THE LIFE-CYCLE OF PELTOGASTERELLA (CIRRIPEDIA, RHIZOCEPHALA) 1) BY RYUZO YANAGIMACHI Zoological Institute, Hokkaido University, Sapporo, Japan All the known Rhizocephala except a few species belonging to the family Sylonidae have been described as hermaphroditic animals. In 1958, Ichikawa and Yanagimachi reported that Peltogasterella gracilis ( Boschma ) ( syn. Peltoga.rterella .rociali.r Kruger; cf. Reischman, 1959) is not a hermaphrodite, but is structurally a female. The "testes" of this rhizocephalan are actually female organs which function as a reservoir to hold the cells of the larval cypris male. Ichikawa and Yanagimachi suggested that the "testes" should be called "spermathecae" (Ichika- wa and Yanagimachi, 1958 ) or "cypris-cell receptacles" (Ichikawa and Yanagi- machi, 1960 ) . Recently, the following facts have been elucidated in Peltoga.rterella gracili.r: (1) An adult female produces exclusively either large eggs (160-170 p. in diam- eter) or small eggs (140-150 1-t in diameter). Females on a single host-crab are uniformly either "large-egg-producing" or "small-egg-producing." (2) The large eggs develop into large larvae, while the smaller eggs develop into small larvae. In the nauplius stage, the two types of the larvae are distinguishable only by their size. In the cypris stage, however, the larvae differ not only
Crustaceana – Brill
Published: Jan 1, 1961
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