Neurogenesis suggests independent evolution of opercula in serpulid polychaetes.

BMC Evolutionary Biology
Nora Brinkmann, Andreas Wanninger

Abstract

The internal phylogenetic relationships of Annelida, one of the key lophotrochozoan lineages, are still heavily debated. Recent molecular analyses suggest that morphologically distinct groups, such as the polychaetes, are paraphyletic assemblages, thus questioning the homology of a number of polychaete morphological characters. Serpulid polychaetes are typically recognized by having fused anterior ends bearing a tentacular crown and an operculum. The latter is commonly viewed as a modified tentacle (= radiole) and is often used as an important diagnostic character in serpulid systematics. By reconstructing the developmental neuroanatomy of the serpulid polychaete Spirorbis cf. spirorbis (Spirorbinae), we found striking differences in the overall neural architecture, the innervation pattern, and the ontogenetic establishment of the nervous supply of the operculum and the radioles in this species. Accordingly, the spirorbin operculum might not be homologous to the radioles or to the opercula of other serpulid taxa such as Serpula and Pomatoceros and is thus probably not a part of the tentacular crown. We demonstrate that common morphological traits such as the prostomial appendages may have evolved independently in respective ser...Continue Reading

References

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Citations

Feb 13, 2016·Journal of Zoological Systematics and Evolutionary Research = Zeitschrift Für Zoologische Systematik Und Evolutionsforschung·Alen KristofAndreas Wanninger
Feb 27, 2013·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Conrad HelmChristoph Bleidorn
Jun 1, 2017·Frontiers in Zoology·Viktor V StarunovLeonid P Nezlin
Dec 14, 2018·PloS One·Nadezhda N Rimskaya-KorsakovaVladimir V Malakhov

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