko undI. iguana waren in keinen von beiden Geschlechtern heteromorphische Chromosomenpaare nach zuweisen.

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Supported by Project No. 417 from the U.S. Children's Bureau and Grant No. 08737 from the National Cancer Institute.     

Sex chromosomes of a pygopodid lizard,Lialis burtonis

Zusammenfassung Es wird erstmals über den Karyotyp einer Eidechse der Familie Pygopodidae,Lialis burtonis mit dem GeschlechtschromosomensystemX ₁ X ₂ Y berichtet. Die diploide Chromosomenzahl des Männchens ist 33 und diejenige des Weibchens 34. Morphologisch scheint der Karyotyp eine Ähnlichkeit mit demjenigen der Geckoniden zu besitzen.     

The chromosomes of four species of Falconiformes

Summary Leucocyte cultures were used in four species of Falconiformes for the purpose of karyotypic sex determination and the establishment of a breeding pair. The Andean condor has 80 Guiana eagle 54, Crane hawk 66, and Turkey vulture 76 chromosomes with readily distinguished ZW elements in the female.Our cordial thanks are extended toA. Risser, Ph. D. Assistant Curator of Birds, San Diego Zoo;Warren Thomas, D.V.M., Director, Los Angeles Zoo for their cooperation and assistance in the collection of blood samples for chromosome study. We are also grateful toK. Benirschke, M.D., Director of Research, San Diego Zoo for his kind assistance.     

The karyotype ofMicrotus cabrerae Thomas,another species with giant sex chromosomes

Summary The karyotype ofMicrotus cabrerae, a species endemic to Spain, is described. It comprises 2n=54 chromosomes, with a fundamental number of 64, and with very large sex chromosomes. An evolutionary relationship between this species andM. chrotorrhinus is suggested.     

The chromosomes of two species of the genusOryzomys (rodentia-cricetidae)

Resumen Oryzomys es un género altamente politípico y primitivo que ocupa un área geográfica que se extiende por todo el continente Sudamericano y el sur de Norteamérica. De este género se describen los cromosomas de dos especies pertenecientes al subgéneroOryzomys. O. albigularis (posiblementeO. a. camcolus) (2N=66) yO. delicatus (2N=60) cuyos cromosomas son fundamentalmente del tipo acrocéntrico o subtelocéntrico con algunos pares matacéntricos o submetacéntricos.     

The chromosomes ofBufo rubropunctatus andBufo chilensis (Anura,Bufonidae) and other species of thespinolosus group

Summary The chromosomes ofBufo rubropunctatus andB. chilensis (on basis of adults) are described for the first time. These chromosomic sets are compared with the karyotypes ofB. spinolosus andB. variegatus and other species ofspinolosus group. The importance of the secondary constrictions applied to the phylogeny ofBufo are discussed.Supported by Proyecto N⁰ S-77-47, Dirección de Investigación, Universidad Austral de Chile.I would like to thank Dr J. M. Cei for collecting the Argentinian toads. Mr N. Diaz collected the specimens from Santiago, Chile.The technical assistence of Sonia Lacrampe is acknowledged with appreciation.     

Distribution of constitutive heterochromatin (C-bands) in the somatic chromosomes of an Indian bird,Chrysomma sinense (Gmelin)

Summary The localization of constitutive heterochromatin has been studied in a passerine bird,Chrysomma sinense (2n=±70). In all the 7 pairs of macrochromosomes pericentric heterochromatin has been observed as usual except in pairs Nos 2 and 4, in which both pericentric and non-centromeric heterochromatin have been recorded.The authors are grateful to Prof. B. K. Behura, Department of Zoology, Utkal University, for necessary laboratory and library facilities. T.S. is grateful to the CSIR for providing financial assistance under the JRF scheme.     

The mitotic chromosomes of the lamprey,Petromyzon marinus L.

Résumé L'étude des chromosomes somatiques de la lamproie,Petromyzon marinus L. a montré que l'équipment chromosomique diploïde de cette espèce est composé de 168 chromosomes très petits, dont queleues-uns des plus grands sont métacentriques. Le chiffre semble représenter le plus grand nombre de chromosomes trouvé dans une espèce de Vertébré. On a comparé les chromosomes de P.marinus avec ceux des autres espèces de lamproies.

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Holder of a Science Research Council Fellowship.     

The chromosomes of the southern hemispheric lamprey,Geotria australis Gray

Summary Approximately 180 small and mainly acrocentric chromosomes are present inGeotria australis (Geotriidae) from the southern hemisphere. This is closer to the situation found in northern hemispheric species (Petromyzonidae) than in other southern hemispheric lampreys (Mordaciidae).We wish to express our gratitude to Mr R. W. Hilliard and Mr D. J. Bird for technical help. Financial assistance was provided by the Australian Research Grants Committee.     

The mitotic chromosomes of the lampreyMordacia mordax (agnatha: Petromyzonidae)

Résumé L'étude des chromosomes somatiques de la lamproie de l'hémisphère sud,Mordacia mordax (Richardson), montre que l'équipement chromosomique diploïde de cette espèce est composé de 76 chromosomes très petits. La plupart des chromosomes sont métacentrique ou bien submétacentrique. Ces chromosomes sont différents en nombre de ceux décrits pour les lamproies de l'hémisphère nord.