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Plurinational shape (Polymorphism) is a condition in a population of organisms of the same species. With appearance (Phenotype) are different from 2 or more characteristics. A plurinational shape may affect the life of the organism in a different format, such as a color and pattern, with a variety and colors that blend with the surface of the environment at the same time may help in the hunt for patients (Camouflage) is a Visual predator visible blurry. Apostatic selection is a theory again by the predators to select victims that resembles a Common pattern for this style, it likely will be hunted by predators. Therefore, the static model of plurinational shape of color and pattern, it is important for the survival of the population. In this study, the study of the variety, quantity and proportion of single cover shell pattern type C. oualaniensis sloping Hay — tide Hat tha Wang. Koh sichang, Chonburi province by collecting samples during a midday minimum water and at night. The conversion will be made to keep all 3 sample conversion extraction, pattern, number and size of the shells found. Recording characteristics of the surface, i.e. a surface type and color of the surface to study the relationship of patterned shells with the characteristics of the surface in daytime and night time. The study results Single cover shell found type C. oualaniensis total number of 14 designs by daytime find all 13 patterns, the most common patterns are tongues, few Black with Axial and Tiger pattern, respectively, and in the night I found all 12 patterns, the most common patterns are tongues, with numerous Axial Axial with few tongues and Tiger pattern, respectively. This is the color of the shells found there may be a relationship with the characteristics of the surface in the residential area. The color of shells could be harmonized with the color of the surface to sleep at the same time an escape from predators.
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