Plant Bugs are really what these are called; it's not just a generic term for insects that crawl around on plants.
There are many, many different kinds, going by various names; shield
bugs, stink bugs or tarnished plant bugs among them. These are all true
bugs, and in case you wanted more information, related to cockroaches.
They
have a hard shell, in this distinctive shape; some are long and
slender, others like this one, are wide and flat. The white spot on
this one is not just a reflection, it's actually a silvery colored part
of the hard shell.
These bugs generally have a long snout, which
they use to suck out the juices of plants; in some crops, specialty
plant bugs are considered pests, such as the Superb Plant Bug which
damages alfalfa.
Mostly, these are not really considered pests,
as they don't become too numerous, and are almost all specialists,
sticking to one plant or plant family. Many are distinguished only by
the plant they feed on, and only a dedicated entomologist could tell
them apart.
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