| 释义 |
petasma Zool.|pɛˈtæzmə|
[a. Gr. πέτασµα something spread out.]
In prawns of the family Penæidea, a membranous appendage attached to the first pair of pleopods.
1888C. S. Bate in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXIV. 230 The pleopods [of Penæus] are large and powerful, terminatng in two foliaceous branches in every pair except the first, which in the male carries attached to the base a large membranous appendage that I call ‘petasma’. 1909A. E. Shipley in A. Sedgwick Student's Text-bk. Zool. III. v. 527 In Penæus, Leucifer and Sergestes a lobe projects inwards from the base of the first pleopods in the male, and may unite with its fellow to form the petasma (or curtain). 1966McGraw-Hill Encycl. Sci. & Technol. V. 105/1 The male [genital] system [of Eumalocostraca] consists of the testis, vas deferens, ductus ejaculatorius, and sometimes a penis, modified thoracic limbs (pleopods), or petasma. |