Richard Jones: Why beetles are the most important organisms on the planet

By Dilip -
The phrase “they come in all shapes and sizes” could have been coined just for the Coleoptera — the beetles. At a fragile 0.325mm long, the Colombian featherwing (Scydosella musawasensis) has a good claim to being one of the smallest free-living insects in the world, and is tinier than many single-celled creatures. At the other end of the spectrum, the obviously named titan beetle, a huge Brazilian longhorn that can snap a pencil in its jaws, reaches 167mm – about 500 times the size.
Coleoptera range from the narrow sylph-like elegance of the mould beetle (Adistemia watsoni) crawling up the musty wall of a museum store-room, to the burnished brass bauble of the golden leaf beetle (Chrysolina banksi),cumbersomely crawling over the black horehound plant it feeds on.

They occur from seashore to mountain top. Around the south and west coasts of Britain, the tiny pale ground beetle (Aepus robinii) survives in silt-filled cracks in seashore rocks, and is covered up by the tide twice a day. Meanwhile the rainbow leaf beetle (Chrysolina cerealis) is only known (in Britain at least) from Snowdon in Wales, where its chubby larvae feed on a few clumps of stunted thyme growing on the windswept mountainsides.

Beetles (or more often their larvae) eat anything from wild and garden plants (too many gardeners revile the poor old lily beetle (Lilioceris lilii), to pollen, algal film, leaves, fruits, nuts, stems, roots, dung, carrion, rotten wood, construction timber, harvested grain, stored food, other invertebrates, and each other. They live in water, up trees, in the soil, in ant nests, in bee burrows, in our homes; they visit flowers, they patrol leaves, they fly and bump at the lighted window of a late summer evening. Platypsyllus castoris lives in the pelts of beavers, scraping a living from dead skin and sebaceous secretions. Beetles live everywhere and do everything… read more:

https://www.theguardian.com/environment/blog/2018/jan/25/why-beetles-are-the-most-important-organisms-on-the-planet


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