Pseudonannolene alegrensis Silvestri, 1897

Iniesta, Luiz Felipe Moretti, Bouzan, Rodrigo Salvador & Brescovit, Antonio Domingos, 2023, A reassessment of the Neotropical genus Pseudonannolene Silvestri, 1895: cladistic analysis, biogeography, and taxonomic review (Spirostreptida: Pseudonannolenidae), European Journal of Taxonomy 867 (1), pp. 1-312 : 20-22

Pseudonannolene alegrensis Silvestri, 1897

Figs 44– 45 , 175E, 175B , 180 ; Supp. file 4: Figs 202C, 214C

Pseudonannolene alegrensis Silvestri, 1897c: 19 , pl. iii fig. 28.

Pseudonannolene alegrensis – Brölemann 1909: 56. — Viggiani 1973: 366. — Jeekel 2004: 88. — Iniesta & Ferreira 2013b: 357.

Justification of neotype designation

The type material of P. alegrensis deposited in the Senckenberg Naturhistorische Sammlungen, Dresden, Germany (SMTD), and other types of millipedes described by Silvestri in 1897, were lost during the bombing of Dresden on October 7, 1944 ( Sierwald & Reft 2004: 47). The species was described by Silvestri (1897c) based on an adult female collected in Porto Alegre, Rio Grande do Sul State, Brazil. Since no name-bearing type specimens for P. alegrensis exist and to secure the stability of the nomenclature, we selected topotype material from MCN to designate the neotype (for more details, see article #75.3.5 of ICZN).

Diagnosis

Males of P. alegrensis resemble those of P. rocana by having an elongated telopodite (longer than half of gonocoxa) ( Fig. 45D–F ), but differing by the presence of a large prefemoral process on the first leg-pair ( Fig. 45A–B ); subtriangular solenomere ( Fig. 45D ); and by having projections bearing setae on the paraproct (Supp. file 4: Fig. 202C).

Etymology

Adjective referring to the type locality of the species ( Silvestri 1897c).

Material examined

Neotype (here designated) BRAZIL • 1 ♂; Rio Grande do Sul, Porto Alegre, Lomba do Pinheiro ; [-30.116949, -51.101999]; 124 m a.s.l.; 17 Jul. 2010; M. Poiret leg.; MCN 626 .

Other material (total: 3 ♂♂, 6 ♀♀, 4 immatures)

BRAZIL – Rio Grande do Sul • 2 ♂♂, 5 ♀♀, 4 immatures; same collection data as for neotype; MCN 626 • 1 ♂, 1 ♀; Barra do Ribeiro, Fazenda Boa Vista ; [-30.292875, -51.316045]; 17 m a.s.l.; 18 Dec. 2003; R. Ott leg.; MCN 521 .

Descriptive notes

MEASUREMENTS. 58–60 body rings (1–2 apodous + telson). Males: body length 35–42.5 mm; maximum midbody diameter 1.8–1.9 mm. Females: body length 36–41 mm; maximum midbody diameter 2–3.1 mm.

COLOR. Body color greyish; prozonites darker; metazonites with a medial dark grey band and a posterior lighter one; head, collum, antennae and legs lighter brown.

HEAD. Antennae short ( Fig. 44A ), just reaching back to end of ring 4 when extended dorsally; relative antennomere lengths 1<2<3>4<5≈6>7. Mandibular cardo with ventral margin swollen. Ommatidial cluster well-developed, elliptical; ca 20 ommatidia in 5 rows.

BODY RINGS. Collum with lateral lobes broadly rounded, with ca 6 striae ( Fig. 44A ). Very faintly constricted between prozonite and metazonite; prozonites smooth; metazonites laterally with transverse striae below ozopore. Anterior sternum subrectangular, without transverse striae ( Fig. 175E ). Paraproct with rounded projections bearing setae ( Fig. 44B ).

FIRST LEG-PAIR OF MALES. Coxae (cx) elongated (as long as the sum of remaining podomere lengths), subtriangular, with the base arched, densely setose ( Fig. 45A ); prefemoral process (prf) as wide as half width of prefemur, subcylindrical, densely setose up to its median region ( Fig. 45B ); remaining podomeres with setae along the mesal region.

SECOND LEG-PAIR OF MALES. Coxa (cx) large and rounded; penis (pn) located at proximal region, rounded, not extended basally ( Fig. 45C ); prefemur compressed dorsoventrally; remaining podomeres setose, with long setae mesally.

GONOPODS. Gonocoxa (gcx) elongated, but less than twice the length of the telopodite, with the base arched; slightly flattened antero-posteriorly ( Fig. 45D–F ); with rows of papillae mesally. Seminal groove (sg) curved; arising medially on mesal cavity and terminating apically on the seminal apophysis (sa). Shoulder (sh) inconspicuous. Telopodite (tp) elongated, trunk stout ( Fig. 45D ); solenomere (sl) with apicomesal process (amp) subtriangular; ectal process absent; sa located at medial portion, visible apically. Internal branch (ib) subtriangular, narrow, curved ectad at midlength, surrounding the base of tp; ib with setae along its entire margin not exceeding apically the seminal region of sl ( Fig. 45D–F ).

VULVAE. As typical for the genus. Bursa subtriangular, glabrous ( Fig. 177B ); internal valve subtriangular, with mesal region rounded; operculum narrow, curved medially; external valve wide, subtriangular.

Distribution

Known only from the type locality Porto Alegre, Rio Grande do Sul, Brazil ( Fig. 180 ).

Figures

Fig. 44. Pseudonannolene alegrensis Silvestri, 1897 (MCN 626), in lateral view. A. Anterior region. B. Posterior region. Scale bars: A = 0.5 mm; B = 1 mm.

Fig. 45. Pseudonannolene alegrensis Silvestri, 1897, neotype, ♂ (MCN 626). A. First leg-pair. B. Detail of prefemur. C. Second leg-pair. D. Detail of telopodite, in anal view. E. Left gonopod, in anal view. F. Left gonopod, in oral view.Abbreviations: see Material and methods. Scale bars:A, C = 0.5 mm; B, D–F = 0.2 mm.

Fig. 175. Stereoscopic images of gnathochilarium and anterior sternum of species of Pseudonannolene Silvestri, 1895. A. P. granulata sp. nov. B. P. alata sp. nov. C. P. curvata sp. nov. D. P. aurea sp. nov. E. P. alegrensis. Images not to scale.

Fig. 180. Distribution map of the species Pseudonannolene albiventris Schubart, 1952, P. alegrensis Silvestri, 1897, P. ambuatinga Iniesta & Ferreira, 2013, P. anapophysis Fontanetti, 1996, and P. borelli Silvestri, 1895.

Fig. 177. Stereoscopic images of left vulva of species of Pseudonannolene Silvestri, 1895, in oral view. A. P. albiventris Schubart, 1952. B. P. alegrensis Silvestri, 1897. C. P. ambuatinga Iniesta & Ferreira, 2013. D. P. anapophysis Fontanetti, 1996. E. P. buhrnheimi Schubart, 1960. F. P. caatinga Iniesta & Ferreira, 2014. G. P. callipyge Brölemann, 1902. H. P. erikae Iniesta & Ferreira, 2014. I. P. fontanettiae Iniesta & Ferreira, 2014. J. P. halophila Schubart, 1949. K. P. imbirensis Fontanetti, 1996. L. P. inops Brölemann, 1929. M. P. leucocephalus Schubart, 1944. N. P. longicornis (Porat, 1888). O. P. lundi Iniesta & Ferreira, 2015. Images not to scale.