Holometabola


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Related to Holometabola: Holometabolous metamorphosis

Holometabola

[¦häl·ō·mə′tab·ə·lə]
(invertebrate zoology)
A division of the insect subclass Pterygota whose members undergo holometabolous metamorphosis during development.
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The Lag between the origin of the Holometabola and its eventual dominance
For the Holometabola, this is best explained by the presence of sufficient climatic oscillation in the Pangaean equatorial belt such that fitness benefits gradually would accrue to holometabolous clades through heightened interspecies competition and through creation of underutilized or otherwise ecologically transformed niches during the Permian (Roscher and Schneider, 2006; DiMichele et al.
There are important examples of ecologically important clades, which exhibit delayed lags in the fossil record that may differ or parallel the pattern exhibited by the Holometabola of the late Paleozoic and Triassic.
There are five summary points resulting from this exploration of the origin and early history of the Holometabola.
Four fossils assigned to the Holometabola have been identified throughout Early to Late Pennsylvanian (Late Carboniferous) deposits from the Illinois Basin and a site in Western Europe.
These four occurrences of the currently earliest documented Holometabola suggest an earlier divergence time of Late Mississippian (Serpukhovian Stage), from 328 to 318 million years ago.
Major temporal lag between the origin and eventual diversification of the Holometabola.
A priority for future paleobiological investigations of Paleozoic Holometabola.
18S ribosomal RNA genes of insects: primary structure of the genes and molecular phylogeny of the Holometabola.