Colossobolus oblongopedus 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 : 26-28

publication ID 10.3897/zookeys.19.221

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Colossobolus oblongopedus Wesener

sp. nov.

Colossobolus oblongopedus Wesener View in CoL , sp. n.

Material examined: 9 ♂, 3 ♀ Holotype: 1 ♂ (126 mm long), CAS BLF 9429 B, Madagascar, Province Antsiranana, Forêt d’Analabe, 30.0 km 72°ENE Daraina , 30 m, littoral rainforest, 13°05’00” S, 049°54’30” E, leg. B. L. Fisher, 27.XI.2003 GoogleMaps . Paratypes: 1 ♂, 1 ♀, CAS BLF 9429 B, same data as holotype GoogleMaps ; 1 ♂, 1 ♀, CAS BLF 10114, Province Antsiranana, Forêt d’Antsahabe , 11.4 km 275°W Daraina, 550 m, tropical dry forest, 13°12’42” S, 049°33’24” E, leg. B. L.Fisher, 12.XII.2003, general collecting GoogleMaps .

Other material examined: 4 ♂, 1 imm., FMMC, Madagascar, Prov. Antsiranana, Réserve Spéciale de Manongarivo , camp 1, 785 m, 13°58‘38“ S, 48°25‘22“ E, leg. S. M. Goodman, 28.II–6.III.1999 GoogleMaps ; 1 ♀, FMMC, same data as previous GoogleMaps ; 2 ♂, FMMC, same data as previous GoogleMaps .

Differential diagnosis: the general shape of the posterior gonopods of Colossobolus oblongopedus is similar to those of C. giganteus sp. n. The coxite branch is far shorter in C. oblongopedus than in C. giganteus sp. n. (compare Fig. 14A View Figure 14 with Fig. 15E View Figure 15 ), while the telopodite main branch is more regularly shaped in the latter than in C. oblongopedus (compare Fig. 14B View Figure 14 with Fig. 15F View Figure 15 ). The telopodite process of the anterior gonopod features a short, pointed, retrorse process in C. giganteus sp. n., which is entirely absent in C. oblongopedus (compare Fig. 13D View Figure 13 with Fig. 15D View Figure 15 ). The collum is completely red in C. oblongopedus ( Fig. 13A View Figure 13 ), while it is centrally dark in C. giganteus sp. n. ( Fig. 15A View Figure 15 ).

Description. Measurements: males with 50–52 body rings, 120–148 mm long, 10.5–11.4 mm wide. Females with 50–52 body rings, 122–125 mm long, 10.5–12.6 mm wide.

Coloration affected by alcohol. Head, collum, antennae and telson red ( Fig. 13A View Figure 13 ). Legs also red, but tarsi whitish ( Fig. 13B View Figure 13 ). Meso- and metazonites of body rings reddish, posterior margin with a thin, dark brown line. Antennae protruding back to ring

4. Male coxal processes on coxae 3 and 4 weakly developed, on coxae 5–7 barely visible ( Fig. 13B View Figure 13 ). Preanal process well-rounded, not projecting.

Anterior gonopod sternite elongated into a wide, broadly rounded lobe ( Fig. 13C View Figure 13 ). Mesal process of coxite weakly developed, protruding into a short, wide lobe with a pointed tip ( Fig. 13C View Figure 13 ). Telopodite on posterior side basally with a circular groove ( Fig. 13D View Figure 13 ). Telopodite process long and well-rounded ( Fig. 13D View Figure 13 ), mesal margin laterally sharp, slightly protruding in basal half ( Fig. 13D View Figure 13 ).

Posterior gonopods telopodites positioned parallel to one another. Coxite branch relatively short, wide, stout, less than half as long as lateral branch of telopodite ( Figs 14A, B View Figure 14 ). Latter slightly curved, basally wide, at midpoint tapering, tip again wide and swollen ( Fig. 14A View Figure 14 ). Central membranous area developed as a short, wide, well-rounded lobe ( Fig. 14A View Figure 14 ). Mesal main branch short, basal part running parallel to lateral branch. Apical part of main branch extending towards and touching lateral branch ( Fig. 14B View Figure 14 ). Mesal margin of main branch with two tiny, well-rounded, overlapping membranous folds ( Fig. 14A View Figure 14 ). Main branch laterally with a very large, irregular-shaped membrane ( Figs 14A, B View Figure 14 ).

Intraspecific variation: the specimens from the dry forest Antsahabe (52 body rings) and Manangarivo (53 body rings) are slightly larger and more voluminous than the type series specimens from the littoral forest of Analabe, which possess 50 or 51 body rings. The gonopods from both populations are almost identical.

Distribution and ecology: C. oblongopedus occurs in the dry forest of Manangarivo, around Daraina and the tiny littoral forest fragment of Analabe ( Fig. 10 View Figure 10 ). Both areas are now isolated from one another by vast areas of pseudosteppe ( Moat and Smith 2007). C. oblongopedus occurs in Analabe sympatric with C. minor sp. n., in Antsahabe together with C. semicyclus sp. n.

Etymology: oblongopedus , adjective, refers to the extraordinary long legs.


California Academy of Sciences

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