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Approximately 20 % of developing embryos on the pleopods of 3 brooding female grass shrimp Palaemon (Exopalaemon) onentis Holthuis (Crustacea Decapoda), collected from a penaeid shnmp culture facility in Taiwan, were found by histologic exammation to possess lesions with neoplastic characteristics. Affected embryos displayed marked disorganization of embryonic tissues, and possessed undifferentlated, primitive, pleomorphic cells that typically had hypertrophied nuclei w t h one or more prominent nucleoh. Cell division in the affected embryos was common, with bipolar, tripolar, and bizarre multipolar mitotic figures present in many of the neoplastic lesions Because the lesions were unbfferentiated and presumably originated prior to gastrulation from ectoderm progenitors, the neoplastic lesions are considered to be an embryonal carcinoma

Embryonal carcinoma of developing embryos of grass shrimp Palaemon orientis (Crustacea: Decapoda)