Date of Award
Summer 1986
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Ocean & Earth Sciences
Program/Concentration
Oceanography
Committee Director
John R. McConaugha
Committee Member
William M. Dunstan
Committee Member
Patricia A. Tester
Abstract
Mandibular organs of the mud crab, Rhithropanopeus harrisii (Gould) were histologically located and followed throughout the larval cycle to determine their role in metamorphosis. Specimens from each day of the four larval stages and the megalopa stage were embedded in paraffin, sectioned at 8 μm, stained and observed under the microscope for the mandibular organs. The organs were located in the mandibular area of second, third and fourth stage larvae. The organs were probably present in the first stage zoeae and in the megalopa stage, although the
techniques of the study were not sensitive enough to observe them. The activity of the organs varied throughout the larval cycle. They were active during the early stages, much less active in the final larval stage, and inactive in the megalopa stage. These changes in activity suggest that the mandibular organs are secreting a juvenile hormone-like substance that controls metamorphosis.
Rights
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DOI
10.25777/0z6y-6b21
Recommended Citation
Hantske, Lore L..
"A Histological Investigation of the Larval Mandibular Organ in the Mud Crab Rhithropanopeus harrisii (Gould) (Crustacea Decapoda Xanthidae)"
(1986). Master of Science (MS), Thesis, Ocean & Earth Sciences, Old Dominion University, DOI: 10.25777/0z6y-6b21
https://digitalcommons.odu.edu/oeas_etds/221