Pseudonannolene rocana Silvestri, 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 : 76-77

Pseudonannolene rocana Silvestri, 1902

Figs 115–116 , 187

Pseudonannolene rocana Silvestri, 1902: 21 .

Pseudonannolene auguralis Silvestri, 1902: 21 . Syn. nov.

Pseudonannolene rocana – Jeekel 2004: 90. — Iniesta & Ferreira 2013a: 92; 2013b: 366. Pseudonannolene auguralis – Jeekel 2004: 88. — Iniesta & Ferreira 2013a: 92; 2013b: 366.

? Pseudonannolene rocana – Mauriès 1987: 175, figs 11–13 (description of specimens from Montevideo, Uruguay, Apr. 1947, Reinhardt leg.).

Justification of synonymy

Both nominal species present complete agreement when considering the morphology of the gonopod, mainly the stout and elongated telopodite, short squamous region of solenomere, and seminal apopohysis in medial portion.

Diagnosis

Males of P. rocana resemble those of P. alegrensis by having an elongated telopodite (longer than half of gonocoxa), but differing by having solenomere short ( Fig. 116C–D ); rounded coxae of the first leg-pair ( Fig. 116A ); and by the absence of projections bearing setae on the paraproct ( Fig. 115B ).

Etymology

Although unspecified, the name is probably referring to the locality where the type material was found, Rocha, southeastern Uruguay.

Material examined (total: 8 ♂♂, 21 ♀♀)

URUGUAY – Montevideo • 6 ♀♀; [-34.901076, -56.164503]; 38 m a.s.l.; Apr. 1947; Reinhardt leg.; NHMD • 8 ♂♂, 15 ♀♀; same locality data as for preceding; Exp. Galathea leg.; NHMD .

Descriptive notes

MEASUREMENTS. 50–60 body rings (1–2 apodous + telson). Males: body length 20–28 mm; maximum midbody diameter 1.2–1.7 mm. Females: body length 22–34 mm; maximum midbody diameter 1.3– 1.8 mm.

COLOR. Body color faded, but apparently, prozonites brownish, metazonites with a posterior band lighter; head, collum, antennae, and legs lighter.

HEAD. Antennae short ( Fig. 115A ), 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 23 ommatidia in 4 rows.

BODY RINGS. Collum with lateral lobes rounded, with ca 6 shallow striae ( Fig. 115A ). Very faintly constricted between prozonite and metazonite; prozonites smooth; metazonites laterally with transverse striae from ca ⅓ length below ozopore. Anterior sterna in midbody rings subrectangular, without transverse striae.

FIRST LEG-PAIR OF MALES. Coxae (cx) elongated (as long as the sum of remaining podomere lengths), laterally rounded and with the base arched, densely setose ( Fig. 116A ); prefemoral process (prf) as wide as half of prefemur, subcylindrical, densely setose up to its median region; remaining podomeres with setae along the mesal region.

SECOND LEG-PAIR OF MALES. Coxa (cx) rounded; penis (pn) located at proximal region, rounded, not extended basally ( Fig. 116B ); prefemur compressed dorsoventrally; remaining podomeres setose.

GONOPODS. Gonocoxa (gcx) subcylindrical, expanded medially, with the base slightly arched; antero-posteriorly flattened ( Fig. 116C–D ); with rows of papillae mesally. Seminal groove (sg) curved; protruded basally on trunk of telopodite, terminating apically on the seminal apophysis (sa). Shoulder absent. Telopodite (tp) stout, longer than half of gcx, slightly curved mesad; solenomere (sl) with small squamous region, but expanded laterad; apicomesal process (amp) short; ectal process absent; sa located at medial portion, slightly visible apically. Internal branch (ib) short, shovel-shaped, nearly not covering tp basally in anal view; long setae restricted to the apical region of ib ( Fig. 116C–D ).

VULVAE. As typical for the genus. Bursa subtriangular, glabrous; internal valve subtriangular, with mesal region rounded; operculum narrow; external valve wide, subtriangular.

Distribution

Known only from southern and southeastern Uruguay ( Fig. 187 ).

Comments

Type material of P. rocana and P. auguralis described by Silvestri (1902) was not found after consulting the museums where the species were supposedly deposited (see Mauriès 1987). Additionally, Viggiani (1973) did not list either species according to material described by Silvestri. Nevertheless, topotypes described by Mauriès (1987) and deposited at the NHMD were examined ( Fig. 115 ).

Figures

Fig. 115. Pseudonannolene rocana Silvestri, 1902, ♂ (NHMD), in lateral view. A. Anterior region. B. Posterior region. Scale bars = 1 mm.

Fig.116.PseudonannolenerocanaSilvestri,1902, ♂(NHMD).A. Firstleg-pair.B. Secondleg-pair.C. Gonopods, in anal view. D. Gonopods, in oral view.Abbreviations: see Material and methods. Scale bars = 0.5 mm.

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.