The embryonic development of the cnidarian Hydractinia echinata. Issue 6 (23rd October 2014)

• Record Type: Journal Article
• Authors: Kraus, Yulia; Flici, Hakima; Hensel, Katrin; Plickert, Günter; Leitz, Thomas; Frank, Uri
• Is Part Of: Evolution & development. Volume 16:Issue 6(2014)
• Page Start: 323
• Page End: 338
• Publication Date: 2014-10-23
• Subjects: Evolution (Biology) -- Periodicals; Developmental biology -- Periodicals; 576.82
• DOI: 10.1111/ede.12100
• Languages: English
• ISSNs: 1520-541X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>SUMMARY</title> <sec id="ede12100-sec-0001" sec-type="section"> <p>With the rapid increase of the quantity of molecular data, many animals joined the ranks of the so‐called 'emerging models' of Evo‐Devo. One of the necessary steps in converting an emerging model into an established one is gaining comprehensive knowledge of its normal embryonic development. The marine colonial hydrozoan <italic>Hydractinia echinata</italic> – an excellent model for research on stem cells, metamorphosis, and allorecognition – has been studied for decades. Yet knowledge of its embryonic development remains fragmentary and incomplete. Here we provide a detailed account of <italic>H. echinata</italic> embryonic development using in vivo observations, histology, immunohistochemistry, and electron microscopy. Furthermore, we propose a model describing the cellular basis of the morphogenetic movements occurring during development and also reveal a functional link between canonical Wnt signaling and regional differences in the morphology of the embryo. <italic>Hydractinia</italic> embryogenesis is an example of the diversity and plasticity of hydrozoan development where multiple routes lead to the same result – the formation of a normal planula larva.</p> </sec> </abstract>