Summary
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1.
Species of the genus Compsothespis have an X1X2Y trivalent in the male with both ends of the X2 chromosome associated with the same end of the Y. This X1X2Y mechanism must have had an independent origin from the one found in the Mantinae sensu stricto.
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2.
A second species of Rhodomantis has been shown to have an X1X2Y trivalent in which X1 and X2 are associated with the same limb of the Y, leaving the other limb free. The sex chromosome mechanisms of Compsothespis and Rhodomantis both imply the existence of triple synaptic segments.
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3.
The genera Bolbe, Ligaria, Hoplocorypha, Antistia, Dystacta, Bisanthe and Harpagomantis have XO males.
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4.
A species of Dystacta is polymorphic for a pericentric inversion. A species of Hoplocorypha and one of Antista are polymorphic for fusions or dissociations.
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5.
The genera Sphodropoda, Polyspilota and Archimantis belong to the group of X1X2Y Mantinae sensu stricto. It has been shown that those members of this group which have very small Y-chromosomes have the pairing limbs of the X1 and X2 chromosomes unusually long; it is probable that this situation is due to translocations having occurred whereby material was transferred from the Y to the X's.
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6.
Bolbe and Harpagomantis are added to the list of mantid genera with achiasmatic meiosis (Callimantis-type) in the male. Achiasmatic meiosis has probably been evolved at least five times in the phylogeny of the mantids.
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7.
Some comparisons are made between the achiasmatic mechanisms which have evolved in certain mantid genera and in a few species of Thericleine Eumastacid grasshoppers.
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Dedicated to my friend Professor Sajiro Makino, with respect and admiration, on the occasion of his sixtieth birthday.
Supported in part by Public Health Service Grant GM 07212-04 from the Division of General Medical Sciences, U.S. National Institutes of Health.
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White, M.J.D. Sex chromosomes and meiotic mechanisms in some African and Australian Mantids. Chromosoma 16, 521–547 (1965). https://doi.org/10.1007/BF00326972
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DOI: https://doi.org/10.1007/BF00326972