Graduate Thesis Or Dissertation
 

Comparative embryology of Nomia melanderi, Megachile rotundata, and Bombus griseocollis (Hymenoptera:Apoidea)

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  • Organogenesis was observed in different age embryos and first instar larvae of Nomia melanderi Cockerell (Halictidae), Megachile rotundata (Fabricius) (Megachilidae), and Bombus griseocollis (DeGeer) (Apidae) (Hymenoptera : Apoidea). It was found that, with the exception of the ventral nerve cord, comparable organ development had occurred by the beginning of the first instar larvae in all three species. Throughout egg development, Nomia and Megachile showed comparable organogenesis even though their incubation periods were different. Bombus had approximately the same length incubation period as Megachile, but the timing of organogenesis was completely different; Bombus eggs exhibited slow development at first followed by exceedingly rapid organogenesis. The determination of phylogenetic relationships was attempted within the three bee families on the basis of organogenesis. Criteria used were (1) the fusion in both the fibrous core of the suboesophageal ganglion and the ventral nerve cord ganglia, (2) reduction of rudimentary legs in the first instar larvae, and (3) timing of organ development.
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