Abstract
This study was conducted to assess the morphology of eggs and histology of the ovaries in female Isophya nervosa Ramme, 1931 (Orthoptera: Tettigoniidae). While the egg morphology of I. nervosa was studied and examined by a stereomicroscope, a light microscope, and a scanning electron microscope, respectively, the morphology and histology of the ovary of this species were studied and examined by a stereomicroscope, a light microscope, a scanning electron microscope, and a transmission electron microscope, respectively. We found that the adult female had two pairs of ovaries, lateral oviduct, common oviduct, and spermatheca. Morphological study of the ovariole revealed that it is categorized under panoistic type of ovariole which is divided into three regions, the terminal filament, the germarium, and the vitellarium. We also observed that the eggs in I. nervosa have an ellipsoidal shape and are brown in color. Three different layers such as extrachorion, exochorion, and endochorion were observed. When the egg morphology is examined, it is understood that the surface pattern of the egg and the features of the micropylar areas may be distinguishing characters at the subfamily level, in addition to known classical taxonomic characters.
Highlights
This study aimed to illuminate the ovariole structure of I. nervosa, which is a part of the female reproductive system, to indicate the changes that occur in the follicle development, and to reveal the characteristics of the mature egg
Individuals of I. nervosa were maintained in the laboratory at temperatures ranging from 20 to 25°C for approximately one week before dissections
The general anatomy of the female reproductive system in I. nervosa consists of a pair of ovaries, the lateral oviducts to which the ovaries are attached, the common oviduct, and the spermatheca (Figs. 1a–1c) at the level of the two to six abdominal segments
Summary
Orthopteran species are one of the groups with great taxonomic diversity They are considered as a marker group in biogeographical studies (Çıplak, 2004; Chobanov et al, 2017). We know that apart from the qualitative and quantitative distinction of taxonomic characters, the classification may be made by examining different characteristics such as internal and external morphology. Based on this idea, this study aimed to illuminate the ovariole structure of I. nervosa, which is a part of the female reproductive system, to indicate the changes that occur in the follicle development, and to reveal the characteristics of the mature egg
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