| diapause and prolonged development in the embryo and their ecological significance in two cicadas, cryptotympana facialis and graptopsaltria nigrofuscata. | the seasonal timing mechanism of egg hatching was examined in two cicadas, cryptotympana facialis and graptopsaltria nigrofuscata, with different but overlapping geographical distributions. these species lay eggs in summer, and nymphs hatch in the summer of the following year after egg durations of 10-12 months. when eggs were maintained at 25 degrees c from oviposition, both the species entered embryonic diapause within 60 days irrespective of photoperiod, but at different developmental stages ... | 2008 | 18789945 |
| ultrastructure and function of long and short sperm in cicadidae (hemiptera). | the cicada, graptopsaltria nigrofuscata, produces two distinct sizes of sperm, as determined by either nuclear volume of early spermatids or nuclear length of mature sperm. between both sperm, there is no difference in location of the acrosome and flagellum during spermiogenesis. the acrosome is covered by an anteacrosomal bleb, which is inserted in a common mass, spermatodesm, derived from cyst cells. both kinds of sperm linked to the spermatodesm form sperm bundles, respectively. during copula ... | 2003 | 14568575 |
| vitellogenin of the cicada graptopsaltria nigrofuscata (homoptera): analysis of its primary structure. | we cloned and sequenced the cdna of vitellogenin (vg) from the cicada graptopsaltria nigrofuscata (homoptera). the deduced amino acid sequence of 1987 residues (including 16 residues for a putative signal peptide) was obtained. the pro-vg was cleaved into two subunits between residues 379 and 380 following a consensus rxxr cleavage site sequence, secreted as s-vg (apparent molecular weight 43 kda) and l-vg (200 kda), sequestered, and stored in the egg as two vitellins (vns), s-vn and l-vn, with ... | 2000 | 10646965 |