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Kapitel 2 veloped further: the foot is clearly formed, and the tentacles have started budding. These criteria correspond to what could be expected for a control embryo in Demian and Yousif ’s Stage IX. This resemblance, however, does not include the visceral sac. The mantle anlage seems to have enlarged but not enough to cover a significant part of the visceral sac. Furthermore, it is still positioned in its initial position on the ventro-lateral side of the visceral sac, where a cap-like shell can now be seen. A horizontal, anticlockwise rotation of the visceral sac still does not occur. Fig. 5: M. cornuarietis, 5-day-old embryos; A: control embryo in Stage X, left lateral view (from Osterauer et al., Evol Dev, 2010, 12, 474–443, c○Wiley-Blackwell, reproduced by permission); B: histological horizontal section of a control embryo, plane of section indicated by dashed line in sketch (left lateral view), HE-staining; C: Pt-exposed embryo, left lateral view; and D: histological horizontal section of a Pt-exposed embryo, plane of section indicated by dashed line in sketch (left lateral view), HE-staining. an, anus; cn, ctenidium; e, eye; f, foot; h, head; i, intestine; ls, larval stomach; m, mouth; mtc, mantle cavity; mte, mantle edge; oe, oesophagus; op, operculum; sh, shell; shg, shell gland; tn, tentacle; vs, visceral sac. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.] 66
Kapitel 2 Seven-day-old embryos At the age of 7 days, the embryos from the control almost completely resemble adult snails in shape (Fig. 6A). The tissue covering the dorsal side of the visceral sac usually forms the lining of the mantle cavity, whereas the tissue on its ventral side, the mantle anlage under the shell, covers the visceral sac. In contrast to this conventional anatomy, Figure 6B shows a sagittal section of the visceral sac of a Pt-exposed embryo. The distal parts of the mantle edge and shell gland shown in Figure 6B (Pt-exposed) correspond to the parts of the mantle edge and shell gland that are located above the head in controls (Fig. 6A). The proximal part of the shell gland in Pt-exposed animals (Fig. 6B) is found at exactly the same position right above the foot as in controls (Fig. 6A). Fig. 6: M. cornuarietis, 7-day-old embryos, asterisks indicate corresponding structures; A: control embryo, sagittal section, plane of section indicated by dashed lines in sketch (left lateral view), HE-staining and B: Pt-exposed embryo, sagittal section through the visceral sac and foot; detail and plane of section indicated by dashed lines in sketch (left lateral view), methylene blue staining. cn, ctenidium; f, foot; h, head; ls, larval stomach; mtc, mantle cavity; mte, mantle edge; oe, oesophagus; op, operculum; sh, shell; shg, shell gland; vs, visceral sac. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.] Nine-day-old embryos Figure 7A shows the shell of a 9-day-old control embryo. The soft tissue is not visible here, because the animal is completely retracted into its shell in response to the fixation procedure. In Figure 7B, a transverse section 67
Page 1 and 2:
Die Embryonalentwicklung der Paradi
Page 3 and 4:
Inhaltsverzeichnis Zusammenfassung
Page 5 and 6:
Zusammenfassung Hintergrund und Zie
Page 7 and 8:
Hintergrund und Zielsetzung der Arb
Page 9 and 10:
Hintergrund und Zielsetzung der Arb
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Material und Methoden Marisa cornua
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Material und Methoden Hälterung Di
Page 15 and 16:
Material und Methoden lindividuen a
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Ergebnisse lung von Marisa cornuari
Page 19 and 20: Ergebnisse Kapitel 3: Marschner, L.
Page 21 and 22: Ergebnisse Wachstum des Columellamu
Page 23 and 24: Diskussion Naticidae) entwickelt si
Page 25 and 26: Diskussion engrailed und dpp-BMP2/4
Page 27 and 28: Diskussion Abb. 4: Vergleich der mi
Page 29 and 30: Schlussfolgerung perimentell zu unt
Page 31 and 32: Literatur Engelhardt, W. (2008). Wa
Page 33 and 34: Literatur Ponder, W. F. und Lindber
Page 35 and 36: Kapitel 1:Turning snails into slugs
Page 37 and 38: Kapitel 1 dae). Their ontogeny also
Page 39 and 40: Kapitel 1 Exposure experiments Test
Page 41 and 42: Kapitel 1 et al. (2001, 2003) or wi
Page 43 and 44: Kapitel 1 for 4 × 5 min with PTw (
Page 45 and 46: Kapitel 1 treatment 29.9 ± 32.78%
Page 47 and 48: Kapitel 1 Fig. 2 3 : Images of M. c
Page 49 and 50: Kapitel 1 Fig. 4 4 : Location of th
Page 51 and 52: Kapitel 1 internal solid circular s
Page 53 and 54: Kapitel 1 ietis as it was shown for
Page 55 and 56: Kapitel 1 Burnett, L.E., Woodson, P
Page 57 and 58: Kapitel 1 Page, L.R., 2002. Ontogen
Page 59 and 60: Kapitel 2: Arresting mantle formati
Page 61 and 62: Kapitel 2 tropods (Crofts, 1937, su
Page 63 and 64: Kapitel 2 Scanning electron microsc
Page 65 and 66: Kapitel 2 called “mantle anlage
Page 67 and 68: Kapitel 2 Fig. 2: M. cornuarietis,
Page 69: Kapitel 2 and the visceral sac rema
Page 73 and 74: Kapitel 2 Fig. 7: M. cornuarietis,
Page 75 and 76: Kapitel 2 gation of internal shells
Page 77 and 78: Kapitel 2 first tended to invaginat
Page 79 and 80: Kapitel 2 side of the visceral sac
Page 81 and 82: Kapitel 2 cornuarietis (Mesogastrop
Page 83 and 84: Kapitel 3: External and internal sh
Page 85 and 86: Kapitel 3 during embryonic developm
Page 87 and 88: Kapitel 3 Differential growth of ma
Page 89 and 90: Kapitel 3 sac, facing away from the
Page 91 and 92: Kapitel 3 Fig. 4 9 : SEM-images of
Page 93 and 94: Kapitel 3 Fig. 6: Histological sect
Page 95 and 96: Kapitel 3 side of the visceral sac
Page 97 and 98: Kapitel 3 different mechanism that
Page 99 and 100: Kapitel 3 whether the inhibition of
Page 101 and 102: Kapitel 3 tinuum of gradual morphol
Page 103 and 104: Kapitel 3 served one. However, ther
Page 105 and 106: Kapitel 3 hand and modified in Inks
Page 107 and 108: Kapitel 3 ticipated in designing th
Page 109 and 110: Kapitel 3 Demian, E. S. and Yousif,
Page 111 and 112: Kapitel 3 Page, L. R. (2003). Gastr
Page 113 and 114: Kapitel 4 Herewith, we were able to
Page 115 and 116: Kapitel 4 Histology and 3D reconstr
Page 117 and 118: Kapitel 4 72 or 96 hours at 6 ◦ C
Page 119 and 120: Kapitel 4 tioned on the ventral sid
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Kapitel 4 P2 does not curve backwar
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Kapitel 4 which this nerve is attac
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Kapitel 4 Fig. 5 13 : 3D reconstruc
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Kapitel 4 system in which the right
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Kapitel 4 ready present during tors
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Kapitel 4 Haydon, P. G., McCobb, D.
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Kapitel 5: Quantifikation der Hsp70
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Kapitel 5 Die Gesamtproteinmenge wu
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Kapitel 5 steigt mit steigendem pro
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Kapitel 5 Piano, A., Valbonesi, P.,
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Publikationsliste • Marschner, L.
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