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INSECT OOGENESIS WITH AND WITHOUT LAMPBRUSH CHROMOSOMES K.
BIER, W. KUNZ and D. RIBBERT 1. PANOISTIC AND MEROISTIC OVARIES The
pattern of oogenesis in insects is very variable. There is a variety in both the ...
2
Developmental Plasticity and Evolution
Fig. 19.11. The three major types of insect ovaries: (a) panoistic, (b) polytrophic,
and (c) telotrophic, showing germaria (g), immature oocytes (ol, mature oocytes (
o'l, nutritive (nurse) cells (n), remains of depleted nurse cells (n'), and follicular ...
Mary Jane West-Eberhard,
2003
3
Insect Ecology: An Ecosystem Approach
(A) Panoistic ovary of an apterygote insect, Lepisma saccharina. G, germarium;
FC, follicle cell. (Reprinted from R. C. King and J. Büning, 1985. The origin and
functioning of insect oocytes and nurse cells. In “Comprehensive Insect
Physiology, ...
Timothy D. Schowalter,
2006
4
The Insects: Structure and Function
As a result, the oocytes in meroistic ovarioles have much larger amounts of
euplasm than those in panoistic ovarioles. This has important consequences for
the development of the embryo (Section 14.2). Rapid synthesis of euplasmic ...
R. F. Chapman, Stephen J. Simpson, Angela E. Douglas,
2013
5
The Insect Ovary: Ultrastructure, Previtellogenic Growth and ...
3.5.1 Panoistic ovaries (a) Orders without cluster formation The majority of
ancient insect groups built their eggs through the panoistic pathway (Figure 3.88)
. We will first focus on those orders in which cystoblast mitoses of the female
pathway ...
6
Chemoecology of Insect Eggs and Egg Deposition
Panoistic. and. Meroistic. Ovarioles. In insects, the germ cells that receive the
information necessary for the continuation of life arise from pole cells that
segregate from the rest of the single cell layered embryo very early in
development.
Monika Hilker, Torsten Meiners,
2008
The distribution of ovariole types among various insect orders suggest that: ( 1 )
polytrophic merois- tic ovaries evolved twice from the panoistic ones, once in
Entognatha s. str. (STYS & BlLINSKI 1 990; BlLINSKI 1 993 ), and once in the ...
Ovarioles of L. autumnalis are panoistic, which indicates that all oogonia in
germarium become oocytes. These, along with surrounding somatic cells, move
to vitellarium forming consecutive ovarian follicles. It is noteworthy, however, that
in ...
9
Physiological Systems in Insects
This differs from panoistic ovarioles, where the oocyte selectively amplifies its
own rRNA. Drosophila nurse cells reach a ploidy of 1024–2048n with the
transcriptional potential of 5000 panoistic oocytes, allowing for a much more
rapid ...
10
Evolutionary Developmental Biology
A. The panoistic oocyte, which is surrounded by follicle cells but lacks nurse cells,
is typical of insects such as Schistocerca. B. A meroistic oocyte, also surrounded
by follicle cells, except anteriorly, where nurse cells are present, is typical of ...