Rhaucus serratus (Roewer, 1912) Pinzón-M & Pinto-Da-Rocha, 2024

Pinzón-M, Conchita & Pinto-Da-Rocha, Ricardo, 2024, Two new species of Rhaucus Simon, 1879 reveal putative synapomorphies related to the microstructural morphology of male genitalia (Opiliones: Cosmetidae), Zootaxa 5555 (1), pp. 35-56 : 48-49

Rhaucus serratus (Roewer, 1912) New Combination

( Figs 9 , 10C , 12 )

Meterginus serratus Roewer, 1912b: 106 , Fig. 17, pl. 1, Fig. 10 ; García and Damron, 2019: 7, 8, Fig. 8 C–D .

Type Material: Ecuador, Chimborazo, Riobamba : 1 male and 1 female ( SMF 296, examined by photos) .

Other Examined Material: Ecuador, Napo, Jatun Sacha Biological Station : 1 male ( IBSP 16524 ), 1°3’57.5’’S, 77°37’0.2’’W. C.A. Rheims leg. 1–5/XII/2009 .

Diagnosis: ( Fig. 9 ) Femur III and IV with two ventral rows of strong, denticle-shaped tubercles, similar to R. artifex sp. nov. and R. papilionaceus (other species have robust, conical, blunt tubercles). The color pattern on the dorsal scutum (DS) forms a patch that crosses the body transversely on groove I and mostly extends laterally towards the prosoma and abdomen, without reaching the posterior areas (in R. artifex sp. nov., some patches appear between areas III and IV, and in R. papilionaceus , the patches on the DS surround tubercles in area I).

Penis: See García and Damron (2019).

Distribution of the species herein treated

The species R. artifex sp. nov. and R. gaiterus sp. nov. represent the lowest altitudinal records for Rhaucus in Colombia, being found between 200–500 m a.s.l. Both species inhabit sub-humid forests with alternating periods of rain and drought, but with constant moisture resources. In contrast, the reclassification of R. serratus comb. nov. extends the distribution of Rhaucus into the Andean mountains of Ecuador (see Fig. 12 ).

Figures

FIGURE 8. Rhaucus marmoratus comb. nov. (ICN-Ar-1659) A. Male. Habitus, dorsal view; B. Female. Habitus, dorsal view; C–F. Penis: C. Dorsal view; D. Ventral view, arrow showing the areolated MS B.; E–F. Lateral view. Scales: 0.05 mm. Micrographs C–F. Courtesy of B. N. Damrom.

FIGURE 9. Rhaucus serratus comb. nov. (IBSP 16524). Habitus, dorsal view.

FIGURE 10. Prosoma, detail of the scent gland opening. A. Rhaucus quinquelineatus (MUSENUV-Ar-1770); B. Rhaucus serripes (MUSENUV-Ar-1774); C. Rhaucus serratus comb. nov. (IBSP 16524); D. Rhaucus marmoratus comb. nov. (ICN- Ar-1659).

FIGURE 12. Distribution map of Rhaucus spp.