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More limbs on the tree: Mitogenome characterization and systematic position of “living fossil” species Neoglyphea inopinata and Laurentaeglyphea neocaledonica (Decapoda: Glypheidea: Glypheidae)
Glypheids first appeared in the Lower Triassic period and were believed to be extinct until specimens of Neoglyphea inopinata and Laurentaeglyphea neocaledonica were discovered in 1975 and 2005, respectively. The finding of extant species has meant that molecular data can now be used to complement morphological and fossil-based studies to investigate the relationships of Glypheidea within the Decapoda. However, despite a number of molecular studies, the placement of this infraorder within the decapod phylogenetic tree is not resolved. One limitation is that molecular resources available for glypheids have been limited to a few nuclear and mitochondrial gene fragments. Many of the more recent large-scale studies of decapod phylogeny have used information from complete mitogenomes, but have excluded the infraorder Glypheidea due to the unavailability of complete mitogenome sequences. Using next-generation sequencing (NGS), we successfully sequenced and assembled complete mitogenome sequences from museum specimens of N. inopinata and L. neocaledonica, the only two extant species of glypheids. With these sequences, we constructed the first decapod phylogenetic tree based on whole mitogenome sequences that includes Glypheidea as one of ten decapod infraorders positioned within the suborder Pleocyemata. From this, the Glypheidea appears to be a relatively derived lineage related to the Polychelida and Astacidea. Also in our study, we conducted a survey on currently available decapod mitogenome resources available on NCBI and identified infraorders that would benefit from more strategic and expanded taxonomic sampling.
IS17050 Accepted 04 August 2017
© CSIRO 2017