Phylogenetic and morphological discord indicates introgressive hybridisation in two genera of Australian millipedes (Diplopoda, Polydesmida, Paradoxosomatidae)

By

Decker, Peter

Type

Article

Date of Publication

2018

Original Publication

ZooKeys

Volume

809

Pages

1-14

Subjects

16S , 28S , Aberrant morphology , Arthropoda , COI , hybridisation , Introgression , Myriapoda

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.809.30087

 

Abstract

Discord between molecular and morphological datasets was observed in two pairs of species of Australian millipedes in the family Paradoxosomatidae using morphological and molecular phylogenetic analysis (mitochondrial COI rDNA and 16 rRNA, and nuclear 28S rRNA). Close to the presumed distributional boundary betweenPogonosternumnigrovirgatum(Carl, 1912) andPogonosternumjeekeliDecker, 2017, near Dargo in Central Gippsland, Victoria,Pogonosternumspecimens were collected which are phylogenetically closer toP.jeekeliin COI and 16S sequences, but are morphologically closer toP.nigrovirgatum.At Mount Osmond, Adelaide, South Australia, eight morphologically typicalSomethuscastaneus(Attems, 1944) specimens were collected are phylogenetically closer toS.castaneusin 28S genealogy, but three of the eight are closer toS.lanceariusJeekel, 2002 in COI genealogy. These two cases are discussed in terms of hybridisation, past introgressive hybridisation events and aberrant morphology.