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Rhopalium development in Aurelia aurita ephyraeRhopalia of developing ephyrae were examined using the SEM and TEM at 24 h intervals following strobilation induction. Kinocilia are shorter in the ephyra stage than in polyps. A few ephyra-type kinocilia are found in rhopalia as early as 24 h after induction, before a distinct rhopalium is seen. By 72 h, the shorter kinocilia predominate and are almost as numerous as in ephyrae (120 h). Many of the kinocilia are associated with mechanoreceptor cells (MR) found in the rhopalia. These MR cells are compared to those reported for medusae. Although newly released ephyrae lack a touch plate, the MR cells in their rhopalia along with the statocyst and neuromuscular system apparently enable these organisms to detect and respond to gravity.
Document ID
20040090206
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Spangenberg, D. B.
(Eastern Virginia Medical School Norfolk 23501)
Date Acquired
August 21, 2013
Publication Date
June 28, 1991
Publication Information
Publication: Hydrobiologia
Volume: 216-217
ISSN: 0018-8158
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAG2-508
CONTRACT_GRANT: NAG2-343
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Developmental Biology
Non-NASA Center
NASA Discipline Number 40-20
NASA Discipline Number 00-00
NASA Program Flight
NASA Program Space Biology

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