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HISTOLOGY OF THE MALE REPRODUCTIVE SYSTEM AND MORPHOMETRY OF CELL POPULATION OF THE TESTICULAR FOLLICLES OF CHROMACRIS SPECIOSA (THUNBERG, 1824) (ORTHOPTERA: ROMALEIDAE) SUBMITTED TO THREE PHOTOPERIODS

ABSTRACT

The research aimed to study the histology of ovaries, lateral oviducts, common oviducts and spermatheca, and morphometry of the ovaries of Tropidacris collaris (Stoll, 1813) (Orthoptera: Romaleidae), reared under the photoperiods 10:14, 12:12 and 14:10 (L:D). Morphometry was conducted using a binocular magnifying glass adapted with a milimetric ocular, being registered the length and the width of the ovaries. Subsequently the ovarioles were separated and counted. For the histological analysis, the organs were fixated in alcoholic Boüin, included in “paraplast” and stained by H.E., Mallory’s trichromic and P.A.S. Photoperiods studied did not influence the morphometry of the ovaries, number of ovarioles and the histology of the organs. The averages of the ovarioles number were of 195,62, 202,62 and 208,25 for the fotoperíodos of 10L:14D, 12L:12D and 14L:10D, respectively, being more numerous in the left-side ovary. Each ovarioles presented tubular morphology with distinct regions (terminal filament, germarium and vitellarium). The lateral oviducts are internally covered by simple cubic epithelial tissue with numerous folds, sustained on the connective tissue and, externally, by a striated muscular tissue layer. The common oviduct presents the same histological constitution of the lateral oviduct, except by the presence of the epithelium with cuticular intima and a well developed muscular layer. The spermatheca is constituted by columnar pseudo-stratified epithelial tissue with cuticular intima and striated muscular tissue associated to connective tissue.

KEY WORDS
Grasshopper; morphology; reproduction; spermatogenesis; photoperiods

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