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Updated: May 11, 2025
Gyrinidae swam round and round in mazy circles; Dytiscidae came up to the surface for a moment, and dived down again to the depths below with a globule of air glistening like a diamond. Amongst the vegetation at the bottom and sides of the pools Hydrophilidae crawled about, just as in ponds in England.
Sharp remarks that this wide distribution and great similarity of the Dytiscidae is of special interest when we recollect that they are nothing but Carabidae fitted for swimming, and yet that the Carabidae are one of the groups in which the tropical members differ widely from the temperate ones.
He believes there is no family of Coleoptera in which tropical or extra-tropical species so closely resemble one another as in the Dytiscidae. Cybister is found in Europe, Asia, Africa, Australia, New Zealand, Brazil, and North America; and the species have a very wide range. Dr.
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