The Morphology of the Phoronid Phoronopsis harmeri

The Morphology of the Phoronid Phoronopsis harmeri We studied the morphology and gross anatomy of the phoronid Phoronopsis harmeriusing light microscopy and scanning electron microscopy. The body of Ph. harmeriis subdivided into several regions: a lophophore, a head, anterior, and posterior parts of the body, and an ampulla. The lophophore is spiral and comprises 0.5 turns. In males, there are lophophoral organs in the tentacular crown; under the lophophore, there is an epithelial fold or collar. The internal organization shows partitioning into three coeloms: the coelom of the epistome, the tentacular coelom, and the trunk coelom. The trunk coelom is divided into a series of chambers by a complex system of mesenteries. The intestine is U-shaped, and the epistome is located above the mouth opening. The circulatory system is closed and consists of the following vessels: the efferent and afferent “circular”, left and right lateral (efferent), and medial (afferent) vessels. In Ph. harmeri, there is a dorsolateral (afferent) vessel running through the ampulla and the lower part of the posterior trunk region. The excretory system is composed of paired metanephridia that resemble asymmetrical U-shaped tubes. Sexual dimorphism is characteristic of the structure of the distal part of the nephridium, which opens into the body cavity. The nervous system consists of a dorsal nervous field, a circular nerve plexus, and a giant left nerve fiber. Ph. harmeriis a dioecious species; the gametes develop in a vasoperitoneal tissue that envelops the intestine in the posterior part of the trunk region. Russian Journal of Marine Biology Springer Journals

The Morphology of the Phoronid Phoronopsis harmeri

Loading next page...
Kluwer Academic Publishers-Plenum Publishers
Copyright © 2001 by MAIK “Nauka/Interperiodica”
Life Sciences; Freshwater & Marine Ecology
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