Pseudonannolene borelli 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 : 25-26

Pseudonannolene borelli Silvestri, 1895

Figs 50 , 180

Pseudonannolene borelli Silvestri, 1895b: 7 , fig. 12.

Pseudonannolene borelli – Silvestri 1897b: 8; 1902: 22 (description of specimens from Areguá, Central, Paraguay). — Viggiani 1973: 366. — Jeekel 2004: 88.

Diagnosis

Males of P. borelli slightly resemble those of P. longicornis and P. tricolor by having gonopod with subcylindrical gonocoxa, but differing by an internal branch with long setae restricted to the apical margin and the solenomere with a large trunk ( Silvestri 1895b: 7, fig. 12; Fig. 50E ).

Etymology

Patronym honoring the collector Dr Alfredo Borelli ( Silvestri 1895b).

Material examined (total: 1 ♀)

PARAGUAY – Central • 1 ♀; Areguá ; [-25.303669, -57.412255]; 157 m a.s.l.; 11 Oct. 1900; A. Borelli leg.; USNM 2389 .

Descriptive notes

Gonopod description adapted from Silvestri (1895b: 7) to supplement original description and to introduce gonopod terminology. Non-sexual characters described as female.

MEASUREMENTS. 68 body rings (1 apodous + telson). Females: body length ca 60 mm; maximum midbody diameter 3 mm.

COLOR. Strongly faded because of long preservation in ethanol, but apparently metazonites with a brownish posterior band; head, antennae, and legs lighter brownish.

HEAD. Antennae short ( Fig. 50A ), 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 32 ommatidia in 5 rows.

BODY RINGS. Collum broken. Very faintly constricted between prozonite and metazonite; prozonites smooth; metazonites laterally with transverse striae. Anterior sterna in midbody rings subrectangular, without transverse striae.

GONOPODS. Gonocoxa (gcx) elongated, almost twice as long as telopodite, subrectangular; flattened antero-posteriorly; with rows of papillae mesally. Seminal groove (sg) terminating apically on the seminal apophysis (sa). Shoulder (sh) inconspicuous. Telopodite (tp) as wide as half of gcx; solenomere (sl) with apicomesal process (amp) subtriangular; ectal process (ep) subtriangular, separated from amp by shallow notch; sa located at mesal portion. Internal branch (ib) shovel-shaped, slightly curved apically; setae restricted to the apical region of ib exceeding seminal region of sl ( Fig. 50E ).

Distribution

Known from Chaco in southwestern Paraguay; other records from the literature for Argentina and Bolivia ( Fig. 180 ).

Comments

The type material described by Silvestri (1895b) was not found after consulting the Museo Regionale Scienze Naturali, Torino, Italy (MRSN). Nevertheless, a female topotype (USNM 2389) originally identified by Silvestri (but erroneously referenced as a paratype in its original label) was examined ( Fig. 50A–D ). Other specimens from Argentina (Santa Fé), Bolivia (Potosí and Tajira), and Paraguay (Asunción) were recorded by Silvestri (1897b, 1902).

Figures

Fig. 50. Pseudonannolene borelli Silvestri, 1895, topotype, ♀ (USNM 2389). A. Head in lateral view. B. Posterior region. C. Original label of topotype (erroneously labeled as paratype by F. Silvestri). D. Gnathochilarium in ventral view. E. Schematic drawing of left gonopod in anal view (modified from Silvestri 1895b: fig. 12). Abbreviations: see Material and methods. 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.