Rupidesmus aclys,

Bouzan, Rodrigo Salvador, Iniesta, Luiz Felipe M. & Brescovit, Antonio Domingos, 2018, A review of the millipede genus Rupidesmus Schubart, 1952 (Polydesmida: Chelodesmidae), Zootaxa 4434 (3), pp. 589-599: 593

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Rupidesmus aclys

new species

Rupidesmus aclys  new species

Figures 2D –FView FIGURE 2, 3D –FView FIGURE 3, 6View FIGURE 6

Type material. Male holotype from Fazenda Izabela Hendri , Sabará (43°49'34.29"W, 19°53'4.26"S), Minas Gerais, Brazil, 06.XI.2008, J.P.P. Pena-Barbosa coll., IBSP 2890View Materials.GoogleMaps 

Diagnosis. Adults males of Rupidesmus aclys  n. sp. differ from R. ruber  based on combination of gonopodal characteristics: Prefemoral process directed parallel to acropodital branch ( Fig. 3DView FIGURE 3). Prostatic groove softened and S-shaped along the acropodite, ending upon an elongated prostatic apex ( Fig. 3DView FIGURE 3). Indention restricted to posterior margin. Presence of an acute acropodital process in ectal view ( Fig. 3FView FIGURE 3).

Description. Male (Holotype, IBSP 2890). Coloration (long-preserved in 70% ethanol): Head reddish brown with a light brown labrum. Antennae light reddish brown with seventh antennomere yellow. Body reddish brown and paranota tip with the same color as the body ( Figs 2D –FView FIGURE 2). Body rings: cuticle smooth; paranota with posterior edges sub-rectangular ( Fig. 2EView FIGURE 2); ozopore posteriorly situated on paranota. Stigma oval. Sternite of body ring 5 with a pair of elongated projections ( Fig. 6DView FIGURE 6). Pair of legs on body ring 3 with coxae possessing a rectangular-shaped genital papilla, and pairs of legs on body rings 5 to 17 with two pairs of rounded projections between coxae ( Fig. 6FView FIGURE 6, arrows). Gonopod aperture on seventh body ring ( Fig. 6EView FIGURE 6) elliptical, posterior edge without folds. Legs whitish red, with rounded ventro-apical process on the prefemur and an acute apical-ventral membranous projection on the tibia ( Figs 6A –CView FIGURE 6), leg modifications present in all pairs except the last. Telson with the same color as the body. Total length: 72.5 (Fragmented). Collum 3.07 long, 8.11 wide. Antennomere lengths (1>7): 0.94; 1.93; 1.72; 1.71; 1.83; 1.75; 0.47. Gonopod aperture 1.99 long, 3.05 wide. Telson 2.06 long.

Gonopods ( Figs 3D –FView FIGURE 3): coxae equivalent to about half the length of the telopodite and prominent in ectal view ( Fig. 3FView FIGURE 3). Coxae with two setae on the distal dorsal side and with four setae on distal ventral side. Presence of a spiniform process hidden by the coxa in mesal view (SP; Fig. 3EView FIGURE 3). Cannula: hook-shaped. Prostatic groove softened and S-shaped. Prefemoral region ventrally developed and short, 1/4 length of telopodite. Prefemoral process small and directed parallel to acropodital branch (PfP; Fig. 3DView FIGURE 3). Acropodite elongated and robust (A; Fig. 3DView FIGURE 3); conspicuous indentation restricted to posterior margin of the telopodite ( Fig. 3DView FIGURE 3, arrow). Acropodite apex, in ectal view, with an acute acropodital process (AP; Figs 3D, FView FIGURE 3). The posterior edge of apical region ends in a pointed tip ( Figs 3D –FView FIGURE 3).

Female. Unknown.

Distribution. The species is known only from the type locality.

Etymology. The species epithet is a noun in apposition, from the Latin word aclys  meaning “short lance”. The name refers to the shape of the small prefemoral process on the gonopod.


Instituto Biologico de Sao Paulo