Pseudonannolene segmentata 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 : 82-83

Pseudonannolene segmentata Silvestri, 1895

Figs 123–124 , 172C , 178M , 188

Pseudonannolene segmentata Silvestri, 1895b: 7 .

Pseudonannolene segmentata – Silvestri 1902: 19 (description of female topotype). — Viggiani 1973: 367. — Jeekel 2004: 91. — Iniesta & Ferreira 2013a: 92; 2013b: 366.

Diagnosis

Males of P. segmentata slightly resemble those of P. bucculenta sp. nov. and P. morettii sp. nov. by having the internal branch narrow, foliaceus ( Fig. 124D–F ), but differing by the short prefemoral process on the first leg-pair ( Fig. 124A ); solenomere with ectal process subtriangular, separated from the apicomesal process by a shallow notch ( Fig. 124D ).

Etymology

Named after the Latin adjective ‘ segmentatus ’ = ‘adorned with borders or patches’. Unspecified in the original description.

Material examined (total: 9 ♂♂, 6 ♀♀, 9 immatures)

BRAZIL – Mato Grosso do Sul • 1 ♂, 1 ♀ immature; Bonito, Pitangueira ; [-21.136212, -56.485720]; 297 m a.s.l.; Oct. 2002; C.A. Rheims leg.; IBSP 1929 • 1 ♂, 1 immature; same locality data as for preceding; V.C. Onofre leg.; IBSP 1928 • 1 ♂, 1 ♀, 2 ♀♀ immatures; same collection data as for preceding; IBSP 1931 • 1 ♂, 1 ♀; same collection data as for preceding; I. Cizauskas leg.; IBSP 1930 • 1 ♀; Bonito ; [-21.128974, -56.481720]; 294 m a.s.l.; 14–23 Oct. 2002; Equipe Biota leg.; IBSP 2592 • 1 ♀; same collection data as for preceding; IBSP 2599 • 1 ♀ immature; same collection data as for preceding; IBSP 2601 • 1 ♂; same collection data as for preceding; IBSP 2605 • 1 ♀; same collection data as for preceding; IBSP 2583 • 1 ♀; same collection data as for preceding; IBSP 2603 • 1 ♂; same collection data as for preceding; IBSP 2602 • 2 ♂♂, 2 ♀♀ immatures; same collection data as for preceding; IBSP 2609 • 1 ♂, 2 ♀♀ immatures; same collection data as for preceding; 16 Jul. 1992; E. Trajano and P. Gnaspini leg; MZSP .

Descriptive notes

MEASUREMENTS. 55–62 body rings (1–2 apodous + telson). Males: body length 45.6–52.5 mm; maximum midbody diameter 2.8–4.1 mm. Females: body length 37.4–42.5 mm; maximum midbody diameter 2.7–3.1 mm.

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

HEAD. Antennae short ( Fig. 123A ), 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 25 ommatidia in 5 rows.

BODY RINGS. Collum with lateral lobes broadly rounded, with ca 8 striae, curved ectad ( Fig. 123A ). 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. 172C ).

FIRST LEG-PAIR OF MALES. Coxae (cx) short (less than half of remaining podomere lengths), subtriangular, densely setose ( Fig. 124A ); prefemoral process (prf) about as wide as half of prefemur, subcylindrical, densely setose up to its median region ( Fig. 124B ); 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. 124C ); prefemur compressed dorsoventrally; remaining podomeres setose.

GONOPODS. Gonocoxa (gcx) elongated, almost twice as long as telopodite, with the base slightly arched; antero-posteriorly flattened ( Fig. 124D–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) subtriangular. Telopodite (tp) as wide as half of gcx ( Fig. 124D ); solenomere (sl) with apicomesal process (amp) short, rounded; ectal process (ep) subtriangular, perpendicular to amp; sa located at mesal portion, visible apically. Internal branch (ib) narrow, foliaceus; almost not surrounding basally tp; ib with setae along its entire margin exceeding apically seminal region of sl ( Fig. 124D–F ).

VULVAE. As typical for the genus. Bursa subtriangular, glabrous ( Fig. 178M ); internal valve subtriangular, with mesal region rounded; operculum slightly curved ectad, expanded apically; external valve wide, subtriangular.

Distribution

Known from the Cerrado biome (tropical savanna ecoregion) on the border of the Brazilian state of Mato Grosso do Sul and the Paraguayan department of Concepción ( Fig. 188 ).

Comments

The type material described by Silvestri (1895b) was not found after consulting the Museo Regionale Scienze Naturali, Torino, Italy (MRSN). Nevertheless, topotypes from surrounding areas in the Apa River were examined ( Fig. 188 ). Other specimens from Apa River in Paraguay were also recorded by Silvestri (1902).

Figures

Fig. 123. Pseudonannolene segmentata Silvestri, 1895, ♂ (IBSP 1931), in lateral view. A. Anterior region. B. Posterior region. Scale bars = 1 mm.

Fig. 124. Pseudonannolene segmentata Silvestri, 1895, ♂ (IBSP 1931). A. First leg-pair. B. Detail of prefemur. C. Second leg-pair. D. Detail of telopodites, in anal view. E. Gonopods, in anal view. F. Gonopods, in oral view. Abbreviations: see Material and methods. Scale bars = 0.5 mm.

Fig. 172. Stereoscopic images of gnathochilarium and anterior sternum of species of Pseudonannolene Silvestri, 1895. A. P. rolamossa Iniesta & Ferreira, 2013. B. P. sebastianus Brölemann, 1902. C. P. segmentata Silvestri, 1895. D. P. silvestris Schubart, 1944. E. P. spelaea Iniesta & Ferreira, 2013. Images not to scale.

Fig. 178. Stereoscopic images of left vulva of species of Pseudonannolene Silvestri, 1895, in oral view. A. P. magna Udulutsch & Pietrobon, 2003. B. P. maritima Schubart, 1949. C. P. mesai Fontanetti, 2000. D. P. microzoporus Mauriès, 1987. E. P. occidentalis Schubart, 1958. F. P. ophiiulus Schubart, 1944. G. P. parvula Silvestri, 1902. H. P. pusilla Silvestri, 1895. I. P. paulista Brölemann, 1902. J. P. robsoni Iniesta & Ferreira, 2014. K. P. rolamossa Iniesta & Ferreira, 2013. L. P. sebastianus Brölemann, 1902. M. P. segmentata Silvestri, 1895. N. P. silvestris Schubart, 1944. O. P. spelaea Iniesta & Ferreira, 2013. 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.