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1

Structure and ultrastructure of the egg capsule of Thermobia domestica (Packard) (Insecta, Zygentoma)

100%
Poprawa I., Rost M. M.
Folia Biologica
|
2004
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vol. 52
|
issue 3-4
185-190
EN
Eggs of Thermobia domestica (Packard) were collected from a laboratory culture. They were prepared for analysis in light and electron microscopes (TEM, SEM). A few hours after oviposition the egg capsule starts to tarnish and changes its colour to brown. Polygonic shapes on its surface can be seen. The egg capsule consists of a thin vitelline envelope and the chorion. The chorion consists of a one-layered endochorion and a three-layered exochorion. There are minor and major mushroom-like structures placed on the surface of the chorion. Their function is proposed. One micropyle is observed on the anterior pole of the egg. The micropylar opening is formed on the process of a follicular cell.
2

Ultrastructural studies on the formation of egg envelopes in fulgoromorphans (Insecta, Hemiptera, Fulgoromorpha: Dictyopharidae)

100%
Pyka-Foscik G., Jankowska W., Szklarzewicz T.
Folia Biologica
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2003
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vol. 51
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issue 3-4
171-179
EN
Follicular cells in ecuadorian dictyopharids diversify into two subpopulations: the main body cells (MFs) and cells surrounding the anterior pole of the oocyte (AFs). The synthetic activity of both categories of follicular cells is manifested by the presence of numerous cisternae of rough endoplasmic reticulum, Golgi complexes and vacuoles containing electron-dense material in their cytoplasm. The MFs synthesize precursors of the main body chorion, whereas the AFs are responsible for the formation of micropylar apparatus and respiratory tubules. The main body chorion is composed of thin endochorion and exochorion which forms pillar-like projections.
3

A characterization of the egg capsules of Anacroneuria starki and A. talamanca (Plecoptera: Perlidae), with a suggestion about the distribution of stoneflies in the tropics

88%
Fenoglio S., Rosciszewska E.
Folia Biologica
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2003
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vol. 51
|
issue 3-4
159-164
EN
In this study, the structure of egg capsules of two species of Neotropical Perlidae: Anacroneuria starki FENOGLIO and MORISI (2001a) and A. talamanca STARK (1998), were examined. Eggs were studied using a scanning electron microscope. A morphological characterization of these eggshells is presented: layers, attachment structures and other anatomical features are described. The egg capsules of the two species differ in some aspects, but both are characterized by thin-layered egg coverings (vitelline envelope, chorion and extrachorion). On the basis of these observations, the importance of eggshell structure for the biogeographical distribution of Plecoptera in the tropics is discussed. A key role for egg capsules in the adaptation process of Plecoptera to aquatic environments of the Neotropics is hypothesized.
4

Structure of ovaries and formation of egg envelopes in the stonefly, Leuctra autumnalis Aubert, 1948 (Plecoptera: Leuctridae). Ultrastructural studies

88%
Poprawa I., Baran A., Rosciszewska E.
Folia Biologica
|
2002
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vol. 50
|
issue 1-2
29-38
EN
The investigation of ovaries and the formation of egg envelopes of the stonefly Leuctra autumnalis was carried out with light and transmission electron microscopes. The ovary of the studied species is paired and consists of several dozen panoistic ovarioles opening individually to the oviduct. The process of egg capsule formation already begins in previtellogenesis. At this time the follicular cells secrete precursors of the vitelline envelope. Analysis of the presented data suggests that the oocyte itself also takes part in the formation of the vitelline envelope during late vitellogenesis. Simultaneously, the follicular cells produce precursors of further layers of the egg capsule, i.e. two-layered chorion and extrachorion, consisting of two gelatinous layers and a flocculent one. The completely developed capsule contains channels, probably micropylar ones.
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