One more Microtus species with asynaptic sex chromosomes

Arvicoline voles are known as a karyotypically extremely polymorphic group in which the genus Microtus leads with the highest rate of karyotype change. A member of this genus, the European pine vole Microtus subterraneus (de Selys-Longchamps, 1836), is widely distributed in Europe and parts of Asia. There are two cytotypes differing in diploid chromosome number, 2n=54 and 52, each showing different chromosomal polymorphisms. At two localities in southeastern Serbia, Mt. Jastrebac and Vlasina, we found the 2n=52 cytotype. Meiotic preparations from males revealed the presence of asynaptic sex chromosomes. Although asynaptic sex chromosomes are frequent in Microtus, this is the first finding for M. subterraneus. From summarized data it appears that two-thirds of the studied species, mainly from Microtus and Terricola subgenera, possess asynaptic sex chromosomes.

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First Record on Sex Chromosomes in a Species of the Family Cynodontidae: Cynodon gibbus (Agassiz, 1829)

Cytogenetic and Genome Research ◽

10.1159/000505889 ◽

2020 ◽

Vol 160 (1) ◽

pp. 29-37 ◽

Cited By ~ 1

Author(s):

Vanessa S. Pinheiro Figliuolo ◽

Leonardo Goll ◽

Patrik Ferreira Viana ◽

Eliana Feldberg ◽

Maria C. Gross

Keyword(s):

Chromosome Number ◽

Repetitive Dna ◽

Sex Chromosomes ◽

First Record ◽

Diploid Chromosome Number ◽

Fish Family ◽

Female Heterogamety ◽

The Family

The fish family Cynodontidae belongs to the superfamily Curimatoidea, together with the Hemiodontidae, Serrasalmidae, Parodontidae, Prochilodontidae, Chilodontidae, Curimatidae, and Anostomidae. The majority of the species of this superfamily that have been analyzed to date have a diploid chromosome number of 2n = 54. Differentiated sex chromosomes (with female heterogamety) have been observed only in the Prochilodontidae, Parodontidae, and Anostomidae. The present study provides the first description of differentiated sex chromosomes in the cynodontid species Cynodon gibbus, which has a ZZ/ZW system, and shows that repetitive DNA has played a fundamental role in the differentiation of these sex chromosomes.

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Karyotypic and Morphometric Analysis of A Predatory Rove Beetle, Paederus littoralis (Coleoptera: Staphylinidae) from Jammu Region of Outer Himalayas, India

Biosciences Biotechnology Research Asia ◽

10.13005/bbra/2654 ◽

2018 ◽

Vol 15 (2) ◽

pp. 495-499

Author(s):

Arshad Ayoub Bhatti ◽

Manvi Khajuria

Keyword(s):

Chromosome Number ◽

Y Chromosome ◽

Morphometric Analysis ◽

Sex Chromosomes ◽

Diploid Chromosome Number ◽

Cereal Aphids ◽

Rove Beetle ◽

The Family ◽

Telocentric Chromosomes ◽

Chromosomal Data

In the present study, the chromosomes of a predatory rove beetle Paederus littoralis were studied from Jammu region of outer Himalayas. These beetles are also potential bio-control agents in suppressing the populations of cereal aphids. The diploid chromosome number was found to be 2n=32 including 22 metacentric, 3 submetacentric, 6 subtelocentric and 1 telocentric chromosomes. The sex chromosomes (Xyp) included submetacentric X and telocentric y chromosome. Meiotic observations comprised diplotene, diakinesis and metaphase-I. The study is helpful in solving taxonomic problems with in the family Staphylinidae and it authenticates the existence of this particular species through chromosomal data.

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Chromosome studies of three families of pelagic heteropod molluscs (Atlantidae, Carinariidae, and Pterotracheidae) from Hawaiian waters

Canadian Journal of Zoology ◽

10.1139/z97-030 ◽

1997 ◽

Vol 75 (2) ◽

pp. 237-244 ◽

Cited By ~ 5

Author(s):

Catherine Thiriot-Quiévreux ◽

Roger R. Seapy

Keyword(s):

Chromosome Number ◽

Sex Chromosomes ◽

Diploid Number ◽

Diploid Chromosome Number ◽

Striking Difference ◽

Evolutionary Trends ◽

Air Drying ◽

Submetacentric Chromosome ◽

Heteromorphic Sex Chromosomes ◽

Males And Females

Chromosome number and morphology were studied in gonadal tissue of 11 species of Atlantidae, 2 species of Carinariidae, and 3 species of Pterotracheidae, using an air-drying technique and Giemsa staining. In the Atlantidae the diploid chromosome number was the same in males and females and there were no heteromorphic chromosomes. The diploid chromosome number in nine species of Atlanta was 30 and the majority of chromosome pairs were metacentric and submetacentric. In Protatlanta souleyeti the diploid number was 28, and included five metacentric, six submetacentric, and three subtelocentric chromosome pairs. Oxygyrus keraudreni had a diploid chromosome number of 32, with 10 metacentric and 6 submetacentric chromosome pairs. A striking difference between the Atlantidae and the Carinariidae and Pterotracheidae was the presence of heteromorphic sex chromosomes in the latter two families. Male Pterosoma planum (2n = 32) had simple XY sex chromosomes, but males of Carinaria japonica (2n = 33), Pterotrachea scutata (2n = 33), Pterotrachea hippocampus (2n = 31), and Firoloida desmaresti (2n = 31) showed three heteromorphic chromosomes, suggesting a multiple sex-determining mechanism, X1X2Y. The locations of the female sex chromosomes in the karyotypes of female Pterotrachea hippocampus (2n = 32) and Firoloida desmaresti (2n = 32) were tentatively proposed. Cytogenetic features observed among the three families are supportive of previous interpretations of evolutionary trends in the Heteropoda based on morphology, i.e., that the Atlantidae are the most primitive family and gave rise to the Carinariidae and Pterotracheidae.

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New cytogenetic data on Coreoidea (Hemiptera: Heteroptera) with special reference to Coreidae

Zootaxa ◽

10.11646/zootaxa.3313.1.6 ◽

2012 ◽

Vol 3313 (1) ◽

pp. 53 ◽

Cited By ~ 3

Author(s):

HAILIN YANG ◽

HU LI ◽

XUN DAI ◽

JIAN CHANG ◽

WANZHI CAI

Keyword(s):

Chromosome Number ◽

Special Reference ◽

Sex Chromosomes ◽

Meiotic Division ◽

Phylogenetic Relationships ◽

Male Meiosis ◽

Point Of View ◽

Diploid Chromosome Number ◽

Holokinetic Chromosomes ◽

The Family

Some cytogenetic aspects of six Chinese species of Coreoidea were studied. The material included five species from the familyCoreidae: Hydarella orientalis (Distant), Homoeocerus bannaensis Hsiao, Cletus graminis Hsiao & Cheng, Paradasynus lon-girostris Hsiao, Acanthocoris scaber (Linnaeus), and one species from the family Stenocephalidae: Stenocephalus femoralisReuter. All species show holokinetic chromosomes, post-reductional meiotic division of XO sex chromosomes, a pre-reduc-tional type of meiosis for autosomes and m-chromosomes, intersticial chiasmata in most autosomes, and one chiasma per biva-lent in male meiosis. In the species studied, the diploid chromosome number ranged from 13 to 21. It was 13 in S. femoralis (10+ 2m + XO), 15 in Hy. orientalis (12 + 2m + XO), 17 in Ho. bannaensis (14 + 2m + XO) and C. graminis (14 + 2m + XO), 19in P. longirostris (16 + 2m + XO), and 21 in A. scaber (18 + 2m + XO). Hy. orientalis represents the first cytogenetically stud-ied species in subfamily Hydarinae. The phylogenetic relationships among Coreoidea are briefly discussed from a cytogenetic point of view.

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The karyotype of amphioxus Branchiostoma belcheri tsingtauense (Cephalochordata)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315403006969h ◽

2003 ◽

Vol 83 (1) ◽

pp. 189-191 ◽

Cited By ~ 7

Author(s):

Changliu Wang ◽

Shicui Zhang ◽

Yongzhong Zhang

Keyword(s):

Chromosome Number ◽

Sex Chromosomes ◽

Diploid Chromosome Number ◽

Embryonic Cells ◽

First Report ◽

Branchiostoma Belcheri

The chromosome number and karyotype of amphioxus Branchiostoma belcheri tsingtauense were studied using embryonic cells. The diploid chromosome number (2n) of B. belcheri tsingtauense is 36, and its karyotype 2n=36, 2st+34t, FN=36. This is the first report on the karyotype of the cephalochordate. Evidence suggesting the possible presence of a pair of sex-chromosomes in the amphioxus has been provided.

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The Chromosomes of 4 Genera of Possums From the Family Petauridae (Marsupialia, Diprotodonta)

Australian Journal of Zoology ◽

10.1071/zo9900033 ◽

1990 ◽

Vol 38 (1) ◽

pp. 33 ◽

Cited By ~ 4

Author(s):

JD Murray ◽

SC Donnellan ◽

GM Mckay ◽

RH Rofe ◽

PR Baverstock ◽

...

Keyword(s):

Chromosome Number ◽

Sex Chromosomes ◽

Chromosome Numbers ◽

Chromosomal Rearrangement ◽

Diploid Chromosome Number ◽

The Family ◽

Relationship Of ◽

The Relationship ◽

Petaurus Australis

The standard and C-banded (four species) karyotypes of six species of the family Petauridae (Gymnobelideus leadbeateri, Petaurus australis, P. breviceps, P. norfolcensis, Dactylopsila trivirgata and Dactylonax palpator) are described. The G-banded karyotype of P. norfolcensis is also described. Gymnobelideus and Petaurus have diploid chromosome number of 22. All three species of Petaurus have a similar karyotype, consisting of biarmed autosomes and very small sex chromosomes, which differs from Gymnobelideus by a minimum of one chromosomal rearrangement of each autosome. Dactylopsila and Dactylonax have similar karyotypes with diploid chromosome numbers of 18. The relationship of these two genera to Petaurus is still uncertain but all members of this family differ from Pseudocheiridae in the small size of the sex chromosomes.

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The karyotype of the skink, Mabuya blandingi

Canadian Journal of Genetics and Cytology ◽

10.1139/g84-017 ◽

1984 ◽

Vol 26 (1) ◽

pp. 100-103 ◽

Cited By ~ 2

Author(s):

J. A. Adegoke

Keyword(s):

Bone Marrow ◽

Chromosome Number ◽

Sex Chromosomes ◽

Diploid Chromosome Number ◽

Male And Female ◽

Fundamental Number

The chromosomes of Mabuya blandingi were studied from the bone marrow of male and female animals. The diploid chromosome number in this organism is 32, consisting of 10 large-, 10 medium-, and 12 small-size chromosomes. The fundamental number (NF) is 48. The chromosome complements in both the male and female animals are similar in morphology with no evidence of differentiated sex chromosomes.

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High Chromosome Number and Giant Postreductional Sex Chromosomes in the Beetle Walterianella venusta Schaufuss (Chrysomelidae, Alticinae)

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v47i3.12947 ◽

1969 ◽

Vol 47 (3) ◽

pp. 154-163

Author(s):

Niilo Virkki

Keyword(s):

Chromosome Number ◽

Sex Chromosomes ◽

High Chromosome Number

A high chromosome number for a coleopteran, 22-J-X+y, was encountered in an alticine, Walterianella venusta Schaufuss. The autosomes are very short, metacentric; the sex chromosomes very long and also metacentric. The sex chromosomes are desynaptic and postreductional in spermatogenesis. It is assumed that two trends operate in the evolution of the alticine chromosomes, first, the autosomal chromatin being incorporated repeatedly in the sex chromosomes, and second, the occurrence of the multiplication of the short autosomes.

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Sources of progesterone during gestation in Barbary sheep (Ammotragus lervia)

Journal of Endocrinology ◽

10.1677/joe.0.0980283 ◽

1983 ◽

Vol 98 (2) ◽

pp. 283-NP ◽

Cited By ~ 8

Author(s):

A. P. F. Flint ◽

R. D. Burton ◽

R. B. Heap

Keyword(s):

Chromosome Number ◽

Corpus Luteum ◽

Late Pregnancy ◽

Hydroxysteroid Dehydrogenase ◽

Point Of View ◽

Diploid Chromosome Number ◽

Domestic Sheep ◽

Ammotragus Lervia ◽

Barbary Sheep ◽

Venous Plasma

Concentrations of progesterone in arterial and ovarian, uterine and jugular venous plasma were determined in four Barbary sheep at various stages of pregnancy. The results, together with ovarian histology, show that the corpus luteum regresses before term in Barbary sheep, as in most breeds of domestic ewes. Uterine synthesis of progesterone was demonstrated in late pregnancy in two animals in which uterine venous levels of progesterone were increased two- to fourfold above arterial concentrations. The placenta contained 3β-hydroxysteroid dehydrogenase. Barbary sheep (diploid chromosome number, 2N = 58) therefore resemble the domestic sheep (2N = 54) rather than the goat (2N = 60) from the point of view of the source of the progesterone required for maintenance of pregnancy.

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