Roaches vs Water Bugs
当考虑蟑螂时,蟑螂和水虫等通用名称总是会产生误导,因为它们被用来在某些地区引用同一群动物。尽管水虫术语意味着半翅目昆虫,但它仍被用来引用世界某些地方的蟑螂。因此,为了清楚地了解这些动物,应该充分理解水虫和蟑螂的特征,并且这些特征也很容易遵循。本文打算提供有关蟑螂和水错误的足够信息,以便即使是普通人也应该能够理解它们之间的区别。
Roaches
Roaches are a highly diversified group of insects with more than 4,500 species, and they are classified under the Order: Blattodea. There are eight families of roaches, but only four species have become serious pests. However, about 30 species of roaches have been living around the human habitations. The most important aspect of the roaches is that their ability to withstand the mass extinctions. In a simple term, roaches have never failed to survive any of the mass extinctions taken place on the Earth since their beginning 354 million years ago in the Carboniferous period. Compared to most of the other insects, roaches are large with about 15 – 30 millimetres long body. The largest recorded species is the Australian giant burrowing roach with about a nine-centimetre long body. They all have a dorso-ventrally flattened body with a small head. The mouthparts are adapted to feed on any type of food, which is an indication of their generalised food habits. Therefore, whatever is available could be food for roaches. Their basis of survival through more than 350 million years is well explained using their generalised food habits. They have large compound eyes and two long antennae. The whole body is not as hard as in many insects, but the first pair of wings are hard and the second pair is membranous. Their legs have coxae and claws for protection and other functions. Roaches could be serious pests not only for food destroyers, but also as dispersal agents of diseases such as asthma.
水蝽
There are few types of insects referred as water bugs, but only the true water bugs are considered in this article. True water bugs belong to the Infraorder: Neomorpha of the Order: Hemiptera. They are referred as true water bugs, as their habitat being water. The earliest fossil of a water bug dates back to 250 million years. Currently, there are about 2,000 water bug species, and they are distributed all over the world except in the Polar Regions. The majority of true water bugs live in freshwaters while there are some brackish water and saltwater species, as well. They to be hemipterans, their forewing is hardened anteriorly but not the posterior half. The ocelli are absent in water bugs, but sometimes those are vestigial. Water bugs are usually omnivorous insects, and they feed on both plant matter and prey upon small invertebrates and small larvae of amphibians. However, there are some giant water bug species with the capability of preying upon some fish and amphibian species.
What is the difference between Roaches and Water Bugs? • Roaches are more diversified than water bugs. • Roaches exist more than 100million years before the water bugs did. • Roaches are more generalised than water bugs are. •前翅膀在蟑螂中完全硬化,而只有前一半的前翅则在水虫中被硬化。 • Roaches could be serious pests but not the water bugs. • Body is dorso-ventrally flattened in roaches but not in water bugs. • Roaches have a large pair of eyes, but the ocelli are vestigial or absent in water bugs. |
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