Pseudonannolene scalaris Brölemann, 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 : 79-80

Pseudonannolene scalaris Brölemann, 1902

Figs 119–120 , 187 ; Supp. file 4: Fig. 223A

Pseudonannolene scalaris Brölemann, 1902a: 133 , pl. vi–vii figs 148–153.

Pseudonannolene scalaris – Brölemann 1904: pl. ii fig. 3. — Jeekel 2004: 90.

Diagnosis

Males of P. scalaris differ from those of all other species of the genus by having internal branch contiguous to gonocoxa, without a notch separating both structures ( Fig. 119B–D ); internal branch longer than half of gonocoxa; seminal apophysis located medially ( Fig. 119D ).

Etymology

Although unspecified, the name is probably related to the Latin ‘ scalaris ’ = ‘pertaining to’ or ‘resembling a flight of stairs’ or ‘of a ladder’.

Material examined

Holotype ARGENTINA • ♂ [head and first leg-pair missing]; Buenos Aires, Buenos Aires; [-34.638212, -58.470722]; 25 m a.s.l.; R. von Ihering leg.; MZSP 232 .

Other material (total: 1 ♂, 1 immature)

ARGENTINA – Buenos Aires • 1 ♂ [on microscope slide]; Buenos Aires, Tandil ; [-34.638212, -58.470722]; 25 m a.s.l.; Aug. 1952; MZSP • 1 ♂ immature [on microscope slide]; Balcarce ; [-37.846741, -58.255617]; 123 m a.s.l.; Aug. 1952; MZSP .

Descriptive notes

Anterior region of holotype missing, descriptive notes of anterior body rings, first and second leg-pairs of males adapted from Brölemann (1902a: 133) and from topotype to supplement original description.

MEASUREMENTS. 61 body rings (2 apodous + telson). Males: body length ca 50 mm (without head); maximum midbody diameter 2.6 mm.

COLOR. Body color faded, but apparently prozonites brownish, metazonites with a posterior band brown; legs lighter brown.

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

FIRST LEG-PAIR OF MALES. Coxae (cx) short (less than half of remaining podomere lengths), subtriangular, with the base arched, densely setose mainly on distal region ( Fig. 120D ); prefemoral process (prf) as wide as half of prefemur, subcylindrical; 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. 120C ); prefemur compressed dorsoventrally; remaining podomeres setose.

GONOPODS. Gonocoxa (gcx) as long as the telopodite, square-shaped and abruptly constricted towards apical region, with the base slightly arched ( Fig. 119B–D ); scattered rows of papillae mesally. Seminal groove (sg) arising medially on mesal cavity, curved ectad at midlength of tp and terminating apically on the seminal apophysis (sa). Shoulder absent. Telopodite (tp) elongated ( Figs 119D , 120E–F ); solenomere (sl) with small squamous region; apicomesal process (amp) subtriangular, mesal; ectal process absent; sa located at medial portion, visible apically. Internal branch (ib) elongated and positioned parallel to the tp; contiguous to gcx, without a notch separating both structures; long setae restricted to the apical region of ib exceeding seminal region of sl ( Figs 119D , 120F ).

Distribution

Known only from Buenos Aires, Argentina ( Fig. 187 ).

Figures

Fig. 119. Pseudonannolene scalaris Brölemann, 1902, holotype, ♂ (MZSP 232). A. Posterior region. B. Right gonopod, in oral view. C. Right gonopod, in anal view. D. Detail of telopodites, in anal view. Abbreviations: see Material and methods. Scale bars: A = 1 mm; B–C = 0.5 mm; D = 0.2 mm.

Fig. 120. Pseudonannolene scalarisBrölemann, 1902, ♂ (MZSP). A. Gonopods of immature ♂ mounted on microscope slide. B. Sexual structures of ♂ adult mounted on microscope slide. C. Detail of penis. D. Second leg-pair. E. Gonopods, in anal view. F. Detail of telopodites, in anal view. Abbreviations: see Material and methods. Images not to scale.

Fig. 187. Distribution map of the species Pseudonannolene rocana Silvestri, 1902, P. rolamossa Iniesta & Ferreira, 2013, P. rugosetta Silvestri, 1897, P. scalaris Brölemann, 1902, and P. sebastianus Brölemann, 1902.