Evodevo. 2015 Mar 11;6:4. doi: 10.1186/2041-9139-6-4. eCollection 2015.
Evolution of eumalacostracan development-new insights into loss and reacquisition of larval stages revealed by heterochrony analysis.
EvoDevo
Günther Joseph Jirikowski, Carsten Wolff, Stefan Richter
Affiliations
Affiliations
- Institut für Biowissenschaften, Allgemeine und Spezielle Zoologie, Universität Rostock, Universitätsplatz 2, 18055 Rostock, Germany.
- Institut für Biologie, Vergleichende Zoologie, Humboldt-Universität zu Berlin, Philippstr. 13, Haus 2, 10115 Berlin, Germany.
PMID: 25973168
PMCID: PMC4429915 DOI: 10.1186/2041-9139-6-4
Abstract
BACKGROUND: Within Malacostraca (Crustacea), direct development and development through diverse forms of larvae are found. Recent investigations suggest that larva-related developmental features have undergone heterochronic evolution in Malacostraca. In the light of current phylogenetic hypotheses, the free-swimming nauplius larva was lost in the lineage leading to Malacostraca and evolved convergently in the malacostracan groups Dendrobranchiata and Euphausiacea. Here we reconstruct the evolutionary history of eumalacostracan (Malacostraca without Phyllocarida) development with regard to early appendage morphogenesis, muscle and central nervous system development, and determine the heterochronic transformations involved in changes of ontogenetic mode.
RESULTS: Timing of 33 developmental events from the different tissues was analyzed for six eumalacostracan species (material for Euphausiacea was not available) and one outgroup, using a modified version of Parsimov-based genetic inference (PGi). Our results confirm previous suggestions that the event sequence of nauplius larva development is partly retained in embryogenesis of those species which do not develop such a larva. The ontogenetic mode involving a nauplius larva was likely replaced by direct development in the malacostracan stem lineage. Secondary evolution of the nauplius larva of Dendrobranchiata from this ancestral condition, involved only a very small number of heterochronies, despite the drastic change of life history. In the lineage leading to Peracarida, timing patterns of nauplius-related development were lost. Throughout eumalacostracan evolution, events related to epidermal and neural tissue development were clearly less affected by heterochrony than events related to muscle development.
CONCLUSIONS: Weak integration between mesodermal and ectodermal development may have allowed timing in muscle formation to be altered independently of ectodermal development. We conclude that heterochrony in muscle development played a crucial role in evolutionary loss and secondary evolution of a nauplius larva in Malacostraca.
Keywords: Heterochrony; Larval development; Malacostraca; Muscle development; Nauplius Larva, Egg Nauplius; Phylogeny
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