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Fertilization, syngamy, and early embryonic development in the cricket Gryllus bimaculatus (de geer)
Author(s) -
Sato Motoaki,
TanakaSato Hikaru
Publication year - 2002
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.10033
Subject(s) - biology , gryllus bimaculatus , pronucleus , cricket , mitosis , sperm , anatomy , human fertilization , cleavage (geology) , microbiology and biotechnology , meiosis , embryogenesis , embryo , botany , zygote , zoology , genetics , paleontology , fracture (geology) , gene
Fertilization and early embryonic mitoses of the cricket Gryllus bimaculatus were examined by fluorescence staining of whole‐mount as well as squash preparations. Egg meiosis occurs near the ventral surface of the egg, while sperm transforms into a sperm pronucleus in the cytoplasmic island on the dorsal side. After meiosis, the egg pronucleus moves across the egg toward the sperm pronucleus in the island, where union of these nuclei occurs. The first cleavage mitosis is gonomeric, as in insects such as Pyrrhocoris, Drosophila, and Bombyx. After the third cleavage the synchrony of nuclear division is lost and the dividing nuclei are distributed all over the egg by 12 h after deposition. J. Morphol. 254:266–271, 2002. © 2002 Wiley‐Liss, Inc.