ウシエビの外部生殖器の発達

概要

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There is a linear relationship between the size of the prawn and that of its petasma or thelycum as shown in Fig. 7. When the male reaches approximately 34mm in CL, the petasma is structurally complete in the great majority of specimens and is functional as intromittent organ*. In female P. monodon, the thelycum is structurally complete in almost all animals of 47mm in CL. According to the senior authors own observation, a similar size gap between the sexes mentioned above seems to be common to the other species of the genus Penaeus, but no data has yet been published. TUMA1) divided penaeid thelyca into two general types, viz. open and closed types. The present study shows that the thelycum of P. monodon belongs to the closed type. The appendix masculina of the present material is morphologically quite identical to the classification of these of the genus Penaeus presented by YOUOYA, 7) viz. anterior surface of the basal plate without strong elevation, appendage with marginal setae, and appendage longer than broad.
公益社団法人日本水産学会の論文