Pseudonannolene centralis Silvestri, 1902

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 : 33-34

Pseudonannolene centralis Silvestri, 1902

Figs 62–63 , 176D , 182

Pseudonannolene centralis Silvestri, 1902: 19 .

Pseudonannolene centralis – Jeekel 2004: 88.

Diagnosis

Males of P. centralis resemble those of P. typica by having a solenomere with a short ectal process, separated from the apicomesal process by a shallow notch, and an internal branch with a distal projection ( Fig. 63D ). Pseudonannolene centralis differs from P. typica by an inconspicuous shoulder on the gonocoxa ( Fig. 63C ); a torsion of the internal branch short and starting apically ( Fig. 63D ); the head partially covered by scattered setae.

Etymology

Although unspecified in the original description, the species name probably refers to the central region in Paraguay where the species was found.

Material examined

Syntypes PARAGUAY • 1 ♂; Paraguarí; [-25.621436, -57.149997]; 12 Oct. 1900; A. Borelli leg.; USNM 2033 • 1 ♀ [examined by photographs]; same collection data as for preceding; ZMB 2884 .

Descriptive notes

MEASUREMENTS. 62–66 body rings (1–2 apodous + telson). Males: body length ca 70 mm; maximum midbody diameter 5 mm.

COLOR. Body color greyish; collum darker; prozonites anteriorly greyish; metazonites with a medial brown band and a posterior lighter brown band; antennae and legs lighter brown.

HEAD. Antennae short ( Fig. 62A ), just reaching back to end of ring 5 when extended dorsally; relative antennomere lengths 1<2<3>4≈5≈6>7. Mandibular cardo with ventral margin narrow. Ommatidial cluster well-developed, elliptical; ca 30 ommatidia in 4 rows.

BODY RINGS. Collum with lateral lobes rounded, with ca 6 striae, slightly curved ectad ( Fig. 62A ). Very faintly constricted between prozonite and metazonite; prozonites smooth; metazonites laterally with transverse striae below ozopore. Anterior sterna in midbody rings subrectangular, without transverse striae ( Fig. 176D ).

FIRST LEG-PAIR OF MALES. Coxae (cx) short (less than half of remaining podomere lengths), subtriangular, with the base strongly arched and constricted medially, densely setose mainly on distal region ( Fig. 63A ); prefemoral process (prf) half as wide as prefemur, subcylindrical, densely setose up to its median region; 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. 63B ); prefemur dorsoventrally compressed; remaining podomeres setose.

GONOPODS. Gonocoxa (gcx) elongated, almost twice as long as telopodite, with the base arched; flattened antero-posteriorly ( Fig. 63C ); 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) almost as wide as gcx ( Fig. 63D ); solenomere (sl) with apicomesal process (amp) rounded; ectal process (ep) subtriangular, separated from amp by notch; sa located at mesal portion, slightly visible apically. Internal branch (ib) subtriangular, narrow, surrounding base of tp as a shield; with torsion of 180° in the distal portion and a short, rounded projection, directed ectad; ib with setae along its entire margin exceeding apically seminal region of sl ( Fig. 63C–D ).

VULVAE. Not examined.

Distribution

Known only from the type locality Paraguarí, Paraguay ( Fig. 182 ).

Comments

The species was not mentioned in the list of species described by Silvestri (see Viggiani 1973).

Figures

Fig. 62. Pseudonannolene centralisSilvestri, 1902, syntype, ♂ (USNM 2033), in lateral view. A.Anterior region. B. Posterior region. Images not to scale.

Fig. 63. Pseudonannolene centralis Silvestri, 1902, syntype, ♂ (USNM 2033). A. First leg-pair. B. Second leg-pair. C. Gonopods, in anal view. D. Detail of telopodites, in anal view. E. Original label of type material. F. Body of female syntype, in lateral view (ZMB 2884). Abbreviations: see Material and methods. Images not to scale.

Fig. 176. Stereoscopic images of gnathochilarium and anterior sternum of species of Pseudonannolene Silvestri, 1895. A. P. pusilla Silvestri, 1895. B. P. bovei Silvestri, 1895. C. P. brevis Silvestri, 1902. D. P. centralis Silvestri, 1902. E. P. rugosetta Silvestri, 1897. F. P. sulcatula Silvestri, 1895. Images not to scale.

Fig. 182. Distribution map of the species Pseudonannolene caulleryi Brölemann, 1929, P. centralis Silvestri, 1902,P. curtipes Schubart, 1960, P. erikae Iniesta & Ferreira, 2014 and P. fontanettiae Iniesta & Ferreira, 2014.