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The Chromosomes of Rhopalurus (Scorpiones-Buthidae)

Published online by Cambridge University Press:  31 May 2012

S. de Toledo Piza Jr.
S. de Toledo Piza Jr.
Affiliation:
Escola Superior de Agricultura “Luiz de Queiroz”Universidade de S. Paulo, Brasil
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Extract

In a series of papers it has been shown that Tityus chromosomes are provided with one centromere at each end (2, 4, 5 and 6). Proofs of such a view were found in the behaviour of the chromosomes in the course of spermatogenesis in the widely distributed Brasilian species T. bahiensis (Perty). Indeed, the long rod-shaped bivalents of this interesting species orient themselves in such a way that, while their bodies lie flat in the equatorial plane, the partners' corresponding ends are turned towards opposite poles. Metaphase side views show that the paired chromosomes are separated throughout their length. Being entirely unconnected by chiasmata, the chromosomes move toward the poles in perfect parallel, with the ends forward until late anaphase, when they bend strongly. Fragments bearing a single terminal centromere perform anaphase movement parallel to the spindle axis, as do the orthodox acrocentric rod-shaped chromosomes (11).

Type
Articles
Information
The Canadian Entomologist , Volume 89 , Issue 12 , December 1957 , pp. 565 - 568
Copyright
Copyright © Entomological Society of Canada 1957

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References

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