Paredrodesmus purpureus, Mesibov, Robert, 2003

Mesibov, Robert, 2003, Two new and unusual genera of millipedes (Diplopoda: Polydesmida) from Tasmania, Australia, Zootaxa 368, pp. 1-32: 17-19

publication ID 10.5281/zenodo.157087

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scientific name

Paredrodesmus purpureus

n. sp.

Paredrodesmus purpureus   n. sp.

Figs. 6 View FIGURE 6 , 10 View FIGURE 10 , map Fig. 12 View FIGURE 12 D

Holotype: Male , Pelverata Falls, EN 112325 View Materials (43 °03’ 35 ”S, 147 °08’ 15 ”E), 6.iv. 2003, K. Bonham, QVM 23 View Materials : 25460. GoogleMaps  

Paratypes: Male, Macgregor Peak, EN 769413 View Materials (42 ° 58 ’ 36 ”S, 147 ° 56 ’ 35 ”E), 550m, 9.x. 1999, K. Bonham, D. Hird & A. Thompson, AM KS 86293 (formerly QVM 23: 41225); GoogleMaps   four females, Huon River (Arve Road) , DN 798283 View Materials (43 °05’ 51 ”S, 146 ° 45 ’06”E), 210m, 16.v. 1997, R. Mesibov, QVM 23: 41216, plot 3 R 1 GoogleMaps   .

Other material examined: 3 males, 27 females and 13 juveniles. See Appendix for details.

Diagnosis: Distinguished from other Paredrodesmus   by purple colouration and the unique form of the gonopod.

Description: As for the genus. Males 10–11 mm long, 0.8–0.9 mm in maximum vertical diameter. In alcohol, well­coloured adults are finely mottled purple apart from nearwhite head, proximal antennomeres, legs and epiproct. Antennal bases separated by ca. 1.5 times a base diameter, antennomere 6 about one and a quarter times the width of 5. Waist more pronounced than in other Paredrodesmus   . Legpairs 6 and 7 with a wide gap between opposing coxae, legpairs 4 and 5 with a narrower gap, legpair 3 with a small gap, legpair 3, 4 and 5 gaps filled with dense brushes of setae; flexed gonopods reach to legpair 5. Genital opening on leg 2 coxa on a small mesal projection ( Fig. 6 View FIGURE 6 A). Gonopod aperture with rear margin raised in the middle. Telopodite ( Fig. 10 View FIGURE 10 ) with base block­like with a few short setae, the posterolateral corner of the distal surface of the base projected distally and bearing two long setae. Distal portion of telopodite arising on the anterior side of the base, subcylindrical, expanding distally and slightly curving posterolaterally into a rounded, clublike tip. Arising just proximal to the apex on the anteromesal surface is a flat, S­shaped, mesally directed process, with the very small, bluntly pointed solenomerite (‘s’ in Fig. 10 View FIGURE 10 ) arising just posterior to the base of the S­shaped process. The prostatic groove runs more or less directly to the solenomerite on the mesal side of the telopodite. Anterolaterally on the telopodite are two separate combs of variably long, peg­like structures: a subterminal group of ca. 20 pegs directed posterolaterad and proximad, and a more proximal group of ca. 25 pegs closely pressed to the telopodite and directed proximad; the line of origin of the latter group arises at about two­thirds the length of the telopodite on the anterior surface and curves laterad.

Distribution and habitat: In well­rotted litter, humus and richly organic soil over ca. 2500 km 2 in southeastern Tasmania including Bruny Island, from 60 m to ca. 550 m, mainly in wet eucalypt forest and Nothofagus   rainforest ( Fig. 12 View FIGURE 12 D). Co­occurs with P. a c e ­ riodendron in the east of its range and possibly overlaps with P. bicalcar   in the west. This is an uncommon species with a low male/female ratio.

Etymology: Latin purpureus   , purple, adjective, referring to the colour of the live animal.




Australian Museum