Colossobolus giganteus 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 : 28-30

publication ID 10.3897/zookeys.19.221

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Colossobolus giganteus Wesener

sp. nov.

Colossobolus giganteus Wesener View in CoL , sp. n.

Material examined: 5 ♂, 2 ♀, 1 imm. Holotype: 1 ♂ (165 mm long), FMMC 6167 , Madagascar, Province d’Antsiranana, RS d’Ankarana, Grotte des Chauves Souris , 3 km NW Mahamasina, 80 m, dry forest, 12°58’05.7’’ S, 049°07’09.6’’ E, leg. S. M. Goodman, 12.V.2003 GoogleMaps . Paratypes: 3 ♂, 1 ♀, 1 imm., FMMC 3920 , RS Ankarana, 80 m, tropical dry forest, 12°54’32’’ S, 49°6’35’’ E, leg. B. L. Fisher et C. Griswold, 10–16. II.2001 GoogleMaps ; 1 ♂, 1 ♀, MNHN noNumber, Province Diego-Suarez (Antsiranana), Rivière des Bois Pourris , Réc. A. Treha, 13.VII.1960 .

Differential diagnosis: the gonopods of C. giganteus are so unique that they can only be confused with C. oblongopedus . See C. oblongopedus for a comparison of the two species.

Description. Measurements: males with 52 or 53 body rings, up to 165 mm long, 10.0–12.0 mm wide. Females with 52 body rings, of unknown length (broken), 10.3– 15.5 mm wide.

Coloration affected by alcohol. Head, antennae, legs and telson red. Collum centrally dark ( Fig. 15A View Figure 15 ). Meso- and metazonites of body rings reddish-brown. Antennae protruding back to ring 4. Male coxal processes on coxae 3 and 4 weakly developed, on coxae 5–7 short, barely visible ( Fig. 15B View Figure 15 ). Preanal process well-rounded, not projecting.

Anterior gonopod sternite elongated into a wide, broadly rounded lobe. Apical part of lobe slightly more slender than remaining part ( Fig. 15C View Figure 15 ). Mesal process of coxite weakly developed, protruding into a short, wide lobe with a pointed tip ( Fig. 15C View Figure 15 ). Telopodite process long and well-rounded, basally at mesal margin with a minute, but sharp, lateral retrorse projection ( Fig. 15D View Figure 15 ). Mesal margin laterally sharp-edged, not protruding ( Fig. 15D View Figure 15 ).

Posterior gonopod telopodites positioned parallel to one another. Coxite branch long, wide and stout, almost as long as lateral branch of telopodite ( Figs 15E, F View Figure 15 ). Lat-

ter not tapering, apically slightly curved mesally ( Fig. 15F View Figure 15 ). Central membranous area present as a short, wide, well-rounded lobe ( Fig. 15E View Figure 15 ). Main branch shorter than lateral branch, both running parallel. Apical part of main branch extending towards and touching lateral branch ( Fig. 15E View Figure 15 ). Inner margin of main branch with two very small, well-rounded, overlapping membranous folds. Main branch laterally with a very large irregularly shaped membrane ( Fig. 15E View Figure 15 ).

Intraspecific variation: the specimens from the MNHN of unknown locality are 3–5 mm more slender than those from Ankarana.

Distribution and ecology: C. giganteus is only known from the dry forest of Ankarana ( Fig. 10 View Figure 10 ). The sample from the unknown locality from the MNHN suggests that C. giganteus has or had a wider distribution.

Etymology: giganteus , adjective, refers to the large size of the species. Colossobolus giganteus at 165 mm is the largest known species of the genus and one of the largest millipedes known from Madagascar.


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