Autostreptus, Silvestri, 1905

Parra-Gómez, Antonio, Iniesta, Luiz F. M. & Morales, Jesús A., 2025, Revisiting the poorly known Chilean genus Autostreptus Silvestri, 1905 (Diplopoda, Spirostreptida, Spirostreptidae) with the description of a new species, European Journal of Taxonomy 1004, pp. 237-258 : 253

Key to males of Autostreptus

1. Telopodite (tp) with a broad, lamellar expansion (ltp) ( Figs 5D–E , 7D–E ); ltp covering distally the solenomere (sl), and with its margin thickened ( Figs 5F , 7F ) .......................................................... 2

– Telopodite (tp) with a thick, but not broad lamellar expansion (ltp) ( Fig. 9C–F ) ............................... ..................................................................................................................... A. silvagonzalezi sp. nov.

2. First leg-pair with subtriangular prefemoral process (pfp) ( Fig. 5A ); ltp with a protruding serrated zone, hidden by lamellar expansion ( Fig. 5F ) ....................................... A. chilensis ( Gervais, 1847)

– First leg-pair with subrectangular prefemoral process (pfp) ( Fig. 7A ); ltp with a distally bifurcated process, hidden by lamellar expansion ( Fig. 7F ) .......................... A. yanezi Demange & Silva, 1971

Figures

Fig. 5. Autostreptus chilensis (Gervais, 1847), male sexual characters. A, C–E. PG-34-VAL (MNHNCL). B, F. e-8 (MNHNCL). A. First leg-pair, anterior view. B. Second leg-pair, posterior view. C–F. Left gonopod. C. Anterior view. D. Posterior view. E. Lateral view. F. Detail of the distal region of telopodite, lateral view (arrow indicating the protruding serrated zone). Abbreviations: atp = antetorsal process of telopodite; dmp = distolateral metaplica process; ltp = lamellar expansion of telopodite; map = mesoapical metaplica process; mp = metaplica; pfp = prefemoral process of first male leg-pair; pn = penes; pp = proplica; px = paracoxite; sg = seminal groove; sl = solenomere; tp = telopodite. Scale bars: A, F = 0.6 mm; B = 0.5 mm; C = 0.8 mm; D = 1 mm; E = 1.2 mm.

Fig. 7. Autostreptus yanezi Demange & Silva, 1971 (e-57, MNHNCL), male sexual characters. A. First leg-pair, anterior view. B. Second leg-pair, posterior view. C–F. Left gonopod. C. Anterior view (detail of arrow indicating the mesoapical dentiform process on proplica). D. Posterior view. E. Lateral view. F. Detail of distal region of telopodite, medial view (arrow indicating bifurcated process). Abbreviations: atp = antetorsal process of telopodite; dmp = distolateral metaplica process; ltp = lamellar expansion of telopodite; map = mesoapical metaplica process; mp = metaplica; pfp = prefemoral process of first male leg-pair; pn = penes; pp = proplica; px = paracoxite; sg = seminal groove; sl = solenomere; tp = telopodite. Scale bars: A–B = 0.5 mm; C–E = 0.7 mm; F = 0.3 mm.

Fig. 9. Autostreptus silvagonzalezi sp. nov., holotype, ♂ (MNHNCL 8449), sexual characters. A. First leg-pair, anterior view. B. Second leg-pair, posterior view. C–F. Left gonopod. C. Anterior view. D. Posterior view. E. Lateral view. F. Detail of distal region of telopodite, posterior view. Abbreviations: atp = antetorsal process of telopodite; dmp = distolateral metaplica process; ltp = lamellar expansion of telopodite; map = mesoapical metaplica process; mp = metaplica; pfp = prefemoral process of first male leg-pair; pn = penes; pp = proplica; px = paracoxite; sg = seminal groove; sl = solenomere; tp = telopodite. Scale bars: A, E = 0.6 mm; B–C, F = 0.5 mm; D = 0.7 mm.