Research Article |
Corresponding author: Robert Mesibov ( robert.mesibov@gmail.com ) Academic editor: Sergei Golovatch
© 2015 Robert Mesibov, Catherine A. Car.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Mesibov R, Car CA (2015) A new genus and species of native exotic millipede in Australia (Diplopoda, Polydesmida, Paradoxosomatidae). ZooKeys 498: 7-16. https://doi.org/10.3897/zookeys.498.9716
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Taxidiotisoma portabile gen. n., sp. n. is described from scattered populations in New South Wales, Victoria and Tasmania, Australia. Populations of T. portabile in Victoria, Tasmania and parts of New South Wales occur in urban, suburban and agricultural areas, with no collections of the species in natural habitats in the same district. Taxidiotisoma portabile is likely to be a native exotic species whose home range is in eastern New South Wales.
Diplopoda , Polydesmida , Paradoxosomatidae , New South Wales, Victoria, Tasmania, Australia
We use the term “native exotic” for a species introduced and established well outside its native range, but still within its broader native region (
Although its original range is still uncertain, A. novarae is believed to be native to eastern Australia (
Heterocladosoma bifalcatum is likely to be native to the Brisbane area in southeast Queensland (
Solaenodolichopus pruvoti is also likely to be native to the Brisbane area (
Here a new genus and species of Australian paradoxosomatid is described which we suspect is native to eastern New South Wales, but which has also been collected in urban, suburban and agricultural areas in New South Wales, Tasmania and Victoria.
“Male” and “female” in the text refer to adult individuals. In this paper, the labeling of the different structures on the gonopod mainly follows that of
All specimens are stored in 75–80% ethanol in their respective repositories. Gonopod images were generated with a Leica MZ16A automontage imaging system using Leica Application Suite Version 3.7.0. Other photomicrographs are manually stacked composites, taken with a Canon EOS 1000D digital SLR camera mounted on a Nikon SMZ800 binocular dissecting microscope equipped with a beam splitter and processed with Zerene Stacker 1.04 software. Images were prepared for publication using GIMP 2.8. The locality map (Fig.
Suppl. material
Abbreviations in text and Suppl. material
Taxidiotisoma portabile Mesibov & Car, sp. n., by present designation.
None.
In gonopod structure, Taxidiotisoma gen. n. is closest to Antichiropus Attems, 1911, Australodesmus Chamberlin, 1920, Pogonosternum Jeekel, 1965 and Pseudostrongylosoma Verhoeff, 1924 in the Australian paradoxosomatid fauna (see Remarks). Differs from Antichiropus in lacking a process on the lateral surface of the femorite, from Pogonosternum in having the distal portion of the acropodite divided into two rather than three branches, from Pseudostrongylosoma in having a divided solenomere, and from Australodesmus in having a Y-shaped solenomere rather than a flagellum-and-sheath solenomere.
Greek taxidiotis, “traveller” + soma, Greek “body’, often used as an ending for generic names in Paradoxosomatidae; neuter gender.
The gonopod of Taxidiotisoma portabile sp. n. appears most similar to that of species in Antichiropus Attems, 1911, Australodesmus Chamberlin, 1920, Pogonosternum Jeekel, 1965 and Pseudostrongylosoma Verhoeff, 1924, all four of which have been assigned to Antichiropodini by
Taxidiotisoma portabile sp. n. is also characterized by a peculiar flattening of the head in lateral view, the result of depression of the clypeus.
Male, Munmorah State Reserve, NSW, 0.5 km along beach track opposite National Parks and Wildlife Service Station turnoff, site MUNI01/09, -33.2094 151.5894 ±25 m, pitfall 13–23 May 1998, L. Wilkie, AM KS.94041.
2 males, 1 female, details as for holotype but 21 April - 1 May 1997, site MUNI01/10, AM KS.93366.
100 males, 22 females and 5 juveniles (see Suppl. material
Male/female approximate measurements: length ca 20/20 mm, maximum midbody width 1.5/1.8 mm. Body shiny (Fig.
Male with vertex and frons almost bare, clypeus sparsely setose; clypeus strongly depressed, head truncate in profile (Figs
Gonopore small, round, opening on slight distomedial bulge of leg 2 coxa. Sternal lamella (Fig.
Gonopod aperture just wide enough to accommodate gonocoxae, ca 1/2 ring 7 prozonite width. Gonopod telopodites (Figs
Taxidiotisoma portabile sp. n., holotype male (AM KS. 94041), left gonopod. A posterior B anterior C medial and D lateral views. Abbreviations: C coxa, F femorite, NSB non-seminiferous branch, PF prefemur, S solenomere, s1 process with prostatic groove, s2 cowl-shaped process. Scale bars: 0.5 mm.
Taxidiotisoma portabile sp. n., holotype male (AM KS. 94041), detail of left gonopod tip, anterior view. Abbreviations: F femorite, NSB non-seminiferous branch, S solenomere, s1 process with prostatic groove, s2 cowl-shaped process, pg prostatic groove, t tooth. Dotted line denotes path of prostatic groove. Scale bar: 0.2 mm.
Female with depressed clypeus, without leg modifications; epigynum not raised, nearly straight, ca 1/4 ring 2 width; cyphopods not examined.
Taxidiotisoma portabile sp. n. has been collected over a north-south range of ca 1000 km in eastern Australia (Fig.
A small area of riparian vegetation on the Macquarie River, surrounded by farmland;
The town of Cowra (collecting site not more exactly known), surrounded by farmland;
The campus of Charles Sturt University in the city of Wagga Wagga;
A small area of remnant native vegetation in the city of Wagga Wagga;
Disturbed native vegetation on a roadside adjoining a large artificial lake;
A recreation reserve in the suburbs of the city of Melbourne;
A park in the centre of the city of Melbourne;
Riparian parkland under a highway bridge in the town of Perth, surrounded by farmland.
Sampling in the areas surrounding and between these eight locations, both by the authors and by other collectors, has not yet yielded any specimens of T. portabile sp. n. We therefore suspect that the species was introduced to these locations from its native range in eastern New South Wales.
Latin portabilis, “portable”, adjective. This species is almost certainly being transported to new areas in Australia by cars or trucks.
We do not know whether the eight “outlying” New South Wales, Tasmanian and Victorian samples (Fig.
We thank Graham Milledge (Australian Museum) and Peter Lillywhite and Catriona McPhee (Museum Victoria) for the loan of specimens, Wade Clarkson (Riverside, Tasmania) for alerting RM to the Tasmanian specimen of T. portabile sp. n., and Henrik Enghoff and Sergei Golovatch for valuable comments on a draft of the manuscript. This study was funded by the authors.
Specimen records of Taxidiotisoma portabile
Data type: Tab Separated Value File (tsv).
Explanation note: Specimen records of Taxidiotisoma portabile as of 30 March 2015.