Conflict of interest: All authors of this article confirm that no conflict of interest of any potential source is present.
Heterochrony in mandible development of larval shrimp (Decapoda: Caridea)—A comparative morphological SEM study of two carideans
Article first published online: 29 MAY 2014
© 2014 Wiley Periodicals, Inc.
Journal of Morphology
Volume 275, Issue 11, pages 1258–1272, November 2014
How to Cite
Batel, A., Melzer, R. R., Anger, K. and Geiselbrecht, H. (2014), Heterochrony in mandible development of larval shrimp (Decapoda: Caridea)—A comparative morphological SEM study of two carideans. J. Morphol., 275: 1258–1272. doi: 10.1002/jmor.20299
- Issue published online: 10 OCT 2014
- Article first published online: 29 MAY 2014
- Manuscript Accepted: 1 MAY 2014
- Manuscript Revised: 14 APR 2014
- Manuscript Received: 13 NOV 2013
- Sea Life Center (Munich)
- Graduiertenstipendium; BayEFG
- Palaemon elegans;
- Macrobrachium amazonicum;
- larval morphology;
Mandible development in the larval stages I–V of two palaemonid shrimp species, Palaemon elegans and Macrobrachium amazonicum, was analyzed using scanning electron microscopy, light microscopy, and confocal laser scanning microscopy. In contrast to the zoea I of P. elegans, first-stage larvae of M. amazonicum are nonfeeding. At hatching, the morphology of the mandibles is fully expressed in P. elegans, while it appears underdeveloped in M. amazonicum, presenting only small precursors of typical caridean features. In successive zoeal stages, both species show similar developmental changes, but the mandibular characters of the larvae in M. amazonicum were delayed compared to the equivalent stages in P. elegans, especially in the development of submarginal setae and mandible size. In conclusion, our results indicate heterochrony (postdisplacement) of mandible development in M. amazonicum compared to that in P. elegans, which is related to initial lack of mandible functionality or planktivorous feeding at hatching, respectively. This conclusion is supported by comparison with other palaemonid zoeae exhibiting different feeding modes. Our data suggest that an evolutionary ground pattern of mandible morphology is present even in species with nonfeeding first-stage larvae. J. Morphol. 275:1258–1272, 2014. © 2014 Wiley Periodicals, Inc.