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Arthropods - PowerPoint Presentation Example

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Richness is a measure of the total number of species, while evenness is the number of a particular species relative to that of other species.
The Shannon Index (H’) and Simpson’s Index (D) are the two…
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Download file to see previous pages Among the arthropods, insects portray the highest degree of species diversity (Lecointre & Guyanden 67). In this discussion, we will focus on the reasons why insects are the most diverse. This paper will also focus on the limitations of these diverse species.
Elipura is made up of collembola and Protura. The diplura is closely related to the insecta class. However, research indicates that crustaceans closely resemble insects than the entognatha class. Further research indicates that the collembolla have a different origin from the insects.
The first evidence of Hexapods dates back to the Devonian period (Approximately 390 years ago). During this time, the insects are said to have been wingless. However, the preservation of the fossils was poor due to their exoskeleton, which is made of chitin. The evolution of the wings was an adaptation to allow them to survive the harsh conditions of the terrain. Insect fossils believed to have been from the Devonian period have been described. The oldest is a precursor of Rhyniella Praecusor found in Scotland. Primitive rooted plants of the time were localised in moist areas, and hence created soil for early arthropods such as myriapods (Grimaldi & Engel 66). Today, majority of the insects are terrestrial with a few in the marine habitat.
The figures described in the previous slide are only representative of the species that have been documented. Forecasting shows that there could be many more species of insects living in non accessible areas that have not been scientifically described. To be recognized, insect species have to be described scientifically. This involves publishing of their description in the specialist journals. This is followed by thorough research. The purpose of this is to describe the insect, as well as classify it depending on it features.
New species are recognised after formal descriptions. In Borneo, for the decade 1994-2004, 361 new species were found. 260 ...Download file to see next pagesRead More
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