outsized specimens of the same species.
Pennak says that aquatic sow bugs (isopods) and scuds (amphipods) usually
range from 5-20 mm so an inch-long specimen would not be out of the
question. I've never seen really "big" freshwater isopods. I've seen some
pretty big amphipods though, especially in springs, and some species of
Gammarus routinely excede 20 mm.
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