Riotintobolus anomalus Wesener, 2009

Wesener, Thomas, Enghoff, Henrik & Sierwald, Petra, 2009, Review of the Spirobolida on Madagascar, with descriptions of twelve new genera, including three genera of ' fire millipedes' (Diplopoda), ZooKeys 19 (19), pp. 1-128 : 55-56

publication ID 10.3897/zookeys.19.221

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Riotintobolus anomalus Wesener

sp. nov.

Riotintobolus anomalus Wesener View in CoL , sp. n.

Material examined: Holotype: 1 ♂ (45 mm long), CAS BLF 5499 , Madagascar, Province Toliara, Réserve Spéciale de Cap Sainte Marie , 12.3 km 262°W Marovato, spiny forest thicket, 200 m, 25°34’54” S, 45°10’6” E, leg. Fisher, Griswold et al., pitfall trap, 11–15.II.2002 GoogleMaps . Paratypes:>25 ♂ and ♀, CAS BLF 5499 , same data as previous GoogleMaps ; 2 ♂, 3 ♀, CAS BLF 5651 , same data as previous, but 160 m, 25°35’40” S, 45°8’49” E, leg. Fisher, Griswold et al., malaise trap, 13–19.II.2002 GoogleMaps .

Other material examined: 1 ♀, CAS BLF 5503 , Réserve Spéciale de Cap Sainte Marie , spiny forest thicket, 200 m, 25°34’54” S, 45°10’6” E, leg. Fisher, Griswold, et al., 11–15.II.2002 GoogleMaps ; 1 ♂, CAS BLF 5758 , Madagascar, Province Toliara, Mahafaly Plateau , 6.2 km 74°ENE Itampolo, spiny forest thicket, 80 m, 24°39’13” S, 43°59’48” E, leg. Fisher, Griswold et al., sifted litter, 21–25.II.2002 GoogleMaps ; 2 ♂, CAS BLF 5762 , same data as previous, but hand collecting GoogleMaps ; 13 ♂, 6 ♀, CAS BLF 5763 , same data as previous, but pitfall trap GoogleMaps ; 1 ♂, MNHN, Madagascar, leg. Petit, 24–1922, envoi vi, entrée 24–1922 ; 1 ♂, CASENT 9032805 , Province Toliara, Lake Ranobe , spiny forest, 30 m, 23°2.941’ S, 43°36.635’ E, leg. Frontier Wilderness Project, 21–28.I.2003 GoogleMaps .

Differential diagnosis: R. anomalus is the only known species of Riotintobolus where a sharp-edged preanal process and well-developed lips are absent. Furthermore it is the only species with male tarsal pads on every leg pair. The gonopods of this species are distinct but in some aspects similar to those of R. mandenensis and R. minutus .

Description. Measurements: male holotype with 45 podous and no apodous rings, circa 45 mm long (broken), 4.3 mm wide. Females with 44 or 45 body rings and no apodous ring, up to 51 mm long, 4.6 mm wide.

Coloration light grey with darker posterior margins. Openings of ozopores highlighted with a black spot. Collum and rings dorsally with an extraordinary wide bloodred or rust-red stripe. Antennae and legs dark grey. Eyes with 30–34 ocelli arranged in five rows. Antennae short, protruding in both sexes back to body ring 2 ( Fig. 29B View Figure 29 ). Legs reach 0.7 times body diameter, tarsi 3 and beyond in males with tarsal pads ( Fig. 29C View Figure 29 ). Preanal process absent, not protruding ( Fig. 29A View Figure 29 ). Anal valves small, lips weakly developed ( Fig. 29A View Figure 29 ).

Anterior gonopod sternite apically swollen into a wide lobe with a triangular, wellrounded tip ( Fig. 29D View Figure 29 ). Sternite tip almost as high as mesal coxite process, latter long, relatively slender, longer than sternite ( Fig. 29D View Figure 29 ). Telopodite on posterior side apically with a large triangular retrorse process ( Fig. 29E View Figure 29 ), projecting above coxite and telopodite margins ( Fig. 29E View Figure 29 ).

Posterior gonopods telopodite laterally with a single, large, finger-shaped process ( Fig. 29F View Figure 29 ). Sperm canal discharging into process. Apically, a large membrane present, which extends into two lobes, apically twice as wide as basally ( Fig. 29G View Figure 29 ).

Intraspecific variation: no variation inside or in between the Mahafaly and Cap Sainte Marie populations was observed.

Distribution and ecology: this species is currently known from the Mahafaly plateau, the Cap Sainte Marie, and a third, distant location at the Lake Ranobe. All localities are probably the driest places on Madagascar ( Battistini 1972, Moat & Smith 2007).

Etymology: anomalus , adjective, refers to the unusual (for Riotintobolus ) telson of the species.


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