Morphogenesis in colonial hydroids: Pulsating rudiment splitting

Morphogenesis in colonial hydroids: Pulsating rudiment splitting Two spatially separated processes underlie the growth and morphogenesis in hydroids (Cnidaria, Hydroidomedusa): (1) growth pulsations of the terminal growing tips and (2) cell proliferation and migration in more proximal parts of the colony soft tissues. Growing tips are morphogenetic elements of the colony that provide for the colony elongation and morphogenesis. In thecate hydroids (subclass Leptomedusae) with highly integrated colonies and monopodial shoot growth, the initiation of the lateral branches and hydranth rudiments looks like a periodic splitting of the growing tip into two or more rudiments. Published descriptions and proposed models of this process assume that the splitting results from the formation of the furrows running into the tip from its apical surface. In this study on a Sertulariidae species, we demonstrate that the visible process of the tip splitting into several rudiments begins in its proximal part. At the same time, the inner ridges are initiated at the skeleton lateral surfaces surrounding the growing tip. These ridges develop and grow along the proximodistal axis. Eventually, the opposite ridges fuse, which splits the tip into several rudiments. We propose that the tip splitting into several rudiments is impossible without the spatial regulation of the outer skeleton formation. This process explains many species-specific properties of the shoot spatial organization in thecate hydroids such as the partial or complete fusion of the zooid skeleton with the shoot stem skeleton, deflection of the distal parts of the zooid skeleton from the shoot stem axis, etc. The revealed mechanisms considerably supplements and corrects the models describing morphogenesis in colonial hydroids. Russian Journal of Developmental Biology Springer Journals

Morphogenesis in colonial hydroids: Pulsating rudiment splitting

Loading next page...
SP MAIK Nauka/Interperiodica
Copyright © 2008 by MAIK Nauka
Life Sciences; Animal Anatomy / Morphology / Histology; Developmental Biology
Publisher site
See Article on Publisher Site


You’re reading a free preview. Subscribe to read the entire article.

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches


Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.



billed annually
Start Free Trial

14-day Free Trial