Gastrulation in the spider Zygiella x‐notata involves three distinct phases of cell internalization

The cell movements of gastrulation were analyzed in embryos of the spider Zygiella x‐notata, using time‐lapse video, cell tracing, and improved histology. Cells are internalized near the center of the germ disc in three distinct phases. First, cumulus mesenchyme cells ingress and migrate as a group...

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Bibliographic Details
Published in:Developmental dynamics 2007-12, Vol.236 (12), p.3484-3495
Main Authors: Chaw, R. Crystal, Vance, Emily, Black, Steven D.
Format: Article
Language:English
Subjects:
Animals
arachnid
Araneae
arthropod
Body Patterning
Cell Movement
chelicerate
Gastrulation
morphogenesis
Species Specificity
spider
Spiders - cytology
Spiders - embryology
Time Factors
Zygiella x-notata
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Summary:The cell movements of gastrulation were analyzed in embryos of the spider Zygiella x‐notata, using time‐lapse video, cell tracing, and improved histology. Cells are internalized near the center of the germ disc in three distinct phases. First, cumulus mesenchyme cells ingress and migrate as a group beneath the superficial layer. Second, mass internalization through a blastopore yields a diffusely organized deep layer. Third, superficial cells accumulate at the center of the germ disc to form the caudal bud. The floor is internalized, and the caudal bud moves over the nascent dorsal field to form the caudal lobe. This pattern of gastrulation differs from the canonical pattern described in the historical literature: (1) the cumulus of Z. x‐notata is completely formed before any other cells internalize; and (2) the caudal lobe is formed by means of the caudal bud, which is a locus of cell internalization. Developmental Dynamics 236:3484–3495, 2007. © 2007 Wiley‐Liss, Inc.
ISSN:1058-8388
1097-0177
DOI:10.1002/dvdy.21371