Abstract
SUMMARYScyllina signatipennis is a Gomphocerine grasshopper whose male karyotype of 23 telocentric chromosomes includes 11 autosomal pairs (3 long: L1-L3; 5 medium-sized: M4-M8; short: 3 S9-S11) and an X-chromosome. Males show an extreme pattern of proximal chiasma localization during meiosis which is characterized by a preleptotenic contraction stage followed by an unravelling stage which precedes a typical leptotene. The nucleus then enters a prolonged diffuse stage that comprises most of zygotene and pachytene. Post-diffuse nuclei represent an intermediate stage between pachytene and diplotene and at this time some homologous pairing is evident. Usually, only one chiasma per bivalent is observed and chiasma frequency per cell ranges from 11.00 to 11.15. An analysis of the percentage of pairing in post-diffuse nuclei suggests that incomplete pairing cannot be the cause of chiasma localization in this species. A role for the diffuse stage in determining chiasma localization is suggested since other speci...
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