Ostinobolus montanus 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 : 93-94

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https://doi.org/ 10.3897/zookeys.19.221

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Ostinobolus montanus Wesener

sp. nov.

Ostinobolus montanus Wesener View in CoL , sp. n.


Material examined: 6 ♂, 2 ♀ Holotype: 1 ♂ (50 mm long), FMMC 8201 , Province Toliara, RNI Andohahela , parcel I, 1875 m, 24°33.7’ S, 46°43.3’ E, camp 5, leg. S. Goodman, 27.XI– 5.12.1995 GoogleMaps . Paratypes: 1 ♂, 2 ♀, FMMC 7971 , RNI Andohahela , parcel I, camp 4, 1500 m, 24°32.2’ S, 46°43.9’ E, leg. S. Goodman, 17–27.XI.1995 GoogleMaps ; 1 ♂, FMMC 13610 , RNI Andohahela , parcel I, camp 3, 1200 m, 24°35.0’ S, 46°44.1’ E, leg. S. Goodman, 7–17.XI.1995, pitfall traps GoogleMaps .

Other material examined: 3 ♂, CAS BLF 5015 (fm057), RNI Andohahela, Col du Sedro, 3.8 km 113° ESE Mahamavo, montane rainforest, 900 m, 24°45’50’’ S, 46°45’6’’ E, leg. B. L. Fisher et al., 21–25.I.2002.

Differential diagnosis: the posterior gonopods of O. montanus sp. n. are unique within the Malagasy Spirobolida ( Figs 51E, G View Figure 51 ). For a comparison of O. stellaris and O. montanus , see above.

Description. Measurements: males with 39 or 40 rings, circa 46–52 mm long (broken), 3.8 mm wide. Females (probably immature) with 40 rings, 4.1 mm wide.

Coloration faded in alcohol. Antennae, legs and body rings ventral of ozopore opening reddish ( Figs 51 View Figure 51 A–C). Head greyish ( Fig. 51A View Figure 51 ). Specimens dorsally with a wide, orange stripe flanked by a wide black area extending up to opening of ozopores. Eyes with circa 25 ocelli arranged in five rows ( Fig. 51A View Figure 51 ). Antennae protruding back to ring 5 ( Fig. 51A View Figure 51 ). Male coxal processes only on coxae 3 and 4, short and conical ( Fig. 51B View Figure 51 ). Preanal process absent ( Fig. 51C View Figure 51 ).

Anterior gonopod sternite with extraordinarily wide shoulders. Lobe triangular, broadly rounded ( Fig. 51D View Figure 51 ). Sternite tip longer than coxite. Coxite and telopodite inconspicuous, processes absent ( Fig. 51F View Figure 51 ).

Posterior gonopods: basal stem slender and elongated, 5.8 times longer than wide ( Fig. 51G View Figure 51 ). Apical part of telopodite oval ( Fig. 51E View Figure 51 ). Inner margin consisting of a thin membranous area; arm-like projections absent (x, y in Fig. 51E View Figure 51 ). Telopodite apically with a large, swollen membranous area. Sperm canal slightly projecting above telopodite margin ( Fig. 51G View Figure 51 ).

Intraspecific variation: too few specimens are known to evaluate the intraspecific variation. The sexual dimorphism in size seems to be less well-developed than in O. rufus .

Distribution and ecology: only known from the Andohahela rainforest north of the Isaka-Ivondro corridor ( Fig. 49 View Figure 49 ). Specimens were collected from 900–1850 m.

Etymology: montanus , adjective, refers to the montane rainforest where this species was collected.


California Academy of Sciences

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