Pseudonannolene scalaris Brölemann, 1902

Pseudonannolene scalaris Brölemann, 1902 View in CoL

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

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

Pseudonannolene scalaris View in CoL – 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 View Fig ); internal branch longer than half of gonocoxa; seminal apophysis located medially ( Fig. 119D View Fig ).

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 View Materials . GoogleMaps

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 GoogleMaps • 1 ♂ immature [on microscope slide]; Balcarce ; [ -37.846741, -58.255617]; 123 m a.s.l.; Aug. 1952; MZSP GoogleMaps .

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 View Fig ); 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 View Fig ); 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 View Fig ); 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 View Fig , 120E–F View Fig ); 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 View Fig , 120F View Fig ).

Distribution

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