Revision of the Australian millipede genus Pogonosternum Jeekel, 1965, with descriptions of two new species (Diplopoda, Polydesmida, Paradoxosomatidae)

Abstract

Abstract. The southeastern Australian millipede genus Pogonosternum Jeekel, 1965 is revised. Pogonosternum nigrovirgatum (Carl, 1902), P. adrianae Jeekel, 1982 and P. laetificum Jeekel, 1982 are redescribed; P. jeekeli Decker, sp. nov. and P. montanum Decker, sp. nov. are described from Victoria, New South Wales and Tasmania. P. nigrovirgatum infuscum Jeekel, 1982 and P. coniferum Jeekel, 1965 are junior synonyms of P. nigrovirgatum (Carl, 1902). An updated key to all five species of the genus is presented.

A new species of Tridactylogonus Jeekel, 1982 from South Australia (Diplopoda, Polydesmida, Paradoxosomatidae)

“…2 in Mesibov 2009, fig. 4B in Decker et al 2017), the spiracular filter elements in the new species are flattened and have forked tips.…”

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

“…3), the gonopod morphology of the seven Dargo specimens is closest to that of P.nigrovirgatum . In addition, tibial and tarsal brushes in the Dargo males extend only to leg pair 7, whereas in P.jeekeli the brushes reach leg pair 9 (74 studied males, Decker et al 2017). In P.nigrovirgatum male brushes typically extend to leg pair 7, and infrequently to leg pair 9 in the area around Port Philip Bay.…”

“…3) and male tarsal and tibial brushes only on leg pairs 1–7. See also Decker et al (2017) for a detailed (re)description of P.nigrovirgatum and P.jeekeli and the considerable gonopod variability in these species as well as Decker 2016a for phylogeographic distribution of similar gonopod morphology. However, the four sequenced “Dargo” males are all phylogenetically closer to P.jeekeli in the combined COI and 16S dataset and form a well-supported group (Fig.…”

“…Two cases of disagreement between relationships inferred from morphological similarity and molecular phylogenetics were observed in recent taxonomic studies of the Australian paradoxosomatid genera Pogonosternum Jeekel, 1965 (Decker 2016a, Decker et al 2017) and Somethus Chamberlin, 1920 (Decker 2016b). These two cases are described here in detail and discussed with regard to hybridisation, past introgressive hybridisation events and aberrant morphology.…”

An annotated list of the millipede (Diplopoda) species described by Johann Carl

“…Both of the identifi cation labels in the jar have "Melbourne M. Martin" written on them, indicating that the specimens are part of the type series. Decker et al (2017) designated the ♂ as the lectotype and the ♀ as a paralectotype. Strongylosoma nigrovirgatum was designated as the type species of Pogonosternum Jeekel, 1965 in the original description of the genus.…”