The morphological study has shown that the mandibular and maxillary stylets are suitable for the scratching-filtration mode; however, a clear trend for their modification can be observed in particular taxonomic groups of the Nepomorpha [ 19 ].
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Deliberations on the external morphology and modification of the labial segments in the Nepomorpha (Heteroptera: Insecta) with notes on the phylogenetic characteristics.
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