THE SPERMATOZOON OF ARTHROPODA

B. Baccetti,R. Dallai,F. Rosati

Published 1970 in Journal of Cell Biology

ABSTRACT

In this paper the spermatozoon of a plecopteran and of a trichopteran is described. The former is an “orthopteroid type” spermatozoon, with the following peculiarities: acrosome lying in lateral position with respect to the nucleus; proteinaceous rodlet arising from the adjunct centriole and flanking the two mitochondrial derivatives in the tail; accessory fibers of the axial-filament complex hollow even at maturation. This spermatozoon is therefore quite different from Odonata and Ephemeroptera sperms previously described, and it represents the simplest case of structure of the outer accessory fibers known in insects. The spermatozoon of the trichopteran exhibits the following characteristics: absence of an acrosome, a third supernumerary proteinaceous slender fibril between the two principal central ones, only one mitochondrial derivative entirely occupied by parallel transverse cristae and lacking a crystalline axis. The outer accessory fibers of the flagellum are 300 A in diameter and, in this respect, closely recall those of Lepidoptera, comparatively reexamined in this paper. Like the principal central units, these fibers are filled with glycogen-like polysaccharides and proteins, and they are longer than the 9 principal peripheral doublets. This model of Trichoptera and Lepidoptera outer fibers is quite different from the pattern hitherto described in other insects.

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