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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

(1)Brieger, F. G. and Graner, E. A.. 1943. On the cytology of Tityus bahiensis with special reference to meiotic prophase. Genetics, 28: 269–274.CrossRefGoogle ScholarPubMed
(2)Piza, S. de Toledo Jr., , 1939. Comportamento dos cromossômios na primeira divisâo do espermatocito do Tityus bahiensis. Sci. Genet., 1: 255–261.Google Scholar
(3)Piza, S. de Toledo Jr., , 1940. Poliploidia natural em Tityus bahiensis (Scorpiones) associada a aberracôes cromossômicas espontáneas. Rev. Biol. Hyg., 10: 143–155.Google Scholar
(4)Piza, S. de Toledo Jr., , 1941. Chromosomes with two spindle attachments in the Brasilian scorpion Tityus bahiensis Perty. J. Hered., 32: 423–426.CrossRefGoogle Scholar
(5)Piza, S. de Toledo Jr., , 1943. The uselessness of the spindle fibers for moving the chromosomes. Am. Nat., 77: 442–462.Google Scholar
(6)Piza, S. de Toledo Jr., , 1943. Meiosis in the male of the Brasilian scorpion Tityus bahiensis. Rev. Agric., (Piracicaba,) 18: 249–276.Google Scholar
(7)Piza, S. de Toledo Jr., , 1943. A proposito da meiose do Tityus bahiensis. Rev. Agric., (Piracicaba), 18: 351–369.Google Scholar
(8)Piza, S. de Toledo Jr., , 1947. Notas sôbre cromossômios de alguns escorpiôes brasileiros. Ann. Esc. Sup. Agr. “Luiz de Queiroz”, 4: 169–176.CrossRefGoogle Scholar
(9)Piza, S. de Toledo Jr., , 1947. Interessante comportamento dos cromossômios na espermatogênese do escorpiào Isometrus maculatus De Geer. Ann. Esc. Sup. Agr. “Luiz de Queiroz”, 4: 177–182.CrossRefGoogle Scholar
(10)Piza, S. de Toledo Jr., , 1948. Primeiras observaçôes sobre os cromossômios de Tityus trivittatus Krpl. (Scorpiones-Buthidae). Rev. Agric., (Piracicaba), 23: 177–180.Google Scholar
(11)Piza, S. de Toledo Jr., , 1949. “Ouro Preto”, nova e interessante raça cromossômica de Tityus bahiensis (Scorpiones-Buthidae). Sci. Genet., 3: 147–159.Google Scholar
(12)Piza, S. de Toledo Jr., , 1950. The present status of the question of the kinetochore. Gen. Iber., 2: 193–199.Google Scholar
(13)Piza, S. de Toledo Jr., , 1952. Primeiras observaçôes sôbre os cromossômios do Tityus metuendus Pocock (Scorpiones-Buthidae). Sci. Genet., 4: 162–167.Google Scholar
(14)Rhoades, M. M. and Kerr, W. E.. 1949. A note on centromere organization. Proc. Nat. Acad. Sci., 35: 129–132.CrossRefGoogle ScholarPubMed
(15)Sharp, L. W. 1943. Fundamentals of Cytology. McGraw Hill Book Company, Inc., New York and London, First Edition, Fig. 80, p. 110.Google Scholar
(16)Sharp, L. W. 1943. The same, second impression. Same p. and fig.Google Scholar
(17)White, M. J. D. 1945. Animal Cytology & Evolution. Cambridge Univ. Press, VIII–375.Google Scholar