STOLAINE CASSIDINES (COLEOPTERA, CHRYSOMELIDAE) WITH Xyp SEX CHROMOSOMES AND A DERIVATIVE SYSTEM XpneoXneoYp

1974 ◽  
Vol 16 (2) ◽  
pp. 433-440 ◽  
Author(s):  
E. S. de Vaio ◽  
A. Postiglioni
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
High Chromosome Number ◽  
Multiple Sex Chromosomes ◽  
Autosome Translocation ◽  
Derivative System ◽  
Very High

Three species of Cassidines were cytologically studied. Chelymorpha indigesta and C. variabilis, with 10II + Xyp, have a relatively primitive Coleopteran karyotype and the sex chromosomes form a parachute-like bivalent. Botanochara angulata, belonging to the same tribe, Stolaini, presents an exceptional karyotype with a very high chromosome number (2n = 51 ♀) and multiple sex chromosomes XpneoXneoYp. This system has derived from the Xyp by a yp-to-autosome translocation.

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

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.

Cicindelid beetles without multiple sex chromosomes (Coleoptera, Caraboidea)

1986 ◽  
Vol 28 (2) ◽  
pp. 235-239 ◽  
Author(s):  
J. Serrano ◽  
J. Galiàn ◽  
A. Ortiz
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
B Chromosomes ◽  
Chromosome Size ◽  
Evolutionary Patterns ◽  
Multiple Sex Chromosomes

The spermatogenesis of three species of Spanish cicindelid beetles has been studied. Megacephala euphratica has 2n = 30 + X, Cicindela paludosa has 2n = 14 + X and is polymorphic for B chromosomes, and C. littorea has 2n = 18 + X1X2X3Y. Differences in chromosome size and length, recombination index, and other cytogenetic characters are found between species. These differences suggest some evolutionary patterns for the autosomes and the heterosomes of the subfamily Cicindelinae, which are considered in relation to the systematics of this taxon.Key words: Cicindelid beetles, chromosome number, sex chromosomes.

scholarly journals Multiple sex-chromosomes in the marsupial, Potorous

Heredity ◽  
1952 ◽  
Vol 6 (3) ◽  
pp. 345-355 ◽  
Author(s):  
G B Sharman ◽  
H N Barber
Keyword(s):  
Sex Chromosomes ◽  
Multiple Sex Chromosomes

scholarly journals One more Microtus species with asynaptic sex chromosomes

2018 ◽  
Vol 70 (3) ◽  
pp. 443-447
Author(s):  
Jelena Blagojevic ◽  
Marija Rajicic ◽  
Vladimir Jovanovic ◽  
Tanja Adnadjevic ◽  
Ivana Budinski ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
Diploid Chromosome Number ◽  
First Finding ◽  
Chromosomal Polymorphisms ◽  
Southeastern Serbia

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.

Heteromorphic Sex Chromosomes and Their DNA Content in Fish: An Insight through Satellite DNA Accumulation in Megaleporinus elongatus

2020 ◽  
Vol 160 (1) ◽  
pp. 38-46 ◽  
Author(s):  
Carolina Crepaldi ◽  
Patricia P. Parise-Maltempi
Keyword(s):  
Sex Chromosomes ◽  
Dna Content ◽  
Satellite Dna ◽  
Sex Chromosome ◽  
Neotropical Fish ◽  
High Throughput Analysis ◽  
Multiple Sex Chromosomes ◽  
Heteromorphic Sex Chromosomes ◽  
Sex Chromosome System ◽  
Graph Based Clustering

The repetitive DNA content of fish sex chromosomes provides valuable insights into specificities and patterns of their genetic sex determination systems. In this study, we revealed the genomic satellite DNA (satDNA) content of Megaleporinuselongatus, a Neotropical fish species with Z1Z1Z2Z2/Z1W1Z2W2 multiple sex chromosomes, through high-throughput analysis and graph-based clustering, isolating 68 satDNA families. By physically mapping these sequences in female metaphases, we discovered 15 of the most abundant satDNAs clustered in its chromosomes, 9 of which were found exclusively in the highly heterochromatic W1. This heteromorphic sex chromosome showed the highest amount of satDNA accumulations in this species. The second most abundant family, MelSat02-26, shared FISH signals with the NOR-bearing pair in similar patterns and is linked to the multiple sex chromosome system. Our results demonstrate the diverse satDNA content in M. elongatus, especially in its heteromorphic sex chromosome. Additionally, we highlighted the different accumulation patterns and distribution of these sequences across species by physically mapping these satDNAs in other Anostomidae, Megaleporinusmacrocephalus and Leporinusfriderici (a species without differentiated sex chromosomes).

scholarly journals The Origin of Multiple Sex Chromosomes in Tiger Beetles

2002 ◽  
Vol 19 (10) ◽  
pp. 1792-1796 ◽  
Author(s):  
Jose Galián ◽  
James E. Hogan ◽  
Alfried P. Vogler
Keyword(s):  
Sex Chromosomes ◽  
Tiger Beetles ◽  
Multiple Sex Chromosomes

scholarly journals System of Multiple Sex Chromosomes in Eigenmannia trilineata López & Castello, 1966 (Sternopygidae, Gymnotiformes) from Iguatemi River Basin, MS, Brazil

CYTOLOGIA ◽  
2010 ◽  
Vol 75 (4) ◽  
pp. 463-466 ◽  
Author(s):  
Carlos Alexandre Fernandes ◽  
Dayani Bailly ◽  
Valéria Flávia Batista da Silva ◽  
Isabel Cristina Martins-Santos
Keyword(s):  
River Basin ◽  
Sex Chromosomes ◽  
Multiple Sex Chromosomes

KARYOLOGICAL RELATIONSHIPS IN TURTLES (REPTILIA: CHELONIA)

1972 ◽  
Vol 14 (4) ◽  
pp. 859-868 ◽  
Author(s):  
A. Dean Stock
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
Mitotic Chromosomes ◽  
Meiotic Chromosomes ◽  
Telocentric Chromosomes ◽  
Chromosome Karyotype

The mitotic chromosomes of 33 species of chelonians representing 22 genera and six families were investigated. Chromosome number and morphology are the same for most members of a given family and range from 66 in Trionyx to 34 in Pelomedusa. Most emydid genera have 50 chromosomes. The karyotype of Chelydra (2n = 52) is similar to those of some testudinid and emydid genera and is unlike the 56 chromosome karyotype of kinosternid turtles. The three genera of tortoises examined, Gopherus, Testudo, and Geochelone, have 52 chromosomes, but Gopherus differs in karyotypic details. The karyotype of Geochelone is like that of Chelydra and the 52 chromosome genera of emydid turtles. The African pleurodiran Pelomedusa has three additional pairs of small acrocentric or telocentric chromosomes not present in the earlier described karyotype of Podocnemis. Examination of meiotic chromosomes revealed frequencies of chiasmata formation similar to those reported earlier. Sex chromosomes were not distinguishable.

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