(23 °C)
a,
a 2
a 3
b
Cj
c 2
Normal cleavage
Pseudo- cleavage
Anatrepsis
Katatrepsis without embryo
FIG. 7. Analysis of cleavage and blastokinesis in Gryllus domesticus L. (Saltatoria)
(from Mahr, 1960, 1961). Scale: Percentage of egg length (total length, 20-2-6 mm). Eggs
seen from the left side. Normal cleavage (a x _ 3 ) and formation of plasma islands (IS) in
pseudo-cleavage (b, c) begin in the cleavage centre (CC) indicated by curve in the axial
strand (a x ). Activation centre (AC) preformed invisibly behind the 14% level is demonstrated by suppression of germ anläge following ligature (f-h). Defects (D^Dg) indicate
ooplasm movements (d-e). Abbreviations: D, defective ooplasm; E, cleavage energid; GA,
germ anläge; IS, plasmic island without nucleus; N, egg nucleus; PB, polar body; SER
serosa; YC, yolk cell. Other abbreviations as in Fig. 3. Further explanations in the text
(Sections V fc B, VI).
a,
a 2
a 3
b
Cj
c 2
Normal cleavage
Pseudo- cleavage
Anatrepsis
Katatrepsis without embryo
FIG. 7. Analysis of cleavage and blastokinesis in Gryllus domesticus L. (Saltatoria)
(from Mahr, 1960, 1961). Scale: Percentage of egg length (total length, 20-2-6 mm). Eggs
seen from the left side. Normal cleavage (a x _ 3 ) and formation of plasma islands (IS) in
pseudo-cleavage (b, c) begin in the cleavage centre (CC) indicated by curve in the axial
strand (a x ). Activation centre (AC) preformed invisibly behind the 14% level is demonstrated by suppression of germ anläge following ligature (f-h). Defects (D^Dg) indicate
ooplasm movements (d-e). Abbreviations: D, defective ooplasm; E, cleavage energid; GA,
germ anläge; IS, plasmic island without nucleus; N, egg nucleus; PB, polar body; SER
serosa; YC, yolk cell. Other abbreviations as in Fig. 3. Further explanations in the text
(Sections V fc B, VI).