Which species is significantly smaller, measuring only around 3.6 to 4.2 millimeters in length?
Answer
*Brychius hungerfordi*
The diversity in size among aquatic beetles, even within the broad order Coleoptera, is substantial. While some species, such as certain *Hydrophilus* species, are known to reach imposing or significant sizes, other species represent the smaller end of the spectrum. Specifically, the adult form of *Brychius hungerfordi* is characterized by its diminutive stature, with documented measurements indicating it is quite small, rarely exceeding a length between 3.6 and 4.2 millimeters. This small size contrasts markedly with the larger examples found within the water beetle community, such as the Giant Water Scavenger Beetle, highlighting the wide range of body dimensions present in freshwater habitats.
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