Pseudonannolene sulcatula Silvestri, 1895

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 : 89-90

Pseudonannolene sulcatula Silvestri, 1895

Figs 131 , 176F , 188

Pseudonannolene sulcatula Silvestri, 1895b: 7 , fig. 14.

Pseudonannolene sulcatula – Viggiani 1973: 367. — Jeekel 2004: 91.

Diagnosis

Males of P. sulcatula resemble those of P. ophiiulus , P. strinatii , and P. tocaiensis by having a gonopod with a subtriangular gonocoxa; the internal branch being shovel-shaped, but differing by the absence of a horizontal plate in the internal branch ( Silvestri 1895b: 8, fig. 14; Fig. 131C ).

Etymology

Unspecified in the original description and not related to any morphological structure of the species.

Material examined (total: 1 ♀)

ARGENTINA – Salta • 1 ♀; Rosário de la Frontera; [-25.800215, -64.967830]; 200 m a.s.l.; 11 Apr. 1979; Misión Científica Danesa leg.; NHMD .

Descriptive notes

Gonopod description adapted from Silvestri (1895b: 7) to supplement original description and to introduce gonopod terminology; non-sexual characters described based on examined topotype.

MEASUREMENTS. 73 body rings (1 apodous + telson). Males: body length ca 85 mm; maximum midbody diameter 3.5 mm.

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

HEAD. Antennae short, 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 5 rows.

BODY RINGS. Collum with lateral lobes rounded, with ca 7 shallow striae. 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. 176F ).

GONOPODS. Gonocoxa (gcx) subtriangular, progressively less wide ( Fig. 131C ), with the base not arched; antero-posteriorly flattened; with rows of papillae mesally. Seminal groove (sg) not visible. Shoulder absent. Telopodite (tp) almost as wide as gcx; solenomere (sl) with apicomesal process (amp) short, subtriangular; ectal process (ep) inconspicuous, apparently separated from amp by shallow notch; sa not not visible apically. Internal branch (ib) shovel-shaped, narrow; almost not surrounding basally tp; setae restricted to the apical region of ib exceeding seminal region of sl ( Fig. 131C ).

VULVAE. As typical for the genus. Bursa subtriangular, glabrous; internal valve subtriangular; operculum narrow; external valve wide, subtriangular.

Distribution

Known only from northern Argentina ( Fig. 188 ).

Comments

The type material described by Silvestri (1895b) and supposedly deposited at the Museo Regionale Scienze Naturali, Torino, Italy (MRSN) ( Viggiani 1973: 367), was not found. Nevertheless, a topotype from northern Argentina was examined ( Fig. 188 ).

Figures

Fig. 131. Pseudonannolene sulcatula Silvestri, 1895, ♀ (NHMD). A. Body rings, in lateral view, and original label. B. Posterior region in lateral view. C. Schematic drawing of right gonopod in anal view (modified from Silvestri 1895b: fig. 14). 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. 188. Distribution map of the species Pseudonannolene segmentata Silvestri, 1895, P. silvestris Schubart, 1944, P. spelaea Iniesta & Ferreira, 2013, P. strinatii Mauriès, 1974, and P. sulcatula Silvestri, 1895.