By Pisuth Ek-Amnuay
The beetles, participants of the Order Coleoptera are the biggest order of bugs, with approximately forty % of identified species of overall insect international or approximately 400,000 species. My first variation of this ebook used to be released in 2002 and used to be additionally the 1st booklet of beetles on hand in Thailand. it is a revised version, emphasizing the species content material and risk of extra species for all these beetle households, this variation includes 509 species compared to the 1st version which incorporated merely 362 species and subspecies.
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The foregoing remarks appear to apply to the case of the Mollusca, which, at a very early period, had reached a high organization and a great development of forms and species in the testaceous Cephalopoda. In each succeeding age modified species and genera replaced the former ones which had become extinct, and as we approach the present ssra, but few and small representatives of the group remain, while the Gasteropods and Bivalves have acquired an immense preponderance. In the long series of changes the earth has undergone, the process of peopling it with organic beino-s has THE INTRODUCTION OF NEW SPECIES.
A wild animal has to search, and often to labour, for every mouthful of food—to exercise sight, hearing, and smell in seeking it, and in avoiding dangers, in procuring shelter from the inclemency of the seasons, and in providing for the subsistence and safety of its offspring. There is no muscle of its body that is not called into daily and hourly activity; there is no sense or faculty that is INDEFINITELY FBOM THE ORIGINAL TYPE. 39 not strengthened by continual exercise. The domestic animal, on the other hand, has food provided for it, is sheltered, and often confined, to guard it against the vicissitudes of the}, seasons, is carefully secured from the attacks of its natural enemies, and seldom even rears its young without human assistance- Half of its senses and faculties become quite useless, and the other half are but occasionally called into feeble exercise, while even its muscular system is only irregularly brought into action.
Now it is believed the present hypothesis will harmonize with all these facts, and in a great measure serve to explain them ; for though it may appear to some readers essentially a theory of progression, it is in reality only one of gradual change. It is, however, by no means difficult to show that a real progression in the scale of organization is perfectly consistent with all the appearances, and even with apparent retrogression, should such occur. Eeturning to the analogy of a branching tree, as the best mode of representing the natural arrangement of species and their successive creation, let us suppose that at an early geological epoch any group (say a class of the Mollusca) has attained to a great richness of species and a high organization.