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The early embryology of Diabrotica undecimpunctata howardi (coleoptera: Chrysomelidae)
Author(s) -
Krysan James L.
Publication year - 1976
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.1051490107
Subject(s) - biology , cleavage (geology) , embryology , botany , developmental biology , microbiology and biotechnology , anatomy , embryogenesis , embryo , paleontology , fracture (geology)
Early embryogenesis is described for the southern corn rootworm, Diabrotica undecimpunctata Howardi Barber, at 24 ± 1°C. During the first four hours following oviposition, the maturation divisions and syngamy are completed. Morphological changes in the second polar body accompany syngamy. Cleavage divisions and energid migration occur during the fourth to the tenth hour. The vitellophags, which appear during cleavage divisions, are distinguished from the blastema‐bound nuclei by having smaller, more densely staining nuclei. After completion of a uniform blastoderm (11‐14 hour), cell division ceases until the completion of the germ band and the formation of the embryonic membranes (22 hour). This species has a pattern of amnion formation that is different from most Coleoptera but is shared with a few other chrysomelids, some Isoptera, and some Odonata.