Integrative taxonomic revision of the polymorphic flat-millipede genera Oncocladosoma and Somethus in South Australia (Diplopoda : Polydesmida : Paradoxosomatidae)
Peter Decker
+ Author Affiliations
- Author Affiliations
Department of Soil Zoology, Senckenberg Museum of Natural History Görlitz, Am Museum 1, 02826 Görlitz, Germany. Email: peter.decker@senckenberg.de
Invertebrate Systematics 30(3) 201-218 https://doi.org/10.1071/IS15047
Submitted: 20 October 2015 Accepted: 21 January 2016 Published: 29 June 2016
Abstract
The South Australian members of the flat-millipede genera Oncocladosoma Jeekel, 1985 and Somethus Chamberlin, 1920 are revised using an integrative approach incorporating sequence data and morphology. The partial mitochondrial cytochrome c oxidase subunit I (COI) barcoding gene and partial nuclear ribosomal 28S rRNA were amplified and sequenced for 15 Oncocladosoma specimens and 10 Somethus specimens and the datasets were used for molecular phylogenetic analysis and genetic distance determination. Both morphology and molecular data indicate that all species of Oncocladosoma fall within Somethus, and therefore, Oncocladosoma is synonymised with Somethus. Within those species supported by molecular data, features of the solenomere tip are relatively stable and useful for species identification. 28S rRNA has proven to provide sufficient nucleotide variation to provisionally discriminate species. Oncocladosoma castaneum ingens Jeekel, 1985, O. clavigerum Jeekel, 1985 and O. conigerum Jeekel, 1985 are junior synonyms of Somethus castaneus, comb. nov., and Somethus modicus Jeekel, 2002 is a synonym of S. scopiferus Jeekel, 2002. New records and electron scanning micrographs of gonopods are provided for S. castaneus, comb. nov., S. inflatus (Jeekel, 2002), comb. nov., S. lancearius Jeekel, 2002, S. scopiferus Jeekel, 2002, and Somethus grossi Jeekel, 1985, together with a key to the South Australian species of Somethus.
Additional keywords: 28S, Arthropoda, barcoding, COI, genetic variability.
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