Molecular phylogeny provides new insights into the classification of the order Spirostreptida (Arthropoda: Diplopoda), with description of Pericambala foveiformis, sp. nov. (Cambalidea: Pericambalidae) using integrated evidence
Hong-Ru Xu A B , Kuang Zhang C , Hui Wang A B , Wei-Xin Liu
D * and Liang Li A B *
A
B
C
D
Abstract
The millipede order Spirostreptida (Arthropoda: Diplopoda) displays extremely high species diversity. However, the current classification of Spirostreptida is controversial, and the systematic status and phylogenetic relationships of some of its included superfamilies or families and genera remain uncertain due to the paucity and inaccessibility of suitable material or genetic data for key taxa. In the present study, a new pericambalid species, Pericambala foveiformis, sp. nov. (Cambalidea), is described using integrated methods. Moreover, the complete mitochondrial genomes of this new species and Agaricogonopus acrotrifoliolatus Zhang & Zhang, 1997, are sequenced and annotated. The mitogenome of P. foveiformis, sp. nov. is the first for the suborder Cambalidea, whereas that of A. acrotrifoliolatus is the first for the family Harpagophoridae. The mitogenome of P. foveiformis, sp. nov. with 17,467 bp in length, is the largest diplopod mitogenome currently known. Phylogenetic results based on the 16S rRNA (16S) + cox1 data and the concatenated amino acid sequences of 13 mitogenome protein-coding genes, both support the division of the order Spirostreptida into two suborders, Cambalidea and Spirostreptidea, but do not support the division of the suborder Spirostreptidea into two superfamilies Odontopygoidea and Spirostreptoidea, because of the two odontopygoid genera Chaleponcus and Prionopetalum nested within Spirostreptoidea. The phylogenetic analyses of 16S + cox1 data also show that Harpagophoridae and Pericambalidae are each monophyletic. However, the phylogenetic relationships among the three families Harpagophoridae, Odontopygidae and Spirostreptidae within Spirostreptidea remain unresolved.
ZooBank: urn:lsid:zoobank.org:pub:A5A9F1D8-7958-4F72-9DD3-919B9304A03A
Keywords: DNA sequence data, Harpagophoridae, millipede, mitochondrial genome, morphology, new species, Pericambalidae, phylogeny, Spirostreptida.
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