Rupidesmus Schubart, 1952

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: 590-591

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Rupidesmus Schubart, 1952


Genus Rupidesmus Schubart, 1952 

Rupidesmus Schubart, 1952: 447  –454. Type species: Rupidesmus ruber Schubart, 1952  , by original designation. Hoffman, 1980: 155.

Genus diagnosis: Males of Rupidesmus  differ from those of other chelodesmid genera by the combination of the following characters. A pair of ventral projections present on the sternite of the fifth body ring ( Figs 5D View Figure , 6D View Figure ), as also noted in Leptodesmini  (Leptodesmus DeSaussure s. str., Drepanodesmus Hoffman  and Dialysogon Hoffman  ), where they are present on sternites of fourth and sometimes sixth body ring. Legs with a rounded ventral-apical process on the prefemur and an acute apical-ventral membranous projection on the tibia ( Figs 5C View Figure , 6A–C View Figure ), as in Sandalodesmus Silvestri  ( Sandalodesmini  ) and Leptodesmini  . Male gonopodal characters: prefemoral process dagger-shaped; notably shortened, about 1/3 of the length of the acropodite ( Fig. 4D View Figure ). Massive acropodite with a conspicuous indentation in the posterior margin (visible in mesal view; Figs 3A, D View Figure , arrows). The reduction of the prefemoral process is also present in some species belonging to genus Obiricodesmus Schubart  ( Cornalatini  ), but with a shorter acropodite than in Rupidesmus  .

Genus description: General characters: Body length between 60.6 mm ( R. ruber  ) and 72.5 mm ( R. aclys  n. sp.). Coloration (specimens long preserved in 70% ethanol) variable between species, ranging from reddish to light brown. Head ( Fig. 1A View Figure ) with row of around 50 labral setae, 30 clypeo-labral setae and 10 clypeal setae ( Fig. 1B View Figure ), shape of the incisura lateralis suboval ( Fig. 1C View Figure ). Antennae: seventh antennomere with two large invaginations between the two pairs of apical sense cones ( Figs 1D–E View Figure ). Body rings: integument smooth, without setae. Collum: anterior border arched and posterior border slightly concave ( Figs 2A, D View Figure ). Stigma oval. Sternite of fifth body ring with a pair of ventral projections ( Figs 5D View Figure , 6D View Figure ). Ozopore situated on posterior edge of paranota. Ozopore arrangement: 5, 7, 9, 10, 12, 13, 15–19 (following the normal polydesmidan pore formula); ozopores surrounded by peritremata. Paranota: prominent and long, wide and nearly horizontal, straight on posterolateral sides, covering part of the legs, without setae on the edges. Paranota form: anterior corners rounded, posterior edges sub-triangular ( Figs 2B, E View Figure ). Legs: with rounded ventro-apical process on the prefemur and with acute apical-ventral membranous projection on the tibia ( Figs 5C View Figure , 6A–C View Figure ), these structures are present in all pairs except the last. Telson: triangular ( Figs 2C, F View Figure ), with five pairs of macrosetae on the dorsal side and two pairs (spinnerets) in the apical region.

Male characters: Gonopore: located on the coxae of the second leg-pair, coxae rectangular, with an apical pore. Gonopod aperture on seventh body ring: transversely oval, large; posterior edge without folds ( Figs 5E View Figure , 6E View Figure ). Gonopods: gonopod coxae ( Figs. 4A, B View Figure ) prominent, equivalent to about half the length of the telopodite, with a large spiniform process ( Fig. 4C View Figure ). Cannula ( Fig. 4A View Figure ): hook-shaped. Prostatic groove ( Fig. 4A View Figure ): runs almost entire length of acropodite along mesal side. Telopodite ( Fig. 4A View Figure ): elongate and inclined, divided into prefemoral region and acropodite region ( Fig. 4A View Figure ). Prefemoral process: shorter (about 1/3 of the length of the acropodite), stout and shape resembling a dagger ( Fig. 4D View Figure ). Acropodite robust with an indentation at the posterior margin and ending in acute apex ( Fig. 4F View Figure ).

Female characters: Known only for R. ruber  . Cyphopods: oval-shaped, situated directly behind the second pair of legs on the third body ring; composed of three valves, all well-covered with setae; two valves joined by a membrane, with a third apically, appressed against both larger valves ( Figs 5A–B View Figure ).

Distribution: Known only from the state of Minas Gerais, Brazil, occurring in the limestone karst area of the Bambui Group and the “Iron Quadrangle” (Quadrilátero Ferrífero) iron-ore area ( Fig. 7 View Figure ).

Composition: Rupidesmus ruber Schubart, 1952  and R. aclys  n.sp.












Rupidesmus Schubart, 1952

Bouzan, Rodrigo Salvador, Iniesta, Luiz Felipe M. & Brescovit, Antonio Domingos 2018



: 447 : 155