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The Indian tropical tasar silk insect, Antheraea paphia Linn. (Lepidoptera : Saturniidae) is a natural fauna of torrid zone of India. The population of ecorace Sarihan of A. paphia is endemic to Santhal Pargana district of Jharkhand. The present study deals with structural diversification in economic characters of cocoon in natural population of ecorace Sarihan of A. paphia. The nature grown cocoons of ecorace Sarihan were collected from Santhal Pargana district of Jharkhand during March-April 2020. Data on various cocoon associates for each sex were recorded and computed for the descriptive statistics for the different traits of both the sexes. Single cocoon reeling parameters such as length of single filament, weight of single filament, non-breakable filament length and denier of single filament were evaluated to confer the vested quality of silk yarn produced by the ecorace Sarihan. The male and female population of ecorace Sarihan of A. paphia elicited significant difference in their traits adjudicated structural diversification in the length, thicknesses, longitudinal, horizontal circumferences, longitudinal-horizontal circumference ratio, length, breadth, length-breadth ratio of cocoons, cocoon weight, pupa weight, shell weight and Shell percent except for diameter of peduncle ring diameter. The existed structural diversity with the fairly well associated traits can be utilized in selection for systematic breeding program and conservation of the wild population.
Structural diversification, cocoon, silk, Ecorace Sarihan, Antheraea paphia, Santhal paragana
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