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

publication ID

https://doi.org/ 10.11646/zootaxa.4434.3.12

publication LSID

lsid:zoobank.org:pub:EC53AE9C-5516-4172-9DB2-D7C5E47A87E3

DOI

https://doi.org/10.5281/zenodo.5973731

persistent identifier

https://treatment.plazi.org/id/A7681F51-AE16-6B79-CD8C-4A5488D85B39

treatment provided by

Plazi

scientific name

Rupidesmus Schubart, 1952
status

 

Genus Rupidesmus Schubart, 1952 View in CoL

Rupidesmus Schubart, 1952: 447 View in CoL –454. Type species: Rupidesmus ruber Schubart, 1952 View in CoL , 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 5 , 6D View FIGURE 6 ), 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 5 , 6A–C View FIGURE 6 ), 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 4 ). Massive acropodite with a conspicuous indentation in the posterior margin (visible in mesal view; Figs 3A, D View FIGURE 3 , 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 1 ) with row of around 50 labral setae, 30 clypeo-labral setae and 10 clypeal setae ( Fig. 1B View FIGURE 1 ), shape of the incisura lateralis suboval ( Fig. 1C View FIGURE 1 ). Antennae: seventh antennomere with two large invaginations between the two pairs of apical sense cones ( Figs 1D–E View FIGURE 1 ). Body rings: integument smooth, without setae. Collum: anterior border arched and posterior border slightly concave ( Figs 2A, D View FIGURE 2 ). Stigma oval. Sternite of fifth body ring with a pair of ventral projections ( Figs 5D View FIGURE 5 , 6D View FIGURE 6 ). 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 2 ). Legs: with rounded ventro-apical process on the prefemur and with acute apical-ventral membranous projection on the tibia ( Figs 5C View FIGURE 5 , 6A–C View FIGURE 6 ), these structures are present in all pairs except the last. Telson: triangular ( Figs 2C, F View FIGURE 2 ), 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 5 , 6E View FIGURE 6 ). Gonopods: gonopod coxae ( Figs. 4A, B View FIGURE 4 ) prominent, equivalent to about half the length of the telopodite, with a large spiniform process ( Fig. 4C View FIGURE 4 ). Cannula ( Fig. 4A View FIGURE 4 ): hook-shaped. Prostatic groove ( Fig. 4A View FIGURE 4 ): runs almost entire length of acropodite along mesal side. Telopodite ( Fig. 4A View FIGURE 4 ): elongate and inclined, divided into prefemoral region and acropodite region ( Fig. 4A View FIGURE 4 ). Prefemoral process: shorter (about 1/3 of the length of the acropodite), stout and shape resembling a dagger ( Fig. 4D View FIGURE 4 ). Acropodite robust with an indentation at the posterior margin and ending in acute apex ( Fig. 4F View FIGURE 4 ).

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 5 ).

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 7 ).

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

Kingdom

Animalia

Phylum

Arthropoda

Class

Diplopoda

Order

Polydesmida

Family

Chelodesmidae

Loc

Rupidesmus Schubart, 1952

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

Rupidesmus

Schubart, 1952 : 447
Hoffman, 1980 : 155
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF