Pogonosternum adrianae Jeekel, 1982

Decker, Peter, Mesibov, Robert, Voigtländer, Karin & Xylander, Willi E. R., 2017, Revision of the Australian millipede genus Pogonosternum Jeekel, 1965, with descriptions of two new species (Diplopoda, Polydesmida, Paradoxosomatidae), European Journal of Taxonomy 259, pp. 1-34 : 15-18

Pogonosternum adrianae Jeekel, 1982

Figs 5G , 7 , 12–14 , 26B

Pogonosternum adrianae Jeekel 1982a: 203 , 205, fig. 2

Pogonosternum adrianae – Mesibov 2004: 42 (record). — Jeekel 2006: 66 (mention). — Nguyen & Sierwald 2013: 1158 (record). — Decker 2016a: 16–25 (record, mention).

Diagnosis

Differs from other Pogonosternum species in having one lighter longitudinal stripe and no median darker stripe; from P. montanum Decker , sp. nov. and P. laetificum primarly by the enlarged femoral process 1 (fp1) and 2 (fp2) and the lateral process (lp) directed laterally, but also by the presence of a subtriangular pointed process of the female leg 2 coxa; male tarsal and tibial brushes present from legpair 1 to 7; anterior spiracles obliquely ovoid with anterodorsally slightly extended rim and spiracular filter not protruding; largest known species of Pogonosternum with midbody width of 2.8–3.2 mm.

Material studied

Holotype

AUSTRALIA: 1 ♂, Victoria, Toongabbie , 18 km NNE of Traralgon, margin of Eucalyptus forest with grassland, under logs, 15 Nov. 1980, leg. C.A.W. Jeekel and A.M. Jeekel-Rijvers ( NBC).

Paratypes

AUSTRALIA: 1 ♂, same data as holotype ( NBC).

Other material examined

See Supplement 1 (total: 5 localities, 11 ♂♂, 11 ♀♀, 8 juv.)

Description

MEASUREMENTS. Length ca 2.6–2.8 cm; midbody width ca 2.8–3.2 mm.

COLOURATION. Colour in fresh material ( Figs 12 , 26B ): margin of lateral edges of collum sometimes slightly lighter. Dorsum with broad median light yellowish brown stripe. On prozonites the trapezoidal paramedian light band slightly broader anteriorly, and on metazonites slightly broader posteriorly, broadest at 1/3 of length ( Figs 12D , 26B ). Flanks and area around ozopores slightly lighter ( Fig. 12C ).

STERNITES. No conspicuous sternal cones.

LEGS. Male tarsal and tibial brushes present from legpair 1 to 7, abruptly absent after. Female coxa of legpair 2 with pointed triangular process on caudal side directed distad, reaching ¾ of prefemur ( Fig. 5G ).

GONOPODS. Femorite (F) long and slender ( Fig. 13 ), narrowing towards prefemorite (PF). Prolongation of femorite (prof) long, slender, S-shaped, proximal half directed posteriad and apical half directed distad. Femoral process 1 (fp1) laminate, very long, subtriangular with pointed tip, slightly curved mesally, projecting distad of lateral process (lp) and slightly distad of solenomere (S). Femoral process 2 (fp2) very long, more slender than fp1, whitish in colour, inflated, attached closely to fp1; apex of fp2 curved, not attached to fp1, margin serrulate. Lateral process (lp) on lateral side of prof, short, slender, directed distolaterally, not projecting distad of solenomere.

SPIRACLES. Anterior spiracles obliquely ovoid. Rim slightly raised and spiracular filter not protruding. Posterior spiracle ovoid with low rim, spiracular filter not protruding ( Fig. 14 ).

Distribution

Strzelecki Ranges and central southern part of the Victorian Highlands ( Fig. 7 ).

Remarks

A phylogenetic analysis ( Decker 2016a) showed that this species is very closely related to P. laetificum with low genetic distances between populations of the two species.

We accept P. adrianae as a valid species because of its constant morphology, larger size and distinctive details of the gonopods (prof, fp1, fp2, F), spiracles, dorsal colouration and process of female second leg 2 coxa, with no intermediate features between P. adrianae and P. laetificum noted.

Figures

Fig. 5. Legs of Pogonosternum. A, D–E. P. nigrovirgatum (Carl, 1902) (NMV K-12158). A. Male left leg 1, posterior view. B. P. nigrovirgatum (Carl, 1902) (QVMAG 23:46359), male right leg 2, anteroventral view. C. P. jeekeli Decker, sp. nov. (AMS KS106742), male midbody leg, anterior view. D. Male right leg 7, anterior view. E. Male tarsus of right legpair 7, anterior view. F. P. laetificum Jeeker, 1982 (NMV K-9957), female left leg 2, ventral view. G. P. adrianae Jeeker, 1982 (NMV K-12203), female left leg 2, anterior view. H. P. montanum Decker, sp. nov. (AMS KS106907), female left leg 2, anterior view. Scale bars: 0.2 mm.

Fig. 7. Map of southeastern Australia and Tasmania, showing the known distribution of Pogonosternum spp.: red circles = P. nigrovirgatum (Carl, 1902); green stars = P. laetificum Jeeker, 1982; yellow squares = P. adrianae Jeeker, 1982; blue triangles = P. montanum Decker, sp. nov.; orange diamonds = P. jeekeli Decker, sp. nov. Abbreviation: ACT = Australian Capital Territory.

Fig. 12. Pogonosternum adrianae Jeekel, 1982, male from Moe-Walhalla Road (NMV K-12207). A–B. Anterior rings. A. Left lateral view. B. Dorsal view. C–D. Rings 10 and 11. C. Left lateral view. D. Dorsal view. E–F. Posterior rings. E. Left lateral view. F. Dorsal view. Scale bars: 1 mm.

Fig. 13. Pogonosternum adrianae Jeekel, 1982, male, right gonopod (NMV K-10719). A. Posterior view. B. Lateral view. C. Anterior view. D. Mesal view. Scale bars = 0.5 mm.

Fig. 14. Pogonosternum adrianae Jeekel, 1982, male, spiracles, midbody ring, left lateral side (NMV K-10719). Scale bar = 0.1 mm.

Fig. 26. Habitus and live colouration. A. Pogonosternum nigrovirgatum (Carl, 1902), ♂ from Adams Creek Nature Conservation Reserve (SMNG VNR016989). B. P. adrianae Jeeker, 1982, ♂ from Grand Ridge Road (NMV K-13349). C. P. laetificum Jeeker, 1982, ♂ from Toolangi State Forest, Two Hills Road. D. P. jeekeli Decker, sp. nov., ♂ from Warby-Ovens National Park, Taminick Gap Road. E. P. montanum Decker, sp. nov., ♂ (left, NMV K-12183) and ♀ (right, NMV K-13351) from Linden Roth Drive. Scale bars = 5 mm.