Pseudonannolene curvata, Iniesta & Bouzan & Brescovit, 2023

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 : 103-105

Pseudonannolene curvata sp. nov.

urn:lsid:zoobank.org:act:789F5690-028D-4681-9025-41E7D902A7E6

Figs 151–152 , 175C , 179L , 190

Diagnosis

Males of P. curvata sp. nov. resemble those of P. mesai , P. erikae , and P. bucculenta sp. nov. by having mesally curving telopodite ( Fig. 152D ). Pseudonannolene curvata differs from P.erikae and P. bucculenta by having the prefemoral process digitiform and larger than half of the prefemur ( Fig. 152B ), and from P. mesai by a narrow trunk of telopodite ( Fig. 152D–F ).

Etymology

The species epithet is derived from the Latin adjective ‘ curvatus ’ = ‘curved, bent’; in reference to the curved telopodites.

Material examined

Holotype BRAZIL • ♂; Rio Grande do Sul, Santana do Livramento, APA Cerrito ; [-30.877251, -55.538789]; 208 a.s.l.; 10 Dec. 2012; R. Ott leg.; MCN.

Paratypes (total: 2 ♂♂, 2 ♀♀) BRAZIL • 2 ♂♂; same collection data as for holotype; MCN • 2 ♀♀; same collection data as for holotype; MCN .

Referred non-type material (total: 13 ♂♂, 8 ♀♀; 3 immatures)

BRAZIL – Rio Grande do Sul • 6 ♂♂, 2 ♀♀, 3 immatures; Santana do Livramento, APA Cerrito ; [-30.877251, -55.538789]; 208 m a.s.l.; 10 Dec. 2012; R. Ott leg.; MCN • 4 ♀♀; same collection data as for preceding; IBSP 7877 • 2 ♀♀; same collection data as for preceding; IBSP 7878 • 5 ♂♂; same collection data as for preceding; IBSP 7879 .

URUGUAY – Salto • 1 ♂; Arapey River ; [-31.147443, -56.882060]; 98 m a.s.l.; 20 Dec. 1954; FCE 433 . – Tacuarembó • 1 ♂; Laureles, Puntas de Arroio , Rincón de la Vasoura; [-31.362767, -55.882940]; 147 m a.s.l.; 20 Jan. 1960; FCE 343 .

Description

MEASUREMENTS. 51–56 body rings (1–2 apodous + telson). Males: body length 33.4–40.6 mm; maximum midbody diameter 2.3–2.4 mm. Females: body length 45.4–49.9 mm; maximum midbody diameter 3.1–3.5 mm.

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

HEAD. Antennae short ( Fig. 151A ), just reaching back to end of ring 5 when extended dorsally; relative antennomere lengths <2<3>4≈5≈6>7. Mandibular cardo with ventral margin swollen. Ommatidial cluster well-developed, elliptical; ca 25 ommatidia in 4 rows.

BODY RINGS. Collum with lateral lobes rounded, with ca 6 striae ( Fig. 151A ). 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. 175C ).

FIRST LEG-PAIR OF MALES. Coxae (cx) short (less than half of remaining podomere lengths), subtriangular, with the base arched and expanded, densely setose ( Fig. 152A ); prefemoral process (prf) as wide as half of prefemur, subcylindrical, densely setose along the entire ventral region ( Fig. 152B ); remaining podomeres with setae along the mesal region.

SECOND LEG-PAIR OF MALES. Coxa (cx) as long as the sum of remaining podomere lengths, rounded; penis (pn) located at proximal region, rounded, slightly constricted basally ( Fig. 152C ); 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. 152D–F ); with rows of papillae mesally. Seminal groove (sg) curved mesad; running mesally and terminating apically on the seminal apophysis (sa). Shoulder (sh) elongated, subtriangular. Telopodite (tp) almost as wide as gcx ( Fig. 152D ), strongly curved mesad; solenomere (sl) with apicomesal process (amp) rounded; ectal process absent; sa located at mesal portion, protruded apically. Internal branch (ib) shovel-shaped and rounded apically; setae restricted to the apical region of ib not exceeding seminal region of sl ( Fig. 152D–F ).

VULVAE. As typical for the genus. Bursa subtriangular, glabrous ( Fig. 179L ); internal valve subtriangular; operculum narrow, curved ectad; external valve subtriangular.

Distribution

Known from the border of the Brazilian state of Rio Grande do Sul, northern Uruguay, and Argentina ( Fig. 190 ).

Figures

Fig. 151. Pseudonannolene curvata sp. nov., holotype, ♂ (MCN), in lateral view. A. Anterior region. B. Posterior region. Scale bars = 1 mm.

Fig. 152. Pseudonannolene curvata sp. nov., holotype, ♂ (MCN). 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, E–F = 0.5 mm; B, D = 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. 179. Stereoscopic images of left vulva of species of Pseudonannolene Silvestri, 1895, in oral view. A. P. strinatii Mauriès, 1974. B. P. tocaiensis Fontanetti, 1996. C. P. tricolor Brölemann, 1902. D. P. typica Silvestri, 1895. E. P. xavieri Iniesta & Ferreira, 2014. F. P. bucculenta sp. nov. G. P. morettii sp. nov. H. P. insularis sp. nov. I. P. nicolau sp. nov. J. P. granulata sp. nov. K. P. alata sp. nov. L. P. curvata sp. nov. M. P. aurea sp. nov. Images not to scale.

Fig. 190. Distribution map of the speciesPseudonannolene alata sp. nov.,P. aureasp. nov., P. bucculenta sp. nov., P. curvata sp. nov., and P. granulata sp. nov.