Comparative histology of the adult electric organ among four species of the genus Campylomormyrus (Teleostei: Mormyridae)

Paul, Christiane; Mamonekene, Victor; Vater, Marianne; Feulner, Philine; Engelmann, Jacob; Tiedemann, Ralph; Kirschbaum, Frank (2015). Comparative histology of the adult electric organ among four species of the genus Campylomormyrus (Teleostei: Mormyridae). Journal of Comparative Physiology A, 201(4), pp. 357-374. Springer 10.1007/s00359-015-0995-6

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The electric organ (EO) of weakly electric mormyrids consists of flat, disk-shaped electrocytes with distinct anterior and posterior faces. There are multiple species-characteristic patterns in the geometry of the electrocytes and their innervation. To further correlate electric organ discharge (EOD) with EO anatomy, we examined four species of the mormyrid genus Campylomormyrus possessing clearly distinct EODs. In C. compressirostris, C. numenius, and C. tshokwe, all of which display biphasic EODs, the posterior face of the electrocytes forms evaginations merging to a stalk system receiving the innervation. In C. tamandua that emits a triphasic EOD, the small stalks of the electrocyte penetrate the electrocyte anteriorly before merging on the anterior side to receive the innervation. Additional differences in electrocyte anatomy among the former three species with the same EO geometry could be associated with further characteristics of their EODs. Furthermore, in C. numenius, ontogenetic changes in EO anatomy correlate with profound changes in the EOD. In the juvenile the anterior face of the electrocyte is smooth, whereas in the adult it exhibits pronounced surface foldings. This anatomical difference, together with disparities in the degree of stalk furcation, probably contributes to the about 12 times longer EOD in the adult.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology

UniBE Contributor:

Feulner, Philine

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

0340-7594

Publisher:

Springer

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

22 Jul 2015 10:51

Last Modified:

08 Sep 2015 09:56

Publisher DOI:

10.1007/s00359-015-0995-6

PubMed ID:

25752300

BORIS DOI:

10.7892/boris.70406

URI:

https://boris.unibe.ch/id/eprint/70406

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