NDLI: Cleavage and gastrulation in Pycnogonum litorale (Arthropoda, Pycnogonida): morphological support for the Ecdysozoa?

Content Provider	Springer Nature Link
Author	Ungerer, Petra Scholtz, Gerhard
Copyright Year	2009
Abstract	The early cleavage and gastrulation of the pycnogonid Pycnogonum litorale is investigated in detail by fluorescence microscopy, confocal laser scanning microscopy, and histology. The cleavage is holoblastic with equally sized blastomeres and an irregular radial pattern. There is no stereotypic cell lineage, and timing and spindle directions of individual mitoses vary to a high degree. Gastrulation begins at the 63-cell stage with the retardation and enlargement of a cell which adopts the form of a bottle and fills the interior of the egg, followed by immigration and epiboly of smaller cells surrounding the large bottle-shaped cell. The gastrulation site marks the dorsal side of the embryo and the stomodaeum forms adjacent to the area of gastrulation. The pattern of the early development of Pycnogonum is compared with that of other Pycnogonida resulting in a putative ground pattern of pycnogonid development. Furthermore, our results are discussed in the wider framework of putative arthropod and cycloneuralian relationships. This comparison implies morphological support for the Ecdysozoa.
Starting Page	263
Ending Page	274
Page Count	12
File Format	PDF
ISSN	0720213X
Journal	Zoomorphology
Volume Number	128
Issue Number	3
e-ISSN	1432234X
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-04-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cell lineage Articulata Spiral cleavage Germ layers Evolution Animal Systematics/Taxonomy/Biogeography Evolutionary Biology Developmental Biology Animal Anatomy / Morphology / Histology
Content Type	Text
Resource Type	Article
Subject	Developmental Biology Animal Science and Zoology

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