Rhinocricus gauchus, Rodrigues, Patrícia E. S., Ott, Ricardo & Rodrigues, Everton N. L., 2012

Rodrigues, Patrícia E. S., Ott, Ricardo & Rodrigues, Everton N. L., 2012, New species and new records of millipedes of the genus Rhinocricus Karsch, 1881 (Spirobolida: Rhinocricidae) from southern Brazil, Zootaxa 3172, pp. 55-64 : 57-59

Rhinocricus gauchus sp. nov.

( Figs. 8–15 )

Types. Holotype male from São Francisco de Assis, Rio Grande do Sul, Brazil, 25.V.2009, I. Heydrich leg. (MCN 613). Paratypes: three males and three females, same data as the holotype (MCN 736); one male, 25.IV.2009, R. Ott leg. (MCTP 187); one male and one female, 21.VIII.2009, R. Ott leg. (IBSP); one male and one female, 21.VIII.2009, R. Ott leg. (MZUSP).

Etymology. The epithet refers to a term used to designate people from the state of Rio Grande do Sul, a locality with a wide distribution of the species.

Diagnosis. Rhinocricus gauchus is close to Rhinocricus cachoeirensis Schubart, 1944 by the shape of the anterior gonopod ( Fig. 8 ), but differs from R. cachoeirensis by the sternite with straight apex and by the posterior gonopod with non-lamellate and distally rounded solenomere ( Fig. 10 ).

Description. Male, holotype ( Figs. 11, 12 ). With 53 segments. Length 65. Width 6. Clypeus dark-olive with spaced 2–2 supra-labial setae. Labrum yellowish-brown with 11–11 setae. Antennae olive-brown, with numerous sensory cones (around 20). Collum olive-brown with yellowish and ventro-laterally rounded borders. Prozonites light olive-brown; metazonites dark-olive with yellowish borders. Epiproct olive-brown, distally yellowish, rounded and longer than paraproct. Paraproct brown. Hypoproct olive-brown. Legs brown, third and fourth coxae prolonged. Ocelli dark-brown, disposed in six rows, in the following numeric order (dorsal to ventral): 9, 9, 9, 7, 4, 1 right and 9, 9, 9, 7, 5, 1 left. Ozopores black, beginning in the sixth segment. Scobinae starting at seventh segment.

Anterior gonopod ( Figs. 8, 9 ). Sternite with wide base, distal portion short and straight, not surpassing the length of coxite and telepodite. Coxite wide, internal lobe not surpassing the telepodite, which presents a small distal lobe.

Posterior gonopod ( Fig. 10 ). With long solenomere, surpassing the length of the tibiotarsus which presents a rounded distal portion. Tibiotarsus lamellate, rounded externally and with fine internal prolongation.

Female, paratype ( Figs. 13–15 ). As the male unless noted. Length 70. Width 7. Labrum with 10–10 labral setae. Ocelli arranged in six rows in the following numeric order (dorsal to ventral): 8, 9, 8, 7, 6, 3 right and 9, 9, 9, 8, 6, 4 left. Scobinae less conspicuous than in male.

Material examined. BRAZIL, Rio Grande do Sul: Derrubadas, one male, 30.X.2003, R. Ott leg. (MCN 519); Montenegro, one male, 17.XI.1977, M. H. Galileo leg. (MCN 112); one male, 31.VI.1977, A. A. Lise leg. (MCN 041); one male and two females, 12.V.1977, H. Bischoff leg. (MCN 076); one male, 23.XI.1977, M. E. L. Souza leg. (MCN 114); seven males and five females, 19.X-16.XI.2001 (MCN 560); three males, one female and juvenile one, 24.VIII-19.X.2001, all R. Ott & A. Ott leg. (MCN 549); São Borja, one male, 8.XI.1979, H. Bischoff leg. (MCN 149); São Francisco de Assis, one male, 8–13.III.2010, Equipe Projeto Arenização leg. (MCN 616); two males, 27.XI.2009, R. Ott leg. (MCN 617); Tenente Portela, one male, 10.IX.1976, S. Scherer leg. (MCN 050); Triunfo, two males, 19.VI.1977, H. Bischoff leg. (MCN 086); one male, 19.V.1977, A. A. Lise leg. (MCN 067); one male, 15.IX. 1977, M. H. Galileo leg. (MCN 107).

Note. General color of living specimens, dark-olive and metazonite borders yellow ( Fig. 15 )

Distribution. Brazil (State of Rio Grande do Sul).

Figures

FIGURES 15. Rhinocricus gauchus sp. nov. Image of live female in captivity.

FIGURES 8 – 14. Rhinocricus gauchus sp. nov. 8 – 9, anterior gonopod. 8, anterior view. 9, posterior view. 10, right posterior gonopod, anterior view. 11 – 12, male lateral view. 11, posterior segments. 12, anterior segments. 13 – 14, female lateral view. 13, posterior segments. 14, anterior segments. Scale bar = 1.0 mm (Figs. 8 – 10).