NDLI: Cleavage and gastrulation of the euphausiacean Meganyctiphanes norvegica (Crustacea, Malacostraca)

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Musculature and nervous system of Gnathostomula peregrina (Gnathostomulida) shown by phalloidin labeling, immunohistochemistry, and cLSM, and their phylogenetic significance

Zoomorphology : Volume 123, Issue 2, May 2004

Zoomorphology : Volume 123, Issue 1, February 2004

Zoomorphology : Volume 122

Zoomorphology : Volume 121

Zoomorphology : Volume 120

Zoomorphology : Volume 119

Zoomorphology : Volume 118

Zoomorphology : Volume 117

Cleavage and gastrulation of the euphausiacean Meganyctiphanes norvegica (Crustacea, Malacostraca)

Content Provider	Springer Nature Link
Author	Alwes, Frederike Scholtz, Gerhard
Copyright Year	2004
Abstract	According to the ‘Articulata’ hypothesis the cleavage of arthropods must be derived from spiral cleavage. However, arthropods show a great variety of cleavage modes with a widespread occurrence of superficial cleavage. In the Malacostraca, holoblastic cleavage occurs in some taxa such as Amphipoda, Euphausiacea and Dendrobranchiata. In particular, the cleavage of euphausiaceans has been proposed to be a modified spiral cleavage. The cell lineage of early stages up to blastoderm formation of the euphausiacean Meganyctiphanes norvegica is reconstructed using recent methods of fluorescent staining. Only the oblique angle of the mitotic spindles during the transition from the 2- to the 4-cell stage resembles the spiral cleavage mode. At the 8-cell stage, four cells each form a pattern of two interlocking bands which is preserved until the 122-cell stage. One blastomere is delayed in division and shows an oblique division from the fourth cleavage on. It is the precursor cell of two enlarged and cleavage-arrested cells at the 32-cell stage. At the 62-cell stage, these two cells are surrounded by eight cells following a specific cell division pattern during the subsequent division cycles. The cleavage pattern of M. norvegica occurs in two mirror images. A comparative approach reveals distinct similarities between the early cleavage patterns of Euphausiacea and Dendrobranchiata which are suggested to be homologous. Furthermore, the relationships to non-malacostracan cleavage patterns are discussed. It is shown that the early cleavage pattern of M. norvegica does not offer an example of a spiral cleavage within arthropods.
Starting Page	125
Ending Page	137
Page Count	13
File Format	PDF
ISSN	0720213X
Journal	Zoomorphology
Volume Number	123
Issue Number	3
e-ISSN	1432234X
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-03-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cell lineage Arthropods Spiral cleavage Articulata Ecdysozoa
Content Type	Text
Resource Type	Article
Subject	Developmental Biology Animal Science and Zoology

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