Die Embryonalentwicklung der Paradiesschnecke ... - TOBIAS-lib

Kapitel 2
Fig. 2: M. cornuarietis, 3-day-old embryos; A: control embryo in Stage VII, left lateral
view (from Osterauer et al., Evol Dev, 2010, 12, 474–443, c○Wiley-Blackwell, reproduced
by permission); B: histological transverse section of a control embryo, plane of section indicated
by dashed line in sketch (left lateral view); C: Pt-exposed embryo, left lateral view;
and D: histological transverse section of a Pt-exposed embryo, plane of section indicated
by dashed line in sketch (left lateral view). anp, anal cell-plate; cn, ctenidium; f, foot;
h, head; m, mouth; mte, mantle edge; pt, prototroch; sh, shell; shg, shell gland; shgr,
rudimentary shell gland; vs, visceral sac. [Color figure can be viewed in the online issue,
which is available at wileyonlinelibrary.com.]
ter the initial steps of evagination. Subsequently, the rudimentary shell gland
does not evaginate further but invaginates into the body of the animals.
Figure 3B,D shows horizontal sections of embryos from both control and
Pt-exposed groups. In both embryos, the anus can be recognized on the
right side of the visceral sac. In the control, the visceral sac is covered by
the mantle anlage, which, in turn, is covered by the shell. In the embryo
from the platinum group, the mantle anlage has stopped growing and does
not cover the visceral sac.
Comparing the horizontal sections in Figure 4A (control) and B (platinum
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